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  1. Home
  2. Optics
  3. Polarization Optics
  4. Brewster Windows
  5. RMI Infrared Brewster Window - ZnSe - Ge - Chalcogenide Glass

RMI Infrared Brewster Window - ZnSe - Ge - Chalcogenide Glass

Rocky Mountain Instrument Co.
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RMI Infrared Brewster Window - ZnSe - Ge - Chalcogenide Glass

OVERVIEW

Brewster Windows are primarily used in laser cavities to produce a beam with a high degree of polarization purity. When unpolarized light is incident on an uncoated substrate at Brewster’s Angle, the reflected portion is completely S polarized and the transmitted portion is partially P polarized. Multiple passes through the substrate substantially reduces the S component in the transmitted beam, resulting in a highly P polarized output. Multi-layer Thin Film Polarizer coatings can be applied to these substrates to greatly improve efficiency and extinction ratio on a single pass through the substrate.

Brewster windows are an economical option for coupling linearly polarized light into sealed optical systems and to select the polarization of light traveling in optical cavities.

Brewster's angle can be calculated using the following equation:

θB=Arctan(nw/na)

Where θB is Brewster's angle and nw and na are the indices of refraction for the window and the ambient respectively. na is usually assumed to be 1 for air.

SPECIFICATION

  • Substrate Material: ZnSe, Ge, Chalcogenide Glass
  • Surface Quality (Scratch-Dig): 40-20
  • Wavefront Distortion: <= Lambda/20
  • Diameter (Minor Axis): - mm
  • Thickness: - mm
  • Thickness And Diameter: Based on customer needs 
Download Data Sheet

Applications

- Brewster Windows are primarily used in laser cavities to produce a beam with a high degree of polarization purity.


- Economical option for coupling linearly polarized light into sealed optical systems and to select the polarization of light traveling in optical cavities.

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