Surface quality: 60-40 scratch & dig
Clear aperture:90% of the diameter
Diameter tolerance: +0.00 / -0.15 mm
Thickness tolerance: +/-0.20 mm
Flatness 2λ per inch@ 633 nm
Windows are used to allow optical radiation to pass from one environment to another without allowing other components of these environments to mix. Considerations in selecting windows may include transmission, scattering, wavefront distortion and resistance to certain environments.