1. Products
  2. Optics
  3. Optical Filters
  4. Color and Absorptive Optical Filters
  5. Colored Glass Absorptive Longpass Filters
  6. FSR-RG645

Longpass Filter, Colored Glass, 25.4 mm, 645 nm Cut-on, RG645 Glass

  • Type
    Colored Glass Longpass Filter
  • Optic Size
    Ø25.4 mm
  • Cut-on Wavelength
    645 nm
  • Angle of Incidence
    0°
  • Material
    Schott RG645 or equivalent
  • Thickness Tolerance
    ±0.1 mm
  • Surface Flatness
    ≤1λ at 632.8 nm over the clear aperture
  • Surface Quality
    60-40 scratch-dig
  • Thickness
    2.0 to 3.0 mm, typical
  • Size Tolerance
    ±0.3 mm
  • Clear Aperture
    central ≥ 80% of diameter
  • Damage Threshold
    30 W/cm2 CW, Typical
  • Wedge
    ≤3 arc min
  • Chamfers
    Up to 1 mm face width
  • Cleaning
    See How to Clean Optics
  • Chamfers Angle Tolerance
    45° ±15°
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