Longpass Filters

Longpass Filters

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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All Longpass Filters products (108)