The nonlinear stage of acoustic wave phase conjugation over the threshold of absolute parametric instability is considered with respect to magnetic active media. The common case of nonlinear, nonstationary and spatially inhomogeneous parametric interaction is studied. Theoretical results are compared with experimental data on phase conjugate wave gain measurements in ferrite. It is shown that the pumping exhaustion mechanism of nonlinearity provides a reproduction of incident wave field distribution in the output of the active zone by parametric phase conjugation in the overthreshold regime of giant amplification in ferrite. The signal and fluctuation mode competition is shown to be essential for overthreshold limitation of phase conjugate wave amplitude.
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Vladimir Preobrazhensky (1993) studied this question.
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