We demonstrate that the diffraction efficiency of a grating photoinduced in an F_A(II) KCl:Li crystal by two perpendicularly polarized light vibrations may be amplified, for a given wavelength, by coupling the directly transmitted anddiffracted beams. The best results are obtained for the reading wavelength λ_D, corresponding to the isobestic point of the crystal and situated between the maxima of the F_A2 and F_A1 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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