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IR Brewster Windows Print E-mail

IR Brewster Windows


Brewster Windows are primarily used in laser cavities to produce a beam with a high degree of polarization purity. When unpolarized light is incident on an uncoated substrate at Brewster’s Angle, the reflected portion is completely S polarized and the transmitted portion is partially P polarized. Multiple passes through the substrate substantially reduces the S component in the transmitted beam, resulting in a highly P polarized output. Multi-layer Thin Film Polarizer coatings can be applied to these substrates to greatly improve efficiency and extinction ratio on a single pass through the substrate.

 

RMI STANDARD SPECIFICATIONS
Materials: BK7, UVFS
Angle of Incidence:
ZnSe:
Ge:
 Brewster’s Angle (ΘB)
67.4º at 10.6 µm
76.0º at 10.6 µm
Surface Figure:
 λ/20 at 10.6 µm, both Surfaces
Surface Quality:
 40-20 both Surfaces
Diminsional Tolerance: + 0.000", – 0.010"
Thickness Tolerance: ± 0.010"
Wedge:
 ≤ 1 arc minute
Bevels: 0.010" - 0.030" at 45º
Clear Aperture: Central 85% of diameter
IR Brewster Windows
Applicable Coatings Quick Links
Infrared Coatings
    Narrowband Anti-Reflection (NAR)
    Thin Film Plate Polarizer (TFP)

Last Updated ( Friday, 27 April 2007 )
 
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