Search for: [Abstrakt = "In this paper, the nonlinearities resulting from the simple band transport model of photorefractivity are compared with dependences experimentally obtained in LiNbO3\:Fe crystals. The investigation of nonlinearities is performed for both periodic and aperiodic optical fields. The comparison shows that the space\-charge field cannot be the main cause of light\-induced refractive index changes."]

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