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Brewster Windows

Brewster windows are uncoated substrates that can be used as polarizers in tandem, or to increase the degree of polarization of partially polarized light.

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Brewster windows are precision optical substrates designed for polarization control applications without the need for optical coatings.

When installed at the designated Brewster angle, these windows utilize the natural polarization characteristics of light. P-polarized light can pass through the surface with minimal reflection, while S-polarized light is partially reflected, enabling efficient polarization separation and control.

Brewster windows can be used individually or combined in tandem configurations to enhance the polarization purity of partially polarized light. They are widely applied in laser systems and high-power optical applications where coating-free polarization performance is required.

Product Features

Coating-Free Polarization Performance

Brewster windows achieve polarization separation through precise angle positioning rather than thin-film coatings, making them suitable for applications requiring high optical power handling capability.

High Optical Accuracy

Manufactured from high-quality optical materials with strict surface control, Brewster windows provide low wavefront distortion and reliable transmission performance for precision optical systems.

Stable Polarization Control

The accurately controlled Brewster angle ensures effective separation between P-polarized and S-polarized light, supporting stable polarization management in laser and optical assemblies.

Specifications

Specification Parameter
Material UV Fused Silica / N-BK7
Surface Quality 10/5 – 20/10
Transmitted Wavefront Distortion (TWD) λ/10 @ 632.8nm
Brewster Angle 55°32‘ – 55°57’ @ 633nm
Parallelism ≤5 arc sec

Typical Applications

Polarization Optics

Brewster windows are commonly used in polarization-related optical systems, including:

  • Polarizing elements inside laser resonator cavities;

  • Transmission polarizers;

  • High-power laser systems as alternatives to thin-film polarizers;

  • Polarization coupling and decoupling applications.

With high optical precision and coating-free operation, Brewster windows provide a reliable solution for laser polarization control, especially in systems where durability and high-power compatibility are critical.

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