Abstract

A small photochromic grating is selectively and continuously detected from a much larger photorefractive modulation in Fe-doped LiNbO₃ crystals in a two-wave mixing experiment. The recording setup is actively fixed to either the photochromic or the photorefractive grating. In the former case a photorefractive modulation largely exceeding the value required for 100% diffraction efficiency is achieved. In the latter case this modulation is limited to 100%. Experimental results are in good agreement with the theoretical model.

© 1994 Optical Society of America

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