长波段半导体激光泵浦光纤激光器实现2 kW功率输出  

2 kW fiber laser pumped by long-wavelength laser diodes

作　　者：王鹏[1,2,3] 孟祥明 吴函烁 叶云 杨保来 奚小明 史尘 张汉伟[1,2,3] 王小林[1,2,3] 习锋杰[1,2,3] 王泽锋 许晓军[1,2,3] 周朴[1,2,3] 陈金宝[1,2,3] Wang Peng;Meng Xiangming;Wu Hanshuo;Ye Yun;Yang Baolai;Xi Xiaoming;Shi Chen;Zhang Hanwei;Wang Xiaolin;Xi Fengjie;Wang Zefeng;Xu Xiaojun;Zhou Pu;Chen Jinbao(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,China;Hunan Provincial Key Laboratory of High Energy Laser Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学前沿交叉学科学院,长沙410073 [2]国防科技大学南湖之光实验室,长沙410073 [3]国防科技大学高能激光技术湖南省重点实验室,长沙410073

出　　处：《强激光与粒子束》2024年第3期82-84,共3页High Power Laser and Particle Beams

基　　金：湖南省杰出青年基金项目(2023JJ10057);长沙市杰出创新青年培养计划项目(kq2206006);基础科学研究项目(JCKY2021525B015)。

摘　　要：半导体激光(LD)泵浦的高功率光纤激光器具有效率高、体积小、重量轻、稳定性好等优点,在工业加工等诸多领域都有着广泛的应用。为了提高泵浦光吸收率,传统光纤激光器常用915 nm和976 nm波段的LD作为激光的泵浦源。在该类LD泵浦的光纤激光器中,由于量子亏损和泵浦吸收系数相对较高,光纤激光器的热致模式不稳定(TMI)阈值相对较低。为了提高量子效率和潜在的TMI阈值,提出采用大于1010 nm波段的LD直接泵浦光纤激光器,产生高量子效率激光。搭建了振荡放大一体化的全光纤激光器,采用总泵浦功率为2.56 kW的1010 nm波段LD泵浦,首次获得输出功率2.05 kW、光束质量M^(2)约1.7的激光。后续将通过进一步增大泵浦功率、优化光纤特性以实现更高功率、更优光束质量的光纤激光输出。The high-power fiber laser pumped by laser diodes(LDs)has the advantages of high efficiency,small size,light weight,and good stability,and has been widely used in many fields such as industrial processing.To improve the absorption rate of pump laser,the 915 nm and 976 nm LDs are commonly used as the pump source of the traditional fiber lasers.The quantum defect and pump absorption coefficient are comparatively high in the fiber lasers pumped by these LDs,which leads to low transverse mode instability(TMI)threshold.To improve quantum efficiency and potential TMI threshold,the fiber laser directly pumped by LDs with wavelength longer than 1010 nm is proposed.An oscillating-amplifying integrated laser was built,and 2.05 kW output laser with beam quality M^(2)of 1.7 was realized when the fiber laser was pumped by 1010 nm LDs with maximum pump power of 2.56 kW.In the future,fiber laser with higher output power and better beam quality can be realized by increasing the pump power and optimizing the fiber characteristics.

关 键 词：光纤激光器 量子亏损 振荡放大一体化 模式不稳定 

分 类 号：TN242[电子电信—物理电子学]