Optical Window, Sapphire, 25.00 mm Diameter, 2.30 mm Thick

Technical Specs

  • Diameter
    25.0 mm
  • Material
    Sapphire
  • Antireflection Coating
    Uncoated
  • Surface Flatness
    2λ @ 633 nm
  • Surface Quality
    80-50 scratch-dig
  • Thickness
    2.3 mm  
  • Thickness Tolerance
    ± 0.10 mm
  • Parallelism
    ≤3.5 arc min
  • Cleaning
  • Clear Aperture
    Central 90% of diameter
  • Diameter Tolerance
    ± 0.10 mm
  • Birefringence
    0.008 for visible light orthogonal to optical axis
  • Edge Finish
    Ground and beveled
  • Surface Roughness
    0.1 µm per inch
  • Thermal Expansion Coefficient
    8.4 x 10-6 K-1
  • Thermal Limit
    22 W m-1 K-1
  • Wavelength Range
    150 to 5000 nm