Abstract

The steady-state beam-coupling gain during two-wave mixing in photorefractive materials has been analyzed in the strong nonlinear regime (high modulation depths). Numerical simulations have been carried out for ${\mathrm{B}}_{12}{\mathrm{SiO}}_{20},$ for which detailed information on photorefractive parameters is already available. First the amplitude and the phase mismatch (with regard to the light) of the recorded index grating and consequently the coupling gain coefficient were obtained under an applied field $E_0=5 \mathrm{kV}/\mathrm{cm}.$ Then the evolution of the intensities of the two interfering beams during propagation was determined for several light-modulation depths. The energy exchange was considerably enhanced with regard to the linear regime. The light and index fringe profiles at large modulation $m$ were also obtained. The bending for both kinds of fringe differed appreciably from that previously calculated with a linear approach to the material equations.

© 1998 Optical Society of America

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