We demonstrate that the diffraction efficiency of a grating photoinduced in an F<sub>A</sub>(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<sub>D</sub>, corresponding to the isobestic point of the crystal and situated between the maxima of the F<sub>A2</sub> and F<sub>A1</sub> 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
Marie May, J. P. Hong, and Solange Debrus, "Amplification by beam coupling of the diffraction efficiency of a grating photoinduced in an FA(II) KCl:Li crystal," J. Opt. Soc. Am. B 5, 2333-2339 (1988)