中子辐照对掺镱光纤材料光学特性的影响  

Effects of neutron irradiation on optical characteristics of Yb-doped fiber materials

作　　者：李奋飞 周晓燕[2] 张魁宝 石兆华[2] 陈进湛 叶鑫[2] 吴卫东[2] 李波[2] Li Fen-Fei;Zhou Xiao-Yan;Zhang Kui-Bao;Shi Zhao-Hua;Chen Jin-Zhan;Ye Xin;Wu Wei-Dong;Li Bo(State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China;Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]西南科技大学,环境友好能源材料国家重点实验室,绵阳621010 [2]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《物理学报》2021年第19期1-7,共7页Acta Physica Sinica

基　　金：国家自然科学基金委员会-中国工程物理研究院联合基金(批准号:U1830203);国家自然科学基金(批准号:51672228)资助的课题.

摘　　要：采用改进型化学气相沉积法结合稀土螯合物掺杂制备了系列掺镱光纤预制棒及光纤,并测试了光纤(预制棒)辐照、退火前后的光学性能.结果表明:中子辐照后掺镱光纤材料中与Al相关的缺陷浓度增多,导致光纤材料在可见光区域吸收损耗增加.Ce离子的掺杂可缓减铝氧空位中心(Al-OHC)等色心缺陷的增加,从而有效抑制掺镱光纤的辐致暗化效应.热退火可降低中子辐致色心缺陷的浓度从而降低光纤材料的吸收,在一定程度上消除暗化效应.Yb-doped fiber laser is a very appealing technology to implement space communication,laser radar and nuclear facilities due to its reduced weight,size,high efficiency,high peak power combined with good beam quality.However,Yb-doped fiber materials will suffer a harsh ionizing radiation(such as neutron,proton and electron)under the condition of irradiation.The radiation-induced darkening effect can lead the fiber loss to increase obviously,the laser slope efficiency to decrease drastically,and even no laser output to be observed in severe cases.Therefore,it is necessary to conduct in-depth research on the performance changes of Yb-doped fiber materials subjected to the irradiation.In this paper,a series of Yb-doped optical fibers and optical fibers is prepared by the improved chemical vapor deposition method combined with rare-earth chelate-doped.And the optical properties of the optical fiber before and after being irradiated and annealed are tested.We mainly investigate the absorption spectrum of Yb-doped fiber material.The results show that the concentration of Al-related defects in the Yb-doped fiber material increases after neutron irradiation,and the absorption loss in the visible region increases.And the color center defects produced by the irradiation will significantly reduce the Yb ion fluorescence lifetime.The doping of Ce ions can reduce the Al-oxygen hole center(Al-OHC)color center defects,and can suppresse the radiation-induced darkening effect of Yb-doped fiber to a certain extent.Thermal annealing can reduce the absorption of fiber material by reducing the concentration of neutron radiation-induced color center defects,and thus eliminating the darkening effect to a certain extent.Finally,with our previous research,we find that neutron irradiation and ray irradiation have similar effects on the optical properties of Yb-doped fiber materials.The main reason is that the electron ionization effects occur due to both ray irradiation and neutron irradiation to generate free electron and hole pairs,which

关 键 词：掺镱光纤 辐照 光谱 热退火 

分 类 号：TN253[电子电信—物理电子学]