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An analysis of light-induced space-charge field, valid for the propagation of two-dimensional solitons in photorefractive (PR) crystals, is carried out. Under conditions appropriate to the formation of self-trapped beams, the equation for the electrostatic potential is simplified and solved, to obtain an analytical expression for the space-charge field, and thus the refractive index change. The expression...
An analysis of photorefractive (PR) oscillators consisting of two facing four-wave mixing regions is carried out. The threshold and operation conditions of different phase conjugate mirrors are discussed with the help of the grating action method. In particular, the threshold and the operation of the two-zone double phase conjugate mirror (DPCM) is compared with other related PR oscillators, the interconnected...
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