光纤γ辐照感生损耗的研究

Research on γ-Ray Radiolytic Loss

对几种国产光纤进行了γ辐照感生损耗谱的测量．发现光纤经辐照后，在０．６～０．７μｍ波段产生强烈吸收峰，在０．８～１．２μｍ区域感生损耗变化平缓，大于１．２μｍ有上升的趋势；同时给出了多模梯度光纤在０．８５μｍ波长下辐照感生损耗随辐照剂量变化的经验公式．γ辐照引起的顺磁缺陷中心导致光纤γ辐照感生损耗的产生．

In this paper,the induced loss of several optical fibers by γ-ray irradiation is measured.Experimental results show that there are strong optical absorption bands at 0.6￣0.7μm;the induced loss changes gently at 0.8￣1.2μm and there appears an ascending tendency at the wavebands more than 1.2μm.An empirical formula is obtained describing the variance in induce loss of multimode gradient optical fibers with irradiation doses at 0.85μm.It is γ-ray induced paramagnetic defeat center that causes γ-ray induced loss.