Nonlinear interactions between multiple gratings simultaneously recorded in a BSO crystal have been experimentally investigated. A forward four wave mixing configuration (one reference and three object beams) has been used to generate the gratings. As in previous experiments with only two object beams relevant cross talk effects have been found. The magnitude of the cross talk markedly depends on the relative intensity ratio between beams. Furthermore, it is demonstrated that enhancement of the diffraction efficiency may be achieved due to the nonlinear cross talk. The results can be well reproduced by theoretical calculations based on the band transport equations preserving their nonlinear terms.

© 1999 Optical Society of America

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