The FS-SWF-B Shortpass Edge Filter Set includes 12, 25.4 mm diameter, short-wave pass edge filters with 450 nm to 1000 nm cut-off wavelengths.
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FS-SWF-B-P Shortpass Filter Set, 25.4 mm, Inc. 12 Edge Filters, Storage Case | $1,730 |
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Our shortpass filters feature both high transmission within the passband, and high rejection within the stop band, as well as a rapid transition, resulting in superior spectral isolation of a desired wavelength range. Out-of-band rejection for our shortpass filters is OD≥3. The stopband spans from the edge wavelength to 1200 nm. Typical transmission is ≥65% for shortpass filters.
Unlike colored glass filters, the filter edge wavelength for thin film filters will shift to shorter wavelengths with increased AOI. This can be useful for tilt tuning these shortpass filters to your exact wavelength. The shift may be calculated by: λθ = λo [1-(no/ne)2 sin2θ]1/2 where λθ is the wavelength at the new angle of incidence; λo is the center wavelength; no is the index of refraction of the environment (no = 1 in air); ne is the effective index of refraction of the filter; and θ is the angle of incidence. This property can be beneficial as the filters may be intentionally tilted to either stop or allow transmission of light from lasers or light sources near the edge wavelength. Our visible and IR filters have a particularly high ne, allowing more precise wavelength tuning.
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