Proceedings PaperSelf-organization of spontaneous structures in photosensitive layers
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Thin photosensitive films being irradiated by a feeble polarized laser beam are able to record periodic structures (spontaneous diffraction gratings). These spontaneous gratings (SG) are a result of interference between the incident beam and scattered in film wave guide TE- and TM-modes. By a character of their development, the SG in photosensitive layers are similar to surface SG induced on a surface of metals or semiconductors by a strong laser irradiation. At a number of theoretical works, a complicated self-organization of spontaneous structures accompanied by the rise of secondary and multiple gratings on final nonlinear stages of their growth is predicted. The emergence of secondary SG on germanium surface was reported in. The nonlinear stages of growth of volume noise holograms in photosensitive media also were investigated. This paper reports the rise and multiplication of SG in the AgCl-Ag photosensitive layers irradiated by polarized laser beam in the case of frustrated total internal reflection. The important role of two-dimensional Bragg diffraction of wave guide modes in formation of SG on nonlinear stages of their growth is shown.