Cut Off Coatings
Trim filters, also commonly known as cut-off or dichroic filters, are advantageous for a variety of applications. Common uses include optical noise reduction for bar-code readers and wavelength band isolation for fluorescence applications. Trim filters are often used in conjunction with absorptive filter glasses to form band pass filters.
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Long Pass Trim Filter This long wave pass cutoff filter provides average reflectance more than 99% from 400-700 nm, 50% cutoff point at 750nm+/- 10 nm and 95% transmission from 780-1200 nm. Custom long wave pass filters are available on request |
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Short Pass Trim Filter This short wave pass cutoff filter passes light from 325-450 nm & blocks visible light from 500-700 nm. It has a 50% point at 470 nm +/- 10 nm. Custom short wave pass filters are available on request |
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Minus Filter This narrow band minus filter has a nominal bandwidth of 110 nm with an average reflection of more than 99% over a nominal bandwidth of 30-40 nm. The passbands have an average transmission of 90%. Custom made minus filters are available on request |
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Band Pass Filter These filter coatings transmit varying wavelength bands, which are determined by two cutoff wavelengths. Filters can be made at any given wavelength from near ultraviolet to near infrared |