静磁波与导波光的磁光耦合理论

根据耦合模理论，分析了砂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材被全部衍射，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间显提高。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

Theory for Magneto-Optical Couplings of Magnetostatic Waves and Guided Optical Waves

According to the coupled mode theory, the interaction of guided optical waves (GOWs) and magnetostatic waves (MSWs) in magneto optical waveguide are theoretically studied and the coupled mode equations are obtained. The angular dependence of GOW diffraction efficiency for anti Stokes interaction in YIG film are calculated. The theoretical curves have the same characteristics as the experimental results. Only in the case of normal magnetization, the waveguided lights with mode conversion are all diffracted and the diffraction efficiency is equal to the mode conversion efficiency. Under appropriately inclined bias magnetic field, both mode conversion efficiency and diffraction efficiency may be increased distinctly in comparison with normal magnetization. After changing the direction of MSW propagation, the angular dependence of DE becomes symmetrical.