Plate Beamsplitter
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Plate Beamsplitters divide an incident, monochromatic beam into reflected and transmitted components with the specified intensity ratio. The plate is coated on one side with a polarization sensitive, partial reflection coating, and on the reverse side with a high efficiency, narrowband, anti-reflection coating. |
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RMI Standard Specifications
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| Angle incidence: |
45º
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Materials:
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BK7, UVFS, FS, CaF2,
MgF2, BaF2, ZnSe, ZnS, Ge,
Si, Sapphire, Cleartran
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Surface Figure:
BK7, UVFS, FS:
CaF2, MgF2, BaF2:
ZnSe, ZnS, Ge, Si, Cleartran:
Sapphire (2 grades):
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Both surfaces
λ/20 at 633 nm
λ/4 at 633 nm
λ/40 at 10.6 µm
λ/10 at 633 nm
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Surface Quality:
BK7, UVFS, FS:
CaF2, MgF2, BaF2:
ZnSe, ZnS, Ge, Si, Cleartran:
Sapphire (2 grades):
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Both Surfaces
10-5
20-10
40-20
20-10 or 60-40
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Diameter Tolerance:
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+ 0.000", – 0.010"
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Thickness Tolerance:
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± 0.010"
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Wedge:
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≤ 3 arc minutes
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Bevels:
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0.010" – 0.030" at 45º
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Clear Aperture:
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Central 85% of diameter
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Reflectance:
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10% ≤ R ≤ 90% ± 3%
R = 90% – 95% ± 2%
R = 96% – 98% ± 1%
R > 98% ± 0.5%
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Anti -Reflection Coating:
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Unpolarized:
R ≤ 0.25% at 45° P
R ≤ 1..3% at 45° S
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