The universal degenerate and nearly degenerate FWM nonlinear equations in uniform magnetized plasma are given for the formation of reflection grating configuration and its exact solution appropriated for arbitrary complex coupling parameters under undepleted pump assumption is obtained. The solution is quite suited to various plasma situations but also can be extended to photorafractive materials. It is hoped that it may be helpful for further studying FWM' s phase conjugation theory and developing new nonlinear optical device , especially , for developing new fusion diagnostics by using FWM's principle.
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