Broadband Cube Beamsplitter
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Broadband Cube Beamsplitters are formed from two right angle, 45° prisms permanently cemented together. The hypotenuse is coated with a combination metallic and dielectric, partial reflection coating. An incident, polychromatic beam is divided into reflected and transmitted components with a ratio (R/T) of 45/45 ± 5%. All entrance and exit surfaces are coated with a high efficiency, broadband, anti-reflection coating.
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RMI Standard Specifications
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Angle incidence:
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0º |
| Angle of Reflectance: |
90º |
| Materials: |
Fused Silica, BK7, CaF2, ZnSe, Si, All Glass, All Crystals |
Surface Figure:
BK7, UVFS, FS:
CaF2:
ZnSe, Si: |
All polished surfaces:
λ/20 at 633 nm
λ/4 at 633 nm
λ/40 at 10.6 µm |
Surface Quality:
BK7, UVFS, FS:
CaF2:
ZnSe, Si:
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All polished surfaces:
10-5
20-10
40-20
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| Dimensional Tolerance: |
± 0.010" |
| Angular Deviation: |
≤ 3 arc minutes |
| Bevels: |
0.010" – 0.030" at 45º |
| Clear Aperture: |
Central 85% of diameter |
| Reflectance: |
Tp, Ts, Rp, Rs = 45% + 10% |
| Absorption: |
R ≤ 10% |
| Reflectance: |
R < 0.25% per surface, all entrance and exit surfaces |
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