A method for measuring Brewster's angle by circularly polarized heterodyne interferometry

Abstract

A new method for determining Brewster's angle is proposed based on the effect that the phase difference produced by a simple reflection from the test medium, for a two-frequency circularly polarized light source, is exactly equal to zero when the incident angle equals Brewster's angle. Its best resolution is 10(-3) deg and the validity of the method was demonstrated.