{"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","url":"https:\/\/kupooptics.com\/products\/bbp-850d","provider":"KUPO Optics","version":"1.0","type":"link"}