Nonlinear grating interactions in multibeam photorefractive recording: theoretical investigation

摘要

The nonlinear interactions between gratings generated during multibeam photorefractive recording with one reference and N 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 N 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 N (N>5) the nonlinear interactions strongly suppress most gratings, whereas specific gratings can be selectively amplified.