The nonlinear interactions between gratings generated during multibeam photorefractive recording with one reference and <i>N</i> object beams have been investigated theoretically. It is shown that nonlinear cross talk between gratings, which is well known in three-beam recording, persists and even increases for the practical relevant case in which the number of object beams <i>N</i> is large. The magnitude of the cross talk depends on the particular grating, and it is significant for a range of intensities commonly used in many multibeam applications. Finally, it is shown that for large <i>N</i> (N>5) the nonlinear interactions strongly suppress most gratings, whereas specific gratings can be selectively amplified.
© 1999 Optical Society of America
J. Limeres, M. Carrascosa, F. Agulló-López, P. E. Andersen, and P. M. Petersen, "Nonlinear grating interactions in multibeam photorefractive recording: theoretical investigation," J. Opt. Soc. Am. B 16, 414-419 (1999)