Rocky Mountain Instrument Co.
1.303.664.5000
 

Optical Components:

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Polarizers » Cube Beamsplitters

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.

 
 
 
sketch-polarizing-cube-beamsplitter
 
 
RMI Standard Specifications
Materials:
BK7, UVFS, FS,
CaF2
Angle of Incidence:
Angle of Reflectance: 90°
Surface Figure:
BK7, UVFS, FS:
CaF2:
All polished surfaces:
λ/20 at 633 nm
λ/4 at 633 nm
Transmitted Wavefront: λ/4 at 633 nm typical
Surface Quality:
BK7, UVFS, FS:
CaF2:
All polished surfaces:
10-5
20-10
Dimensional Tolerance: ± 0.010"
Transmitted Beam Deviation:
< 3 minutes
Reflected Beam Deviation: < 6 minutes
Bevels: 0.010" – 0.030" at 45º
Clear Aperture: Central 85% of edge dimension
Reflectance:
Rs > 99.9%
Transmittance:
Tp > 95%
Extinction Ratio: Tp/Ts > 1000:1
Anti-Reflection Coating: R ≤ 0.25% per surface,
all entrance and exit
surfaces