Brewster Windows

Brewster windows are windows designed for use at Brewster's angle (usually uncoated). This is the angle where only incident
p-polarized light has 0% transmission loss. They 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.

BK7, UVFS, FS, CaF2, MgF2, BaF2, ZnSe, ZnS, Ge, Si, Sapphire, Cleartran, Infrasil, Suprasil
Angle of Incidence:
Brewster’s Angle (θB)
Surface Figure:
λ/4 at 633 nm of Both Surfaces
Surface Quality:
20-10 or better of Both Surfaces
Dimensional Tolerance
+ 0.0 – 0.01mm
Thickness Tolerance:
± 0.01mm
Brewster ≤ 10 seconds, Elliptical ≤ 3 minutes
0.02" at 45º typical
Clear Aperture:
Exceeds Central 85% of diameter