We have shown, in particular, an existence of bistable mode for energy conversion from pump waves to signal wave under certain conditions. In general case, there are greater than 10 various modes of four-wave interaction. Knowledge about these modes is very important for spectroscopic experiment results understanding using four-waves mixing because its result depends on them in a strong way. Analytical solution and developed modes can explain complicated regime of four-wave interaction which may appear at high intensity of interacting waves.
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Vyacheslav A. Trofimov, Igor E. Kuchik, "Explicit solution of FWM problem under the interaction of co-propagating laser beams in medium with cubic nonlinear response," Proc. SPIE 9503, Nonlinear Optics and Applications IX, 95030Q (18 May 2015);