BREWSTER ANGLE

The Brewster angle polarizer is made of two calcite prisms which are assembled with an air space. It is designed such that for the transmitted extraordinary -p polarization, each of the four faces is at Brewster's angle ( computed at about .830 micrometers ), which makes transmission loss of -p polarization as practically zero. Due to non-normal angle of incidence, the transmitted beam suffers a beam displacement which is approximately 6 mm and 11 mm for 5 mm and 10 mm clear aperture Brewster angle polarizer, respectively. In its mount, the Brewster angle polarizer is mounted in such a way that the incident beam normal to one of the two aperture holes in the mount is automatically incident at Brewster's angle at the entrance face of the polarizer.