Polarization Analyzer Based On Anisotropic Interference And Diffraction
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-02
A polarization analyzer is composed of gratings of birefringent and isotropic material contacted to one another. The ordinary (or extraordinary) index of the birefringent material matches the index of refraction of the isotropic material. Thus, for one direction of polarization, the sandwich structure acts as a transparent window and does not deviate the beam. The other polarization encounters a phase grating which deflects a portion of the beam to both sides by an angle r=g/d. If the step height of the grating is s = g/(ne - no), the zero order beam is totally cancelled.