{"product_id":"o01506","title":"O01506 540 nm longpass filter","description":"\u003cnav aria-label=\"Product family\"\u003e\u003cp\u003e\u003ca href=\"\/collections\/all-products\"\u003eAll optics\u003c\/a\u003e \/ \u003ca href=\"\/collections\/longpass-filters\"\u003eLongpass 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\"\u003e540 nm nominal-edge longpass filter (O01506)\u003c\/h2\u003e\n\u003cp\u003eO01506 is a longpass filter. A high-transmission region is shown at approximately 548-780 nm. Consider it when you need to pass longer wavelengths and reduce shorter-wavelength light within the measured range.\u003c\/p\u003e\n\u003ch3\u003eOptical performance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured wavelength range:\u003c\/strong\u003e 380-780 nm. Performance outside this measured interval is not established by this curve.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or above 80% transmission:\u003c\/strong\u003e 548-780 nm. Approximate measured intervals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelected regions at or below 5% transmission:\u003c\/strong\u003e 394-520 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 95.7% at 733 nm. Peak wavelength is not the same as a defined centre wavelength.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured edge at 50% transmission:\u003c\/strong\u003e Approximately 540.2 nm. Interpolated absolute-transmission crossing, checked against the factory summary. \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 machine vision:\u003c\/strong\u003e Consider a source operating inside 548-780 nm, with unwanted background on the shorter-wavelength side. Check the signal and background spectra together.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad spectral collection:\u003c\/strong\u003e Evaluate passing a range of longer wavelengths into a detector. Confirm its upper sensitivity limit because a longpass edge does not provide an upper band limit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorescence instrument development:\u003c\/strong\u003e Consider an emission-side longpass only when the excitation wavelength falls in a sufficiently attenuated region. Specify rejection at that exact wavelength and any additional blocking optics.\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\/O01506.html\" title=\"O01506 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 O01506\u003c\/h2\u003e\n\u003ch3\u003eWhat high-transmission regions should I compare for O01506?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or above 80% transmission are 548-780 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 O01506 curve as a blocking guarantee?\u003c\/h3\u003e\n\u003cp\u003eThe measured regions at or below 5% transmission are 394-520 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":"Longpass Filter \/ Green \/ Standard (\u003e20nm)","offer_id":48516677468415,"sku":"O01506","price":0.0,"currency_code":"TWD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0818\/8651\/1359\/files\/o01506-spectrum.jpg?v=1778713016","url":"https:\/\/kupooptics.com\/products\/o01506","provider":"KUPO Optics","version":"1.0","type":"link"}