The variation with rotation angle, of the fringe visibility at the output of a rotation shearing interferometer illuminated with unpolarised light, is investigated both theoretically and experimentally. It is shown that highly contrasted fringes can be obtained for any rotation angle, by cementing an appropriate phase plate to the entrance face of each roof-prism. Neither a polarizer nor an analyzer is necessary. The method can be applied to any interferometer using roof-prisms.
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Roddier et al. (1978) studied this question.
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