磁光薄膜波导中光导波的模式转换和衍射效率计算

根据耦合模理论，应用微扰方法分析了Ｂｉ：ＹＩＧ薄膜波导中斜向静磁场对静磁波与导波光相互作用的影响，计算了斯托克斯和反斯托克斯相互作用中导波光的模式转换效率和衍效率。

Calculations on the Efficiecies of Modeconversion and the Diffraction of Guided Optical Waves with Magnetostatic Waves in Bidoped YIG Film

According to the coupledmode theory,the effect of bias inclined magnetic field on the interaction of guided optical waves and magnetostatic waves in the Bi:YIG film waveguide is analyzed by means of the perturbation method.The diffraction efficiency(DE) and the modeconversion efficiency(MCE) in the Stokes and antiStokes interactions are calculated.Calculation results indicate that,only at normal magnetization,the MCE and the DE are equal in magnitude;under appropriately inclined magnetic field,both the MCE and the DE in the Bi:YIG film can be increased by a big margin;when the inclined angle >4,the DE (or the MCE) in the Stokes interaction is basically equal to that in the antiStokes interaction.