采用高温助熔剂熔盐生长出了复合掺杂YbBi∶YIG磁光石榴石单晶,并应用于磁光光纤电流传感器研制.此单晶的比法拉弟旋转为-404deg/cm,磁光优值为25.8deg/dB,饱和磁化场为1400Oe,温度系数为4.2×10-4K-1(室温,λ=1.55μm).与纯YIG相比具有较好的磁光性能,有更高的比法拉弟旋转角和磁光优值以及较小的温度依赖性.用此单晶作为法拉弟转子材料,建立了单光路结构的磁光光纤电流传感器的实验原型,测试了它在测量50Hz交变电流时的性能,测试结果表明传感系统具有较高的精度和灵敏度并有较好的线性关系.

A co doped Bi substituted rare earth iron garnet single crystal YbBi∶YIG was grown from high temperature solution, and was used first time for magneto optic optical fiber current sensors. The crystal has the specific Faraday rotation angle 404deg/cm, magneto optic figure of merit 25.8deg/dB, saturation magnetic field 1400Oe, and temperature coefficient 4.2×10 -4 K -1 (at room temperature, λ=1.55μm). It has larger Faraday rotation angle and magneto optic figure of merit and lower temperature sensibility than pure YIG.A laboratory prototype sensor was established using the YbBi∶YIG crystal as Faraday rotator element, and its sensing performance was tested under a 50Hz frequency AC. The tested results show that the sensor system has high accuracy, sensitivity and good linearity.