10kW高效率1070nm光纤放大器的理论与实验研究  

Theoretical and Experimental Investigation of a 10-kW High-Efficiency 1070-nm Fiber Amplifier

作　　者：陈晓龙[1,3] 何宇 徐中巍 郭晓晨 叶韧 刘恺[1] 杨依枫[1] 沈辉[1] 张海波[1] 于春雷[2] 何兵[1] 胡丽丽[2] 周军[1] Chen Xiaolong;He Yu;Xu Zhongwei;Guo Xiaochen;Ye Ren;Liu Kai;Yang Yifeng;Shen Hui;Zhang Haibo;Yu Chunlei;He Bing;Hu Lili;Zhou Jun(Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Key Laboratory of Materials for High Power Laser,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室,上海201800 [2]中国科学院上海光学精密机械研究所中科院强激光材料重点实验室,上海201800 [3]中国科学院大学材料与光电研究中心,北京100049

出　　处：《中国激光》2020年第10期172-178,共7页Chinese Journal of Lasers

基　　金：广东省重点领域研发计划(2018B090904001);国家自然科学基金(61735007,61705243,61805261);上海市自然科学基金(19ZR1464200,19ZR1464000);上海市青年英才扬帆计划(17YF1421200)。

摘　　要：基于掺镱光纤激光放大器理论模型,分析了光纤放大器中掺镱光纤弯曲半径对模式传输损耗的影响以及掺镱光纤长度对系统光-光转换效率的影响。结合实验中采用的掺镱光纤的特点,对掺镱光纤的弯曲半径及光纤长度进行了优化设计。基于主振荡放大结构中,种子光源的输出功率为170 W,光束质量为 M2x=1.10, M2y=1.05;放大器采用双端抽运的方式,使用自研30/600 μm掺镱光纤,最终实现了输出功率为10.14 kW,中心波长为1070.36 nm,3 dB带宽为5.32 nm的全光纤激光输出,光束质量为 M2x=3.12, M2y=3.18。放大级最大光-光转换效率为87.9%,斜率效率为89.2%,输出激光信噪比大于45 dB。Based on the theoretical model of ytterbium (Yb 3+)-doped fiber amplifier, the effect of the bend radius of Yb 3+ fiber on the mode transmission loss and dependence of optical-optical efficiency on the fiber length were analyzed. By employing the characteristics of the Yb 3+ fiber used in the experiment, the bend radius and fiber length were optimized. A master oscillation power amplification configuration was used. This configuration had a seed laser source with 170 W power, beam quality M2x=1.10, M2y=1.05, and a power amplifier with homemade 30/600 μm Yb 3+ fiber as the gain fiber. Dual-end pumping was adopted. We obtained a laser beam with an output power of 10.14 kW, a central wavelength of 1070.36 nm, and a 3 dB bandwidth of 5.32 nm. The beam quality of the output laser was M2x=3.12, M2y=3.18. In the amplification stage, the maximum optical-optical efficiency was 87.9%, and the slope efficiency reached up to 89.2%. The signal-to-noise ratio of the output laser was more than 45 dB.

关 键 词：光纤光学 光纤放大器 掺镱光纤 主振荡放大 双端抽运 高效率 

分 类 号：O436[机械工程—光学工程]