Optical Window

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. When placed at a precise Brewster angle, it allows light of a specific polarization direction (P-polarized light) to pass through completely without reflection, while reflecting away another portion of the light (S-polarized light).

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Specification of Brewster Windows

Specification & list
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.
Minor Diameters （mm）	Thickness （mm）
6	1
6	2
8	1
8	2
10	2
12.5	2
13	2
16	2
20	2
22	2
25	2

Typical Application Areas

Polarization Optics

1. As a polarizing element in a laser resonant cavity; 2. As a transmission polarizer; 3. As a replacement for thin-film polarizers (high-power applications); 4. Polarization coupling and decoupling.