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.
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RMI STANDARD
SPECIFICATIONS
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| Materials: |
BK7, UVFS |
Angle of Incidence:
ZnSe:
Ge:
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Brewster’s Angle (ΘB)
67.4º at
10.6 µm
76.0º at
10.6 µm
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Surface Figure:
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λ/20 at 10.6 µm, both Surfaces
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Surface Quality:
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40-20 both Surfaces
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| 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 |
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Last Updated ( Friday, 27 April 2007 )
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