Abstract
Results are reported on an optical effect observed with a thick, two-beam holographic transmission grating. Illumination of the grating with a narrow laser beam (beam waist much smaller than grating thickness) results in the emergence of four diffracted beams at the rear surface of the hologram. The results are in qualitative agreement with the theory of Chu and represent an optical analogue of an X-ray diffraction effect predicted by Kato and observed by Authier.
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