High Power Thin Film Plate Polarizers
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High Power Thin Film Plate Polarizers were developed specifically for use in high power pulsed and CW 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 200:1 (for λ > 400 nm) and 100:1 (for λ < 400 nm) 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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Angle incidence:
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Brewster’s Angle (θB) |
| Materials: |
BK7, FS, UVFS, CaF2, All Glass, All Crystals |
Surface Figure:
BK7, UVFS, FS:
CaF2:
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Both surfaces:
λ/20 at 633 nm
λ/10 at 633
λ/4 at 633 nm
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Surface Quality:
BK7, UVFS, FS:
CaF2:
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Both surfaces:
10-5
20-10 |
| 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:
λ < 400 nm:
λ ≥ 400 nm:
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Rs ≥ 99%
Rs ≥ 99.5%
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Transmittance:
λ < 400 nm:
λ ≥ 400 nm:
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Tp > 90%
Tp > 95%
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Extinction Ratio:
λ < 400 nm:
λ ≥ 400 nm:
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Tp/Ts > 100:1
Tp/Ts > 200:1
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