Abstract

We demonstrate that the diffraction efficiency of a grating photoinduced in an FA(II) KCl:Li crystal by two perpendicularly polarized light vibrations may be amplified, for a given wavelength, by coupling the directly transmitted and diffracted beams. The best results are obtained for the reading wavelength λD, corresponding to the isobestic point of the crystal and situated between the maxima of the FA2 and FA1 bands. For this wavelength, the transmittance of the crystal is approximately 12.5% (at 78 K). Using beam ca coupling, we obtain a diffraction efficiency approximately equal to 12%.

© 1988 Optical Society of America

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