Category : Optics (components, coatings, instruments and systems) > Optical instrumentation, systems and accessories

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Rectangular Brewster Windows are uncoated substrates which are used in an optical system at Brewster's Angle; the angle at which p-polarized light suffers no reflection loss. The angle at which p reflectance drops to zero, termed Brewster's Angle, can be calculated from:
B = tan -1(n)
where B is Brewster's Angle and n is the index of refraction of the material. When used in a laser cavity, a Brewster Window causes the laser output to be polarized.
Fixed beam polarization is often required in order for optical components in the system to perform consistently as designed. Since many optics and coatings are polarization sensitive, a laser with a time varying polarization state can cause apparent fluctuations in system performance.
While virtually all of the p component of polarization is transmitted by a Brewster Window, most of the s component is reflected. For ZnSe, 50% of the incident s-polarized light is reflected. Ge, with a higher index of refraction, has an approximately 87% fresnel reflection of the s-polarization component at 10.6µm.

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