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应用经典场论和耦合模理论计算了斜向静磁场作用下，磁性薄膜波导中静磁波与导波光的相互作用．计算结果表明，与垂直静磁场情形相比，斜向静磁场时的相匹配条件有所变化，由于磁性薄膜波导中法拉第磁光效应增强等因素，导波光的Ｂｒａｇｇ衍射效率得以显著增加．这有利于应用ＹＩＧ等低损耗磁性薄膜做成高衍射效率的磁光波导器件，亦有利于降低Ｂｉ∶ＹＩＧ等高比法拉第旋转的磁光薄膜波导器件的体积和损耗．此外，理论指出的在斜向静磁场条件下所具有的一些磁光特性与实验结果亦符合得很好．
The interaction between the magnetostatic wave and the guided wave in the magnetic thin film waveguide is calculated by the classical field theory and coupled-mode theory. The calculated results show that the matching condition of the oblique static magnetic field is changed compared with the case of the vertical static magnetic field. The Bragg diffraction efficiency of the guided light is significantly increased due to the increase of the Faraday magneto-optical effect in the magnetic thin film waveguide. This is beneficial to the application of low-loss magnetic thin films such as YIG to high-diffraction-efficiency magneto-optical waveguide devices and to the reduction of the volume and the loss of magneto-optical thin film waveguides with Bi: YIG-to-ratio Faraday rotation. In addition, some magneto-optical properties that the theory points out under the conditions of oblique static magnetic field are also in good agreement with the experimental results.