Brewster Window (Ellipitical Window)
Brewster window is uncoated substrate which are used as polorizer, 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 n is the refraction index of the 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: l/10 @632.8nm
Parallelism: <5 arc seconds

Protective Bevel

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