1018 nm同带泵浦用Yb^(3+)掺杂石英光纤光谱性能研究  

Spectral Performance of Yb^(3+)-Doped Silica Fiber for 1018 nm Tandem-Pumping Technology

作　　者：董贺贺 王世凯[2] 王中跃[1] 于春雷[2] 邵冲云 韦玮[1] 胡丽丽[2] Dong Hehe;Wang Shikai;Wang Zhongyue;Yu Chunlei;Shao Chongyun;Wei Wei;Hu Lili(College of Blectronic and Optical Bngineering&College of Microelectronics,Nanjing University of Posts and Telecommurnications,Nanjing,Jiangsu 210023,China;The R&D Center for High Power Laser Compoments,Shanghai Institute of Optics and Fine Mechanics,Chinese Academg of Sciences,Shanghai 201800,China)

机构地区：[1]南京邮电大学电子与光学工程、微电子学院,江苏南京210023 [2]中国科学院上海光学精密机械研究所高功率激光单元技术实验室,上海201800

出　　处：《中国激光》2021年第11期68-77,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(61775224)。

摘　　要：采用溶胶-凝胶法结合纳米粉体高温烧结工艺制备了Yb-Al、Yb-Al-P和Yb-P三个体系共掺石英玻璃,系统探究了Al^(3+)和P^(5+)的含量变化对掺Yb^(3+)石英玻璃在1018 nm处吸收和荧光性能的影响规律。通过对比不同掺杂体系在1018 nm处的光谱性能发现,随着P^(5+)掺杂浓度的提高,1030 nm附近的荧光次峰蓝移至1018 nm附近,Yb-Р掺杂石英玻璃系列样品在1018 nm处的归一化荧光强度明显优于其他系列。利用Raman光谱结合超低温电子顺磁共振(EPR,4K)从原子尺度上对Yb^(3+)的配位环境进行了精确解析。Al^(3+)和P^(5+)的引入使得Yb^(3+)的配位环境迥异,这与Al^(3+)、P^(5+)对Yb^(3+)在1018 nm处光谱性质的影响规律相符。Objective Compared with the traditional pump light source of 915nm or 975nm diode lasers,the 1018nm Yb3+-doped fiber laser(YDFL)with a tandem-pumping structure is a high-efficiency pump light source for high-power lasers and offers the advantages of excellent beam quality,high brightness,and low quantum loss.However,the output power of the 1018nm YDFL is severely limited by the competition between the 1018nm signal and the amplified spontaneous emission (ASE)mode.Consequently,the efficiency of the 1018 nm fiber laser is significantly lower than the theoretical efficiency of the system,which is mainly attributed to the selection of the gain fiber.The absorption and fluorescence intensity of the traditional Yb3+-doped silica fiber at 1018nm are weak,which reduces the overall conversion efficiency of the laser system and limits the further development of 1018nm tandem-pumping technology.To improve the overall conversion efficiency of the laser system,two key materials-Yb3+-doped silica fiber generating 1018nm laser light using 976nm laser diode (LD)pumping and another Yb3+-doped silica fiber for absorbing the 1018 nm pump light-must be optimized urgently.For the former,the fluorescence at 1018nm must be increased,whereas for the latter,the absorption at 1018nm must be increased.Therefore,improving the absorption and fluorescence of Yb3+ions at 1018nm by introducing codopants into the Yb3+-doped silica glass to change the coordination environment of Yb3+ions is the key to improving the overall conversion efficiency of tandem-pumped silica-based YDFL systems.Methods Herein,Yb-Al(YA)double-doped,Yb-Al-P (YAP)triple-doped,and Yb-P (YP)double-doped silica glasses were prepared using the sol-gel method combined with nanopowder sintering technology.The influence of Al and P codoping on the spectral characteristics of 1018nm silica glass was systematically studied.By analyzing the difference in the Stark energy level splitting of Yb3+ions for different doping systems of silica glass,the influence of different codoping on th

关 键 词：材料 掺Yb^(3+)石英玻璃 1018 nm同带泵浦 光谱性能 稀土离子局域环境 

分 类 号：TB321[一般工业技术—材料科学与工程]