Polarizing beam-splitters of the cemented cube form are considered and the designs of a number of multilayer thin-film coatings of ZnS and cryolite giving polarizing efficiencies at the design wavelength of greater than 99·8 per cent are discussed. The refractive index of the cube is chosen to match that of the optical cement, so that wedge fringes due to the cement layer are eliminated.
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R. P. Netterfield (1977) studied this question.
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