γ射线辐照对掺Yb光纤材料性能的影响  

Effects of γ-radiation on Yb-doped fiber

作　　者：黄宏琪 赵楠[1] 陈瑰[1] 廖雷[1] 刘自军[1] 彭景刚[1] 戴能利[1] 

机构地区：[1]华中科技大学,武汉光电国家实验室,武汉430074

出　　处：《物理学报》2014年第20期25-31,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61378070);湖北省自然科学基金(批准号:ZRY0535)资助的课题~~

摘　　要：采用改进的化学气相沉积法制备掺Yb石英光纤预制棒,以该预制棒制备了尺寸为10/130μm的双包层掺Yb光纤,将这些光纤分成若干组,在不同剂量的60Coγ辐射源下辐照,测试了光纤在辐射前后的吸收谱和激光性能以及光纤预制棒切片辐照后的吸收.实验结果表明:光纤中已存在的色心缺陷(如氧空位(II))和辐照引起的色心缺陷(如E’心、过氧基以及Yb2+离子)等因素的叠加作用可能导致辐照后的光纤在可见光区域的吸收显著增大;与辐照前相比,辐照后光纤的斜率效率、光-光效率显著下降,剂量越大激光性能下降得越厉害;基于Power-Law定理拟合了光纤辐致损耗与所受剂量的关系曲线,定量分析了不同剂量辐照后光纤激光性能下降的原因.研究结果将为进一步发展抗辐照光纤提供理论和实验依据.Yb-doped double-clad fibers are prepared through a conventional modified chemical-vapor deposition technique and solution doping method： each fiber contains a core of around 10 μm in diameter. These fibers are divided into groups under 60Co γ radiations of different doses, and we investigate the fiber absorption spectra and laser spectral properties before and after irradiation. Experimental results show that with increasing the irradiation dose the absorption of the fiber after irradiation increases significantly in the visible region, we believe that the enhancement of optical fiber absorption in the visible region may be due to the color center defects existing already in the fiber （such ODC （II）） and the color center defects produced by the irradiation （E＇center, POR and Yb2＋ions）. We also analyze slope efficiencies, bare efficiencies, and transmission characteristics of the fiber before and after laser irradiation. Finally, we use the power-law to fit the radiation-induced losses of the fiber under different radiation doses, and the results obtained in this paper provide a theoretical basis for studying the anti-radiation of optical fibers.

关 键 词：掺Yb双包层光纤 辐致损耗 色心 Power—Law定理 

分 类 号：TN253[电子电信—物理电子学]