Rocky Mountain Instrument Co.

Optical Coatings:

Developed in conjunction with

Polarizers » Cube Beamsplitter (VIS/NIR)


400 nm ≤ λ < 2.0 µm

Polarizing Cube Beamsplitter coatings are deposited between two right angle prisms that are permanently cemented together. They are designed to separate an incident, unpolarized, monochromatic beam into its S and P polarization components with an extinction ratio (Tp/Ts) in excess of 1000:1.

The incident energy is split into two orthogonally polarized beams that emerge at 90° with respect to each other.

These coatings are also useful for combining two orthogonally polarized beams.


RMI Standard Specifications
Angle of Incidence:
Angle of Reflectance: 90º
Reflectance: Rs ≥ 99.9%
Transmittance: Tp ≥ 95%
Extinction Ratio: Tp/Ts ≥ 1000:1