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shortpass filter set
Longpass Edge Filter Set, 25.4 mm, Includes 13 Edge Filters and Case
$1,554
Longpass Edge Filter Set, 25.4 mm, Includes 13 Edge Filters and Storage Case
In Stock
In Stock

Specifications

  • Type
    Longpass Filter Set
  • Size
    Ø25.4 mm
  • Cut-on Wavelength
    400 - 1000 nm
  • Transmission
    ≥80%
  • Effective Index of Refraction
    1.7
  • Surface Quality
    80-50 scratch-dig
  • Temperature Range
    -50 to 100°C
  • Size Tolerance
    +0/-0.5 mm
  • Wavelength Shift with Temperature
    0.025 nm/°C
  • Humidity Resistance
    Per MIL-STD-810E, Method 507.3, Procedure III Modified to 7 cycles

Features

Superior Isolation Between Stopband and Passband

Our long wave pass 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 longpass filters is OD≥3 and the stopband spans from X-ray to the edge wavelength. Typical transmission is ≥80% for our long-pass filters.

Angular Sensitivity and Fine Wavelength Tuning

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.