IR Thin Film Plate Polarizers
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IR Thin Film Plate Polarizers were developed specifically for use in high power CO2 laser applications. Designed to operate at Brewster’s Angle, they separate an incident, unpolarized, monochromatic beam into its S and P polarization components. The extinction ratio (Tp/Ts) exceeds 100:1 in the transmitted beam. Maximum efficiency is achieved by fine angular tuning of the plate about θB. These all dielectric coatings are highly sensitive to wavelength and angle of incidence.
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RMI Standard Specifications
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| Design Wavelength: |
10.6 µm |
Angle incidence:
ZnSe:
Ge:
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Brewster’s Angle (θB)
67.4° at 10.6 µm
76.0° at 10.6 µm
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| Materials: |
ZnSe, Ge |
Surface Figure:
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λ/40 at 10.6 µm, both surfaces |
Surface Quality:
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40 – 20, both surfaces |
| Diameter Tolerance: |
+ 0.000", – 0.010" |
| Thickness Tolerance: |
± 0.010" |
| Wedge: |
≤ 3 arc minutes |
| Bevels: |
0.010" – 0.030" at 45º |
| Clear Aperture: |
Central 85% of diameter |
Reflectance:
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Rs ≥ 99%
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Transmittance:
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Tp ≥ 95%
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Extinction Ratio:
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Tp/Ts ≥ 100:1
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