GLAN THOMPSON BEAM SPLITTING

The Beam Splitting Glan Thompson polarizer is made of two cemented prisms of calcite. It is a modification of the Glan Thompson polarizer in the sense that the totally reflected ordinary polarization is made to exit the polarizer. For an input beam at normal incidence, the two orthogonally polarized output beams exit at normal incidence to their respective output faces. Therefore, the beam separation angle of 37 degrees and 45 degrees in the two available versions is independent of wavelength. Their length to aperture ratio is 3.0:1 and 2.5:1, respectively. There is a slight mismatch of the refractive index of straight through the extraordinary beam and the cement. Due to this, some extraordinary polarization is reflected, which results in an unequal extinction ratio of the two output beams. These polarizers can be used from 350 nm to 2300 nm. The table shown lists A-grade polarizers. Polarizers made of B or S-grade of calcite are also available upon request.