A strong pump-power dependence of the Rayleigh-type optical-mixing signal for a water solution of malachite green is reported. Experimental evidence of an exponential pump-power dependence is given. The essential characteristics of the pump-power dependence and the frequency spectrum of the nonlinear signal are qualitatively reproduced by a theoretical model where coupling between pump, probe, and signal fields and propagation effects are considered.
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Paz et al. (1988) studied this question.
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