Brewster Windows are uncoated substrates used as polarizers, typically within a laser cavity. Positioned at Brewster's Angle (see calculation below) 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 polarizer.
Brewster's Angle is calculated from:
B = tan-1(n)
where B is Brewster's Angle and n is the index of refraction of the material.
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