{"title":"Bandpass Filters","description":"\u003cp\u003eSelect a defined wavelength band while reducing light on either side. Compare nominal wavelength, the full transmission curve and bandwidth to choose a starting design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow to choose:\u003c\/strong\u003e Match the source bandwidth and detector response, then confirm blocking and the working angle. A nominal wavelength or measured peak alone does not define the passband.\u003c\/p\u003e","products":[{"product_id":"bbp-940w3","title":"BBP-940W3 940 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e940 nm nominal-channel bandpass filter (BBP-940W3)\u003c\/h2\u003e\n\u003cp\u003eBBP-940W3 is a bandpass filter. The main high-transmission region is approximately 920-976 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 905.1-990 nm, giving a full width at half maximum (FWHM) of approximately 84.9 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 920-976 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-371 nm; 381-770 nm; 780-881 nm; 1017-1200 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 90.2% at 938 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 400-860 nm:\u003c\/strong\u003e 1.838%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 921-959 nm:\u003c\/strong\u003e 88.868%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 1000-1100 nm:\u003c\/strong\u003e 3.029%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e940 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 940 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP940-D04; earlier reference BBP-940W3. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-940W3.html\" title=\"BBP-940W3 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-940W3\u003c\/h2\u003e\n\u003ch3\u003eWhat high-transmission regions should I compare for BBP-940W3?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 920-976 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCan I use the low points on the BBP-940W3 curve as a blocking guarantee?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or below 5% transmission are 300-371 nm; 381-770 nm; 780-881 nm; 1017-1200 nm. That threshold is a way to summarize this sample, not a guaranteed blocking specification. For a weak signal beside a bright unwanted wavelength, tell us the actual wavelengths and maximum leakage you can accept.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Standard (41-80nm FWHM)","offer_id":48516669538559,"sku":"BBP-940W3","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-940w3-spectrum.jpg?v=1778712911"},{"product_id":"bbp-470a","title":"BBP-470A 470 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-bbp470a-description-title\"\u003e470 nm nominal-channel bandpass filter (BBP-470A)\u003c\/h2\u003e\n\u003cp\u003eBBP-470A is a bandpass filter. The main high-transmission region is approximately 459-490 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 454.4-495.8 nm, giving a full width at half maximum (FWHM) of approximately 41.4 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 459-490 nm; 1179-1185 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-447 nm; 503-1150 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 90.5% at 477 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 300-440 nm:\u003c\/strong\u003e 0.685%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 460-480 nm:\u003c\/strong\u003e 89.375%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 500-1100 nm:\u003c\/strong\u003e 0.868%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e488 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 488 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdditional regions reach at least 50% transmission at approximately 1173-1194 nm. Include these in the detector and blocking assessment.\u003c\/li\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP470-D01; earlier reference BBP-470A. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-470A.html\" title=\"BBP-470A transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-470A\u003c\/h2\u003e\n\u003ch3\u003eWhich part of the spectrum is most useful when choosing BBP-470A?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 459-490 nm; 1179-1185 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eWhat should I check beyond the main transmission region of BBP-470A?\u003c\/h3\u003e\n\u003cp\u003eFor BBP-470A, additional regions reach at least 50% transmission at approximately 1173-1194 nm. If your detector responds there, include that light in the background assessment or discuss an additional blocking requirement.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-bbp470a-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-bbp470a-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-bbp470a-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Blue \/ Standard (41-80nm FWHM)","offer_id":48516669571327,"sku":"BBP-470A","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-470a-spectrum.jpg?v=1778712912"},{"product_id":"bbp-940w2","title":"BBP-940W2 940 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e940 nm nominal-channel bandpass filter (BBP-940W2)\u003c\/h2\u003e\n\u003cp\u003eBBP-940W2 is a bandpass filter. The main high-transmission region is approximately 920-987 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 912.7-993.9 nm, giving a full width at half maximum (FWHM) of approximately 81.2 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 920-987 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-895 nm; 1010-1200 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 98.6% at 954 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 400-880 nm:\u003c\/strong\u003e 0.629%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 930-960 nm:\u003c\/strong\u003e 98.027%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 1020-1150 nm:\u003c\/strong\u003e 0.167%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e940 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 940 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP940-D03; earlier reference BBP-940W2. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-940W2.html\" title=\"BBP-940W2 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-940W2\u003c\/h2\u003e\n\u003ch3\u003eWhich part of the spectrum is most useful when choosing BBP-940W2?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 920-987 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eWhich low-transmission regions are shown for BBP-940W2?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or below 5% transmission are 300-895 nm; 1010-1200 nm. That threshold is a way to summarize this sample, not a guaranteed blocking specification. For a weak signal beside a bright unwanted wavelength, tell us the actual wavelengths and maximum leakage you can accept.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Standard (41-80nm FWHM)","offer_id":48516669604095,"sku":"BBP-940W2","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-940w2-spectrum.jpg?v=1778712913"},{"product_id":"bbp-940","title":"BBP-940 940 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e940 nm nominal-channel bandpass filter (BBP-940)\u003c\/h2\u003e\n\u003cp\u003eBBP-940 is a bandpass filter. The main high-transmission region is approximately 931-958 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 924.8-963.6 nm, giving a full width at half maximum (FWHM) of approximately 38.8 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 931-958 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-911 nm; 975-1200 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 97.9% at 940 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 400-910 nm:\u003c\/strong\u003e 0.250%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 936-948 nm:\u003c\/strong\u003e 97.415%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 1000-1200 nm:\u003c\/strong\u003e 0.130%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e940 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 940 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP940-D01; earlier reference BBP-940. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-940.html\" title=\"BBP-940 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-940\u003c\/h2\u003e\n\u003ch3\u003eWhat high-transmission regions should I compare for BBP-940?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 931-958 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCan I use the low points on the BBP-940 curve as a blocking guarantee?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or below 5% transmission are 300-911 nm; 975-1200 nm. That threshold is a way to summarize this sample, not a guaranteed blocking specification. For a weak signal beside a bright unwanted wavelength, tell us the actual wavelengths and maximum leakage you can accept.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Narrowband (\u003c=40nm FWHM)","offer_id":48516669636863,"sku":"BBP-940","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-940-spectrum.jpg?v=1778712914"},{"product_id":"bbp-905","title":"BBP-905 905 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e905 nm nominal-channel bandpass filter (BBP-905)\u003c\/h2\u003e\n\u003cp\u003eBBP-905 is a bandpass filter. The main high-transmission region is approximately 874-928 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 867.2-935.7 nm, giving a full width at half maximum (FWHM) of approximately 68.5 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 874-928 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-854 nm; 953-1072 nm; 1076-1139 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 94.5% at 885 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 300-845 nm:\u003c\/strong\u003e 0.998%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 885-925 nm:\u003c\/strong\u003e 92.758%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 965-1000 nm:\u003c\/strong\u003e 0.593%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e905 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 905 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP905-D01; earlier reference BBP-905. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-905.html\" title=\"BBP-905 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-905\u003c\/h2\u003e\n\u003ch3\u003eWhich part of the spectrum is most useful when choosing BBP-905?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 874-928 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eWhich low-transmission regions are shown for BBP-905?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or below 5% transmission are 300-854 nm; 953-1072 nm; 1076-1139 nm. That threshold is a way to summarize this sample, not a guaranteed blocking specification. For a weak signal beside a bright unwanted wavelength, tell us the actual wavelengths and maximum leakage you can accept.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Standard (41-80nm FWHM)","offer_id":48516669669631,"sku":"BBP-905","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-905-spectrum.jpg?v=1778712915"},{"product_id":"bbp-850d","title":"BBP-850D 850 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e850 nm nominal-channel bandpass filter (BBP-850D)\u003c\/h2\u003e\n\u003cp\u003eBBP-850D is a bandpass filter. The main high-transmission region is approximately 846-857 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 842.8-861 nm, giving a full width at half maximum (FWHM) of approximately 18.2 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 846-857 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-837 nm; 868-1138 nm; 1169-1200 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 93.7% at 853 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 400-835 nm:\u003c\/strong\u003e 0.210%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 845-855 nm:\u003c\/strong\u003e 89.479%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 865-1100 nm:\u003c\/strong\u003e 0.253%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e850 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 850 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdditional regions reach at least 50% transmission at approximately 1149-1153 nm. Include these in the detector and blocking assessment.\u003c\/li\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP850-D04; earlier reference BBP-850D. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-850D.html\" title=\"BBP-850D transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-850D\u003c\/h2\u003e\n\u003ch3\u003eWhere does BBP-850D transmit at least 80% in the measured curve?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 846-857 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCould BBP-850D pass light outside its main band?\u003c\/h3\u003e\n\u003cp\u003eFor BBP-850D, additional regions reach at least 50% transmission at approximately 1149-1153 nm. If your detector responds there, include that light in the background assessment or discuss an additional blocking requirement.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Narrowband (\u003c=40nm FWHM)","offer_id":48516669702399,"sku":"BBP-850D","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-850d-spectrum.jpg?v=1778712916"},{"product_id":"bbp-850c","title":"BBP-850C 850 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e850 nm nominal-channel bandpass filter (BBP-850C)\u003c\/h2\u003e\n\u003cp\u003eBBP-850C is a bandpass filter. The main high-transmission region is approximately 827-896 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 821.2-901.7 nm, giving a full width at half maximum (FWHM) of approximately 80.4 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 827-896 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-808 nm; 917-1200 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 99.7% at 879 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 400-790 nm:\u003c\/strong\u003e 0.511%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 840-870 nm:\u003c\/strong\u003e 98.260%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 930-1150 nm:\u003c\/strong\u003e 0.357%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e850 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 850 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP850-D03; earlier reference BBP-850C. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-850C.html\" title=\"BBP-850C transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-850C\u003c\/h2\u003e\n\u003ch3\u003eWhat high-transmission regions should I compare for BBP-850C?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 827-896 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCan I use the low points on the BBP-850C curve as a blocking guarantee?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or below 5% transmission are 300-808 nm; 917-1200 nm. That threshold is a way to summarize this sample, not a guaranteed blocking specification. For a weak signal beside a bright unwanted wavelength, tell us the actual wavelengths and maximum leakage you can accept.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Standard (41-80nm FWHM)","offer_id":48516669735167,"sku":"BBP-850C","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-850c-spectrum.jpg?v=1778712917"},{"product_id":"bbp-765","title":"BBP-765 765 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e765 nm nominal-channel bandpass filter (BBP-765)\u003c\/h2\u003e\n\u003cp\u003eBBP-765 is a bandpass filter. The main high-transmission region is approximately 742-799 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 735.5-806.1 nm, giving a full width at half maximum (FWHM) of approximately 70.6 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 742-799 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-719 nm; 825-1118 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 98.9% at 774 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 300-700 nm:\u003c\/strong\u003e 0.753%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 745-780 nm:\u003c\/strong\u003e 97.611%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 830-1100 nm:\u003c\/strong\u003e 0.729%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e780 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 780 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdditional regions reach at least 50% transmission at approximately 1164-1200 nm. Include these in the detector and blocking assessment.\u003c\/li\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP765-D01; earlier reference BBP-765. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-765.html\" title=\"BBP-765 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-765\u003c\/h2\u003e\n\u003ch3\u003eWhich part of the spectrum is most useful when choosing BBP-765?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 742-799 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eWhat should I check beyond the main transmission region of BBP-765?\u003c\/h3\u003e\n\u003cp\u003eFor BBP-765, additional regions reach at least 50% transmission at approximately 1164-1200 nm. If your detector responds there, include that light in the background assessment or discuss an additional blocking requirement.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Standard (41-80nm FWHM)","offer_id":48516669767935,"sku":"BBP-765","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-765-spectrum.jpg?v=1778712918"},{"product_id":"bbp-730","title":"BBP-730 730 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e730 nm nominal-channel bandpass filter (BBP-730)\u003c\/h2\u003e\n\u003cp\u003eBBP-730 is a bandpass filter. The main high-transmission region is approximately 691-765 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 686.5-769.8 nm, giving a full width at half maximum (FWHM) of approximately 83.3 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 691-765 nm; 1138-1140 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-373 nm; 382-671 nm; 785-1116 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 99% at 716 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 400-650 nm:\u003c\/strong\u003e 0.313%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 710-750 nm:\u003c\/strong\u003e 98.533%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 820-1100 nm:\u003c\/strong\u003e 0.650%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIlluminated inspection:\u003c\/strong\u003e Consider illumination within 691-765 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdditional regions reach at least 50% transmission at approximately 1133-1148 nm. Include these in the detector and blocking assessment.\u003c\/li\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP730-D01; earlier reference BBP-730. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-730.html\" title=\"BBP-730 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-730\u003c\/h2\u003e\n\u003ch3\u003eWhere does BBP-730 transmit at least 80% in the measured curve?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 691-765 nm; 1138-1140 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCould BBP-730 pass light outside its main band?\u003c\/h3\u003e\n\u003cp\u003eFor BBP-730, additional regions reach at least 50% transmission at approximately 1133-1148 nm. If your detector responds there, include that light in the background assessment or discuss an additional blocking requirement.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Standard (41-80nm FWHM)","offer_id":48516669800703,"sku":"BBP-730","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-730-spectrum.jpg?v=1778712918"},{"product_id":"bbp-680","title":"BBP-680 680 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e680 nm nominal-channel bandpass filter (BBP-680)\u003c\/h2\u003e\n\u003cp\u003eBBP-680 is a bandpass filter. The main high-transmission region is approximately 657-719 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 651.4-726.5 nm, giving a full width at half maximum (FWHM) of approximately 75.1 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 657-719 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-378 nm; 390-642 nm; 737-1200 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 96.5% at 674 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 420-620 nm:\u003c\/strong\u003e 0.780%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 670-700 nm:\u003c\/strong\u003e 95.227%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 760-1150 nm:\u003c\/strong\u003e 0.490%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e660 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 660 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP680-D01; earlier reference BBP-680. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-680.html\" title=\"BBP-680 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-680\u003c\/h2\u003e\n\u003ch3\u003eWhat high-transmission regions should I compare for BBP-680?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 657-719 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCan I use the low points on the BBP-680 curve as a blocking guarantee?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or below 5% transmission are 300-378 nm; 390-642 nm; 737-1200 nm. That threshold is a way to summarize this sample, not a guaranteed blocking specification. For a weak signal beside a bright unwanted wavelength, tell us the actual wavelengths and maximum leakage you can accept.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Red \/ Standard (41-80nm FWHM)","offer_id":48516669833471,"sku":"BBP-680","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-680-spectrum.jpg?v=1778712919"},{"product_id":"bbp-585","title":"BBP-585 585 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e585 nm nominal-channel bandpass filter (BBP-585)\u003c\/h2\u003e\n\u003cp\u003eBBP-585 is a bandpass filter. The main high-transmission region is approximately 579-595 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-800 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 573.2-599.5 nm, giving a full width at half maximum (FWHM) of approximately 26.3 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 579-595 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-362 nm; 401-563 nm; 608-800 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 93% at 585 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 400-550 nm:\u003c\/strong\u003e 0.752%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 580-590 nm:\u003c\/strong\u003e 91.898%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 620-800 nm:\u003c\/strong\u003e 0.542%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIlluminated inspection:\u003c\/strong\u003e Consider illumination within 579-595 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP585-D01; earlier reference BBP-585. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-585.html\" title=\"BBP-585 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-585\u003c\/h2\u003e\n\u003ch3\u003eWhat high-transmission regions should I compare for BBP-585?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 579-595 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCan I use the low points on the BBP-585 curve as a blocking guarantee?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or below 5% transmission are 300-362 nm; 401-563 nm; 608-800 nm. That threshold is a way to summarize this sample, not a guaranteed blocking specification. For a weak signal beside a bright unwanted wavelength, tell us the actual wavelengths and maximum leakage you can accept.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Yellow-Orange \/ Narrowband (\u003c=40nm FWHM)","offer_id":48516669866239,"sku":"BBP-585","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-585-spectrum.jpg?v=1778712920"},{"product_id":"bbp-485","title":"BBP-485 485 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e485 nm nominal-channel bandpass filter (BBP-485)\u003c\/h2\u003e\n\u003cp\u003eBBP-485 is a bandpass filter. The main high-transmission region is approximately 477-495 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-800 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 471.9-500 nm, giving a full width at half maximum (FWHM) of approximately 28.1 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 477-495 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-464 nm; 506-727 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 90.6% at 487 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 300-460 nm:\u003c\/strong\u003e 0.176%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 480-490 nm:\u003c\/strong\u003e 90.148%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 500-700 nm:\u003c\/strong\u003e 0.875%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e488 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 488 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdditional regions reach at least 50% transmission at approximately 737-741 nm. Include these in the detector and blocking assessment.\u003c\/li\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP485-D01; earlier reference BBP-485. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-485.html\" title=\"BBP-485 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-485\u003c\/h2\u003e\n\u003ch3\u003eWhat high-transmission regions should I compare for BBP-485?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 477-495 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCould a broad-response detector see another band through BBP-485?\u003c\/h3\u003e\n\u003cp\u003eFor BBP-485, additional regions reach at least 50% transmission at approximately 737-741 nm. If your detector responds there, include that light in the background assessment or discuss an additional blocking requirement.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Blue \/ Narrowband (\u003c=40nm FWHM)","offer_id":48516669931775,"sku":"BBP-485","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-485-spectrum.jpg?v=1778712922"},{"product_id":"bbp-525","title":"BBP-525 525 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e525 nm nominal-channel bandpass filter (BBP-525)\u003c\/h2\u003e\n\u003cp\u003eBBP-525 is a bandpass filter. The main high-transmission region is approximately 484-565 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 474.4-574.4 nm, giving a full width at half maximum (FWHM) of approximately 99.9 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 484-565 nm; 1180-1200 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-448 nm; 634-680 nm; 694-752 nm; 843-955 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 94.7% at 551 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 350-440 nm:\u003c\/strong\u003e 1.430%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 500-550 nm:\u003c\/strong\u003e 94.360%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 630-1100 nm:\u003c\/strong\u003e 4.119%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e532 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 532 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdditional regions reach at least 50% transmission at approximately 1169-1200 nm. Include these in the detector and blocking assessment.\u003c\/li\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP525-D01; earlier reference BBP-525. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-525.html\" title=\"BBP-525 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-525\u003c\/h2\u003e\n\u003ch3\u003eWhere does BBP-525 transmit at least 80% in the measured curve?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 484-565 nm; 1180-1200 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCould BBP-525 pass light outside its main band?\u003c\/h3\u003e\n\u003cp\u003eFor BBP-525, additional regions reach at least 50% transmission at approximately 1169-1200 nm. If your detector responds there, include that light in the background assessment or discuss an additional blocking requirement.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Green \/ Wideband (\u003e80nm FWHM)","offer_id":48516669997311,"sku":"BBP-525","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-525-spectrum.jpg?v=1778712923"},{"product_id":"bbp-850b","title":"BBP-850B 850 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e850 nm nominal-channel bandpass filter (BBP-850B)\u003c\/h2\u003e\n\u003cp\u003eBBP-850B is a bandpass filter. The main high-transmission region is approximately 817-875 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 810.8-884.4 nm, giving a full width at half maximum (FWHM) of approximately 73.6 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 817-875 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-797 nm; 903-1131 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 97.3% at 841 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 400-760 nm:\u003c\/strong\u003e 0.435%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 840-860 nm:\u003c\/strong\u003e 96.690%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 900-1100 nm:\u003c\/strong\u003e 0.754%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e850 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 850 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP850-D02; earlier reference BBP-850B. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-850B.html\" title=\"BBP-850B transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-850B\u003c\/h2\u003e\n\u003ch3\u003eWhich part of the spectrum is most useful when choosing BBP-850B?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 817-875 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eWhich low-transmission regions are shown for BBP-850B?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or below 5% transmission are 300-797 nm; 903-1131 nm. That threshold is a way to summarize this sample, not a guaranteed blocking specification. For a weak signal beside a bright unwanted wavelength, tell us the actual wavelengths and maximum leakage you can accept.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Standard (41-80nm FWHM)","offer_id":48516670030079,"sku":"BBP-850B","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-850b-spectrum.jpg?v=1778712924"},{"product_id":"bbp-940w1","title":"BBP-940W1 940 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e940 nm nominal-channel bandpass filter (BBP-940W1)\u003c\/h2\u003e\n\u003cp\u003eBBP-940W1 is a bandpass filter. The main high-transmission region is approximately 903-984 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 887.9-998.5 nm, giving a full width at half maximum (FWHM) of approximately 110.6 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 903-984 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-371 nm; 392-847 nm; 1028-1133 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 93.2% at 924 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 400-830 nm:\u003c\/strong\u003e 0.782%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 930-950 nm:\u003c\/strong\u003e 92.542%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 1050-1100 nm:\u003c\/strong\u003e 1.016%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e940 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 940 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdditional regions reach at least 50% transmission at approximately 1162-1177 nm. Include these in the detector and blocking assessment.\u003c\/li\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP940-D02; earlier reference BBP-940W1. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-940W1.html\" title=\"BBP-940W1 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-940W1\u003c\/h2\u003e\n\u003ch3\u003eWhere does BBP-940W1 transmit at least 80% in the measured curve?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 903-984 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCould BBP-940W1 pass light outside its main band?\u003c\/h3\u003e\n\u003cp\u003eFor BBP-940W1, additional regions reach at least 50% transmission at approximately 1162-1177 nm. If your detector responds there, include that light in the background assessment or discuss an additional blocking requirement.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Wideband (\u003e80nm FWHM)","offer_id":48516670062847,"sku":"BBP-940W1","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-940w1-spectrum.jpg?v=1778712925"},{"product_id":"bbp-783","title":"BBP-783 783 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e783 nm nominal-channel bandpass filter (BBP-783)\u003c\/h2\u003e\n\u003cp\u003eBBP-783 is a bandpass filter. The main high-transmission region is approximately 778-799 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 772-808.4 nm, giving a full width at half maximum (FWHM) of approximately 36.5 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 778-799 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-379 nm; 403-411 nm; 415-761 nm; 822-1115 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 91.7% at 790 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 400-740 nm:\u003c\/strong\u003e 0.612%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 820-1100 nm:\u003c\/strong\u003e 1.194%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e780 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 780 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdditional regions reach at least 50% transmission at approximately 1145-1176 nm. Include these in the detector and blocking assessment.\u003c\/li\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP783-D01; earlier reference BBP-783. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-783.html\" title=\"BBP-783 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-783\u003c\/h2\u003e\n\u003ch3\u003eWhat high-transmission regions should I compare for BBP-783?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 778-799 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCould a broad-response detector see another band through BBP-783?\u003c\/h3\u003e\n\u003cp\u003eFor BBP-783, additional regions reach at least 50% transmission at approximately 1145-1176 nm. If your detector responds there, include that light in the background assessment or discuss an additional blocking requirement.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Narrowband (\u003c=40nm FWHM)","offer_id":48516670128383,"sku":"BBP-783","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-783-spectrum.jpg?v=1778712926"},{"product_id":"bbp-850a","title":"BBP-850A 850 nm bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003e850 nm nominal-channel bandpass filter (BBP-850A)\u003c\/h2\u003e\n\u003cp\u003eBBP-850A is a bandpass filter. The main high-transmission region is approximately 804-886 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 795.5-893.9 nm, giving a full width at half maximum (FWHM) of approximately 98.4 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 804-886 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-777 nm; 911-1125 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 95.6% at 840 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 300-780 nm:\u003c\/strong\u003e 0.740%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 820-880 nm:\u003c\/strong\u003e 94.838%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage measured transmission, 920-1100 nm:\u003c\/strong\u003e 0.495%. Calculated from the factory sample data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e850 nm illuminated inspection:\u003c\/strong\u003e Consider a source around 850 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAdditional regions reach at least 50% transmission at approximately 1192-1200 nm. Include these in the detector and blocking assessment.\u003c\/li\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003cstrong\u003eCatalog cross-reference:\u003c\/strong\u003e BP850-D01; earlier reference BBP-850A. Include either reference in your inquiry.\u003c\/p\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BBP-850A.html\" title=\"BBP-850A transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BBP-850A\u003c\/h2\u003e\n\u003ch3\u003eWhere does BBP-850A transmit at least 80% in the measured curve?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 804-886 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCould BBP-850A pass light outside its main band?\u003c\/h3\u003e\n\u003cp\u003eFor BBP-850A, additional regions reach at least 50% transmission at approximately 1192-1200 nm. If your detector responds there, include that light in the background assessment or discuss an additional blocking requirement.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Wideband (\u003e80nm FWHM)","offer_id":48516670193919,"sku":"BBP-850A","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bbp-850a-spectrum.jpg?v=1778712927"},{"product_id":"bh-a17","title":"BH-A17 Bandpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/bandpass-filters\"\u003eBandpass Filters\u003c\/a\u003e\u003c\/p\u003e\u003c\/nav\u003e\u003cstyle\u003e\n.ko-reviewed{color:#222;font-family:inherit;line-height:1.65;overflow-wrap:anywhere}\n.ko-reviewed *{box-sizing:border-box}.ko-reviewed h2,.ko-reviewed h3{color:#005F96;line-height:1.3}\n.ko-reviewed h2{font-size:24px;margin:0 0 1rem}.ko-reviewed h3{font-size:19px;margin:1.7rem 0 .65rem}\n.ko-reviewed p{margin:.6rem 0 1rem}.ko-reviewed ul{padding-left:1.25rem;margin:.6rem 0 1rem}\n.ko-reviewed li{padding-left:.15rem;margin:.55rem 0}.ko-reviewed .ko-note{border-left:3px solid #c9dae4;padding:.65rem 1rem;background:#f7fafc;font-size:.95em}\n.ko-reviewed a{color:#005F96;text-decoration:underline}\n\n@media(max-width:480px){.ko-reviewed h2{font-size:22px}.ko-reviewed h3{font-size:18px}.ko-reviewed .ko-note{padding:.65rem .8rem}}\n\u003c\/style\u003e\u003csection class=\"ko-reviewed\"\u003e\u003ch2 class=\"ko-catalog-description-title\"\u003eBandpass filter (BH-A17)\u003c\/h2\u003e\n\u003cp\u003eBH-A17 is a bandpass filter. The main high-transmission region is approximately 815-842 nm. Use the full curve to match the desired signal and check secondary transmission before choosing the filter.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 300-1200 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain band at half-peak transmission:\u003c\/strong\u003e Approximately 804.8-852.7 nm, giving a full width at half maximum (FWHM) of approximately 48 nm. This describes the main band only; other transmitted regions may remain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 815-842 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 300-391 nm; 406-787 nm; 873-1133 nm; 1148-1186 nm. Measured sample intervals; confirm the required blocking for your order.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePeak transmission:\u003c\/strong\u003e Approximately 94.1% at 828 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e We can customize stock and sample-book designs. Tell us the wavelength response, size and operating conditions you need.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ko-note\"\u003eThese values come from the measured samples and help you choose a starting design. We will agree the final specification for your order. Custom versions have their own specifications and measured curves.\u003c\/p\u003e\n\u003ch3\u003eApplications to consider\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIlluminated inspection:\u003c\/strong\u003e Consider illumination within 815-842 nm. Match the full source bandwidth to the curve, and check ambient-light rejection over the detector response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptical sensing channels:\u003c\/strong\u003e Evaluate the transmitted region for a source-and-detector pair. Secondary transmitted light may require additional blocking or a detector with a limited response.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider the profile for an excitation or collection channel after matching both spectra. Confirm rejection of the excitation line and other transmitted bands in the complete optical layout.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eChoosing this filter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCheck the full wavelength range of your light source, the wavelengths your detector responds to, and how much unwanted light you need to block. Use the full curve when choosing a filter; the product code and peak do not tell the whole story.\u003c\/li\u003e\n\u003cli\u003eTell us the angle at which light reaches the filter and whether the beam is parallel or converging. For demanding rejection or high-power use, confirm the required blocking and power-handling specifications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCustom options\u003c\/h3\u003e\n\u003cp\u003eStart with this stock or sample-book design, then tell us what you need to change. We can discuss the wavelength bands, transmission, blocking, angle, glass material, size and operating conditions with you, and agree a specification for your custom filter.\u003c\/p\u003e\u003c\/section\u003e\u003ch3\u003eTransmission spectrum\u003c\/h3\u003e\u003ciframe src=\"https:\/\/charts.kupooptics.com\/BH-A17.html\" title=\"BH-A17 transmission spectrum with wavelength readout\" loading=\"lazy\" width=\"100%\" height=\"880\" style=\"border:0;width:100%;height:clamp(640px,calc(43vw + 320px),880px);\" referrerpolicy=\"no-referrer-when-downgrade\"\u003e\u003c\/iframe\u003e\u003csection class=\"ko-reviewed ko-product-faq\" aria-label=\"Product questions\"\u003e\u003ch2\u003eQuestions about BH-A17\u003c\/h2\u003e\n\u003ch3\u003eWhat high-transmission regions should I compare for BH-A17?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 815-842 nm. They are measured intervals, not guaranteed passband tolerances. Compare the full curve with the signal wavelengths you need to retain.\u003c\/p\u003e\n\u003ch3\u003eCan I use the low points on the BH-A17 curve as a blocking guarantee?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or below 5% transmission are 300-391 nm; 406-787 nm; 873-1133 nm; 1148-1186 nm. That threshold is a way to summarize this sample, not a guaranteed blocking specification. For a weak signal beside a bright unwanted wavelength, tell us the actual wavelengths and maximum leakage you can accept.\u003c\/p\u003e\u003c\/section\u003e\u003cp\u003e\u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eDiscuss this filter with KUPO\u003c\/strong\u003e\u003c\/a\u003e - include the product reference, source wavelength, working angle and required dimensions.\u003c\/p\u003e\u003cstyle\u003e#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:27px;font-weight:500;line-height:1.4;letter-spacing:-.01em;color:#0c324b;background:#f0f6f9;padding:20px 24px;}#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title+p{border-bottom:0;}@media(max-width:650px){#MainContent .ko-reviewed\u003eh2.ko-catalog-description-title{font-size:24px;}}\u003c\/style\u003e","brand":"KUPO Optics","offers":[{"title":"Bandpass Filter \/ Near-Infrared \/ Standard (41-80nm FWHM)","offer_id":48516671144191,"sku":"BH-A17","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/bh-a17-spectrum.jpg?v=1778712946"}],"url":"https:\/\/kupooptics.com\/collections\/bandpass-filters.oembed","provider":"KUPO Optics","version":"1.0","type":"link"}