Compare Model Drawings, CAD & Specs Availability Price
Silicon Window, 25.4 mm Diameter, 2.0 mm Thick, Uncoated
In Stock
In Stock


  • Diameter
    25.4 mm
  • Material
    Optical Grade Silicon
  • Antireflection Coating
  • Surface Flatness
    λ/20 @ 10.6 µm
  • Surface Quality
    40-20 scratch-dig
  • Thickness
    2.0 mm
  • Thickness Tolerance
    ±0.25 mm
  • Parallelism
    < 3 arc minute
  • Cleaning
  • Clear Aperture
    Central 85% of diameter
  • Diameter Tolerance
    ±0.20 mm


Ideal for Weight-Sensitive Applications

With a low 2.329 g/cm3 density, silicon windows are an ideal choice for weight-sensitive applications. Additionally, silicon is less brittle and more thermally stable than germanium and zinc selenide.

No Birefringence

Birefringence can degrade IR imaging performance, so selecting a material that is not birefringent is important. Since silicon features a cubic crystalline structure, it will not exhibit birefringence.