中文摘要：

围绕光纤陀螺的近红外工作波长,从回波损耗、偏振相关损耗、散射损耗、吸收损耗、模场分布以及导模传播常数等方面实验考察了总剂量为120krad（1.2kGy）的γ辐照对石英单模光纤导波特性的影响;用近红外光谱技术和受激喇曼散射实验估计了相应的隙内缺陷能级及其增量;用X衍射考察了介质密度变动;采用高灵敏度干涉回路观察到了γ辐照光纤的光热效应,测试数据表明紫外退火具有一定的修复作用,揭示了紫外退火作为一种主动加固方式用于抗γ辐照的可能性.

英文摘要：

Around the near-infrared wavelength at which optical fiber gyroscope works,the effects of 120 krad γ-irradiation on single-mode quartz fiber are studied experimentally from the following several aspects： return loss,polarization dependent loss,scattering loss,absorption loss,mode field distribution and guided-mode propagation constants.The gap defect energy level and its increment are estimated from near-infrared spectroscopy and stimulated raman scattering experiment.The medium density change is studied by x-ray diffraction.The photothermal effect of irradiated fiber with γ-ray is observed by a high sensitivity interference circuit.The test data show that the UV anneal has some repairing effect,revealing the possibility that UV annealing method can serve as a mannes of active reinforcement.