Polarizing Cube Beamsplitters
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Polarizing Cube Beamsplitters are formed from two right angle, 45° prisms permanently cemented together. The hypotenuse is coated with an all dielectric, polarization sensitive coating designed to separate an incident, unpolarized, monochromatic beam into its S and P polarization components. The extinction ratio (Tp/Ts) exceeds 1000:1 in the transmitted beam. The two orthogonally polarized beams emerge from the cube at 90° with respect to each other. All entrance and exit surfaces are coated with a high efficiency, narrowband, 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 |
| Material: |
BK7, UVFS, FS, CaF2, ZnSe, Si, All Glass, All Crystals
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Surface Figure:
BK7, UVFS, FS:
CaF2:
ZnSe, Si:
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All polished surfaces:
λ/20 at 633 nm
λ/4 at 633 nm
λ/40 at 10.6 µm
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| Transmitted Wavefront: |
λ/4 at 633 nm typical
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Surface Quality:
BK7, UVFS, FS:
CaF2:
ZnSe, Si:
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All polished surfaces:
10-5
20-10
40-20 |
| Dimensional Tolerance: |
± 0.010" |
Transmitted Beam Deviation:
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< 3 minutes |
| Reflected Beam Deviation: |
< 6 minutes |
| Bevels: |
0.010" – 0.030" at 45º |
| Clear Aperture: |
Central 85% of edge dimension |
Reflectance:
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Rs > 99.9% |
Transmittance:
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Tp > 95% |
| Extinction Ratio: |
Tp/Ts > 1000:1 |
| Anti-Reflection Coating: |
R ≤ 0.5% per surface,
all entrance and exit
surfaces |
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