Brewster prism

glass

Brewster Prisms are designed to have an apex angle such that a p-polarized ray incident at Brewsters angle will pass through the prism parallel to the base at minimum deviation, and exit also at Brewsters angle. In this case surface reflection losses are negligible. Brewster Prisms are often used in situations where surface reflection losses cannot be tolerated. Brewster Prisms are also frequently used to select a single wavelength from a multi-wavelength laser. Tuning is accomplished by tilting the prism. These prisms have very low surface reflection losses over the range 190-425 nm and are usable from 190-2500 nm.