Rocky Mountain Instrument Co.

Optical Coatings:

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Polarizers » Thin Film Plate (VIS/NIR)


400 nm ≤ λ < 2.0 µm

Thin Film Plate Polarizer coatings are applied to window substrates and are primarily for use in laser cavities. Designed to operate at Brewster’s angle, they efficiently separate an incident, unpolarized, monochromatic beam into its S and P polarization components.

The extinction ratio (Tp/Ts) exceeds 200:1 in the transmitted beam.

Coatings for high power wavelengths use special materials that are able to withstand higher power than standard thin film plate polarizer coatings. These all dielectric coatings are sensitive to wavelength and angle of incidence.


RMI Standard Specifications
Angle of Incidence: Brewster’s Angle (θB)
Reflectance: Rs ≥ 99%
Transmittance: Tp ≥ 95%
Extinction Ratio: Tp/Ts ≥ 100:1