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Improvement of the Degree of Spatial Coherence in a Michelson Interferometer

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Abstract

The visibility of fringes of equal thickness of an approximately plane parallel plate illuminated by a quasi-monochromatic primary source is expressed in terms of the degree of longitudinal spatial coherence, i.e., the coherence of two points lying on a normal to the source. Use of polarization interferometers to increase the degree of coherence is discussed. This permits the use of a large source in a Michelson interferometer even when its two armlengths differ significantly.

© 1967 Optical Society of America

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