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根据耦合模理论，分析了磁光波导中静磁波与导波光的相互作用特点，给出了导波光模式之间的耦合方程。理论分析表明，仅当垂直磁化时，发生模式转换的导波光才被全部衍射，此时衍射效率等于模式转换效率。计算了斜向场作用下ＹＩＧ薄膜中导波光的反斯托克斯相互作用衍射效率，所得结论与实验结果一致。适当倾斜静磁场，导波光的模式转换和衍射效率均可比垂直磁化时明显提高。同时改变静磁体波传播方向和斜向场的偏离方向（与垂直方向的夹角不变），导波光的衍射效率几乎不变
According to the coupled mode theory, the interaction between magnetostatic wave and guided light in magneto-optical waveguide is analyzed, and the coupling equation between guided light modes is given. The theoretical analysis shows that the guided light which undergoes mode conversion is totally diffracted only when perpendicular magnetization, and the diffraction efficiency is equal to the mode conversion efficiency at this time. The anti-Stokes interaction diffraction efficiency of guided light in YIG thin film under oblique field was calculated. The conclusion is consistent with the experimental results. Appropriate tilt static magnetic field, waveguide mode conversion and diffraction efficiency than the perpendicular magnetization significantly improved. While changing the static magnet wave propagation direction and the deviation of the direction of the field (the same angle with the vertical direction), guided light diffraction efficiency almost unchanged