Nonlinear Cross Talk Between Mutually Incoherently Recorded Gratings In BaTiO3

Recently, nonlinear coupling of simultaneously coherently recorded gratings in photorefractive BSO has been studied experimentally and theoretically [1]. This so-called nonlinear cross talk is induced through the nonlinear response of the photorefractive material. In applications involving multibeam interactions, such as photorefractive image amplification and holographic storage, the nonlinear cross talk may strongly affect the grating efficiencies. Previous interpretations of multibeam experiments in BaTiO3 are based entirely on beam coupling, which may lead to a disagreement between theory and experiments [2].