中文摘要：

给出了任意倾斜偏置磁场作用下相位失配时微波静磁波与导波光的磁光耦合方程，分析了相位失配对导波光衍射效率及其衍射方向的影响．计算了YIG薄膜波导中静磁反向体波与导波光非共线作用的Bragg衍射效率，传统磁化时计算结果与实验结果一致．计算表明，与传统磁化情形相比，适当的偏斜磁场可使导波光衍射效率提高6dB以上；当导波光入射角保持不变时，由磁场方向改变引起的相位失配对衍射效率的影响不大．因此，优化偏置磁场方向是改善磁光Bragg器件衍射性能、提高磁光带宽的有效方法．

英文摘要：

The magneto-optic （MO） coupled-mode equations for magnetostatic waves （MSWs） and guided optical waves （GOWs） under phase-mismatch conditions were deduced and applied to the noncollinear interaction with magnetostatic backward volume waves （MSBVWs） in obliquely magnetized yttrium-iron-garnet （YIG） film using single-element microstrip line transducer. The diffraction efficiency （DE） of the incident TE0-mode light was calculated. For the case of magnetization along the MSBVW propagation direction, the calculated results are in good agreement with the experimental data. In contrast, by using an appropriately tilted bias magnetic field the DE can be increased by 6dB and is insensitive to the phase mismatch induced by the change of magnetization direction. Thus, the optimization of the direction of the bais magnetic field is an effective method for improving the diffraction performance and increasing the MO bandwidth of the Bragg cells.