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>Second-harmonic generation at periodic second-order susceptibility gratings with self-phase and cross-phase modulation
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Second-harmonic generation at periodic second-order susceptibility gratings with self-phase and cross-phase modulation
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机译：Second-harmonic generation at periodic second-order susceptibility gratings with self-phase and cross-phase modulation
Quasi-phase-matched second-harmonic generation at periodic quadratic susceptibility gratings with self-phase and cross-phase modulation owing to Kerr nonlinearities is investigated. A model of interaction of monochromatic plane travelling waves is considered. The solution assumes a nondepleted pump and results for a numerical computation of second-harmonic conversion efficiency for a highly efficient process are presented. It is shown that for high spatial-frequency gratings the efficiency of second-harmonic generation depends on the reduced detuning δ and the Kerr-nonlinearity coefficient κ only. In some cases, if the signs of δ and κ are opposite, the Kerr nonlinearity can enhance the second-harmonic conversion efficiency due to the compensation of the phase mismatch attained in the below-half-conversion stage by the reversed phase mismatch in the above-half-conversion stage of the process. The computed maximum conversion efficiencies for various values of δ and κ are plotted in a contour map on the δ-
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