For some laser applications the windows set at Brewster angle with respect to the incident light are often used in laser cavities. The p-polarized radiation transmits the Brewster angle window without any Fresnel losses and the window does not need to be coated which increases its lifetime in laser medium ambience.

Brewster angle window can be also used as a polarizer both in reflection and in transmission. In reflection, the output light is 100% s-polarized however there are some energy losses due to transmitted part of the light. In transmitted light we have 100% energy of p-polarized part of incident light however some of the s-polarized radiation is also transmitted, therefore series of windows are needed to obtain a high degree of polarization.