Strong coupling between coherent gratings due to nonlinear spatial frequency mixing in Bi12SiO20

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    Nonlinear interactions between multiple coherent photorefractive gratings in Bi12SiO20 are investigated. It is demonstrated that the nonlinear mixing, or cross talk, is strongly influenced by the intensity ration kappa between the two object beams. The diffraction efficiency of a specific grating may be increased or strongly decreased depending on kappa. In the limit of a weak reference beam intensity compared to the sum of the object beam intencities, we derive an analytical expression for the cross talk valid for all kappa. Furthermore, we find the value of kappa yielding zero cross talk. We investigate the numerical calculations experimentally in a three-wave mixing setup and obtain good agreement between the experimental data and our predictions. Experimentally, we observe relative changes in the diffraction efficiency up to 500% due to nonlinear interactions between gratings
    Original languageEnglish
    JournalOptics Communications
    Pages (from-to)185-192
    Publication statusPublished - 1996

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