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Optical windows are used to allow optical radiation to pass from one environment to another without allowing other elements of these environments to mix.

And it does not change the wavelength distribution of the beam, the transmitted wavefront, nor does it scatter any of the light out of the beam.

 

Key Features

Material: BK7 / CaF2 / Fused Silica / MgF2 / Sapphire / ZnSe

Irregularity (fringe): l /4

Diameter Tolerance: +0.0, -0.05mm

Thickness Tolerance: +/- 0.1mm

Clear Aperture: >85%

Parallelism: 5 arc min

Surface Quality: 40-20

Wavefront Distortion: l/4 per 25mm