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给出等离子体介质中的简并与近简并四波混频形成透射光栅时的普适四波非线性耦合方程组。得到了在任意复耦合系数下的精确解析解，其解不仅适用于各种等离子体形态，也可以推广到光致折射材料中去。对进一步理论研究四波混频相位共轭原理以及研制新型非线性光学器件有所帮助。
The universal four-wave nonlinear coupling equations for degenerate and near-degenerate and four-wave mixing in a plasma medium are given. The exact analytical solution under any complex coupling coefficient is obtained. The solution is not only applicable to various plasma morphologies, but also can be generalized to the photo-refractive materials. The further theoretical study of four-wave mixing phase conjugation principle and the development of new nonlinear optics helpful.