Optimum thickness of air gap of air-spaced polarizing prism

The air gap of polarization prism is influential to the transmissivity of this type of polarizer.Optimized design of the thickness of air gap is very useful to improve e-ray transmission in polarization prism.By means of the Glan-Taylor prism,based on the theory of Fresnel formula and multiple-beam interference,the calculation formulum of e-ray transmissivity in air-spaced prism is put forward.The law of the e-ray transmissivity varing with the air gap thickness is analyzed so that the optimum air gap thickness can be obtained to design an optimum polarizing prism.