Glan–Foucault prism
Type of polarizer / From Wikipedia, the free encyclopedia
A Glan–Foucault prism (also called a Glan–air prism) is a type of prism which is used as a polarizer. It is similar in construction to a Glan–Thompson prism, except that two right-angled calcite prisms are spaced with an air gap instead of being cemented together.[1] Total internal reflection of p-polarized light at the air gap means that only s-polarized light is transmitted straight through the prism.