Optical phase gratings in photorefractive electrooptic media are produced by photoinduced space-charge fields. The grating formation permits a phase shift between the light interference fringe and the refractive-index modulation. Since recording and readout in real-time holography occur simultaneously, this fringe shift gives rise to a nonreciprocal steady-state energy exchange between writing beams.1

© 1984 Optical Society of America

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