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The window cutted as brewster angle, It's used as polarizer in laser cavity.
Brewster Windows are uncoated substrates which are used as polorizers, typically within a laser cavity. Positioned at Brewster's Angle the P-Polarization portion of the light will pass through the window with no losses while the S Polarization portion will be reflected off the brewster window. Used in a laser cavity the brewster window is essentially a polorizer.
Brewster's Angle is calculated from:
where θ is Brewster's Angle and n is the refraction index of the material.
Material: BK7 or Fused silica
Diameter Tolerance: +0.0, -0.1mm
Thickness Tolerance: ± 0.2mm
Clear Aperture: >85%
Surface Quality: 10-5 scratch and dig
Wavefront transmission: λ/10 @632.8nm
Parallelism: <5 arc seconds