Longpass filters transmit wavelengths above a cut-on wavelength and block shorter wavelengths. They remove excitation light in fluorescence and Raman detection, or block visible light in front of NIR detectors.
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Key specifications
- Cut-on wavelengths across the UV, visible and NIR
- Transmission > 90 % above the cut-on; deep rejection below
- Ø12.5, 25 and 50 mm, unmounted; 2–5 mm thick
How to choose
Choose a cut-on a little above the wavelength you need to block, so the blocking edge sits clear of the laser line.
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