在理论分析Bi₄Ge₃O₁₂(BGO)晶体磁光特性的基础上，利用倍频法测量了不同工作波长下BGO晶体的费尔德常量，获得了与理论相符的实验结果．同时根据BGO晶体费尔德常量随波长的变化关系曲线，通过对该晶体吸收系数的测量，得出了其磁光优值曲线．进而将BGO晶体的磁光特性与光纤电流传感器常用的几种磁光材料作了对比，结果表明BGO晶体适合用于光纤电流传感器．

Based on the theoretical analyses of the magneto-optical properties of a Bi₄Ge₃O₁₂(BGO) crystal,the Verdet constants of a BGO crystal at different wavelengths are measured employing the double frequency method. And the experimental results agree with the theoretical value. Combine the measured absorption coefficients with the relations between the Verdet constant and the light wavelengths,the magneto-optical figure of merit of the BGO crystal is presented. Additionally,the magneto-optical properties of a BGO crystal are compared with that of some magneto-optical materials usually used for optical fiber current sensor. The results show that BGO crystal is more suitable for fabricating optical fiber current sensors.