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Proposed, justified and tested measuring of beam spatial coherence, based onthe detection of an interference visibility of the equal to intensity of beamreplicas emerging under reflection from the rotated plane-parallel plate. Themethod consists in measuring the interference contrast at the simultaneouschange of the longitudinal path difference and transverse shift of namedreplicas. Accurate measurement of the angle of rotated plate and the amplitudedistribution of interferential minimaxes allows to determine the width of thebeam spatial coherence. Spatial coherence of some types of multimode lasers hasbeen measured by the method. Keywords: coherence measurements, interference in2 move apart beam, rotable interferometer

Measurement of radiation coherence by means of interference visibility in the reflected light