Dynamic grating structure investigation

The structure of the transmission dynamic grating, that is formed during four-wave mixing in photorefractive medium with non-local response, was theoretical investigated. It was obtained the steady state solution for the common case of four input waves with its arbitrary phases. It is shown, that the structure of the dynamic grating is differed by its grating amplitude distribution, which described by the `soliton'-like function. It was determined the manner, how the grating amplitude distribution is depending on parameters of input coupling beams: intensities ratio and phases of waves. Input variation of waves parameters brings two phenomena: (1) changing of the grating half-wide; (2) changing of the grating amplitude maximum position. It was shown what in case of four input wave it is possible to record any shape of the grating amplitude distribution by varying input waves intensities or phases.