LD泵浦新型高功率掺镱光纤激光器研究(特邀)  

Directly LD Pumped Novel High Power Ytterbium-Doped Fiber Laser(Invited)

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

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

出　　处：《中国激光》2024年第19期215-229,共15页Chinese Journal of Lasers

基　　金：国家重点研发计划(2022YFB3606000);湖南省杰出青年基金(2023JJ10057);长沙市杰出创新青年培养计划(kq2305038);基础科研计划(JCXX2021525B015)。

摘　　要：LD泵浦掺镱光纤激光器具有高功率、高效率、高光束质量等优点,在工业、科研等领域有着广阔的应用前景。随着工业等领域对激光器体积、重量、成本、可靠性等要求的提高,满足相关需求的光纤激光器应运而生。面向工业领域高功率和特殊领域高亮度的需求,笔者所在课题组提出了评估激光器性能的成本-体积-重量-功率比(CSWpP)和成本-体积-重量-亮度比(CSWpB)的概念,并对当前可降低CSWpP和CSWpB的各种激光器的结构进行了对比分析。重点介绍了满足低CSWpB和低CSWpP要求的LD泵浦双端输出光纤激光器和振荡放大一体化光纤激光器等新型光纤激光器的原理与优势。给出了两种新型光纤激光器的理论模型,并进行了仿真分析;同时,重点报道了2×5 kW双端输出光纤激光器、10 kW振荡放大一体化光纤激光器和2×4 kW近单模振荡放大一体化双端输出光纤激光器的最新研究结果。Objective Fiber lasers have advantages,such as high conversion efficiency,good beam quality,convenient thermal management,and flexible transmission.They are widely used in industrial processing,national defense research,and other fields.In recent years,with the development of fiber technology,fiber devices,and pump source technology,the output power of high-power fiber lasers has been rapidly improved.Currently,the output power of the fiber oscillator exceeds 9 kW.For fiber amplifiers,solutions with an output power exceeding 10 kW have become more mature,and multiple research teams have reported on fiber amplifiers with an output power exceeding 20 kW.With the increasing demand for laser size,weight,cost,and reliability in industries and other fields,the traditional concept of size,weight,and power(SWaP)is gradually becoming unsuitable for a wide range of application scenarios.Moreover,it is difficult to simultaneously consider multiple application scenarios using traditional fiber oscillators and amplifiers.Now,bidirectional output fiber laser(BOFL)and oscillating-amplifying integrated fiber lasers(OAIFL)are quickly receiving widespread attention as new structure fiber lasers,with obvious advantages in efficiency,nonlinear effect suppression,transverse mode instability(TMI)suppression,system size,cost,and weight.Currently,a BOFL can achieve a 2×4 kW laser output,and an OAIFL can achieve a 6 kW high beam quality laser output.In this study,we introduce new indicators with which to evaluating the performance of fiber lasers:cost‒size‒weight per unit power(CSWpP)and cost‒size‒weight per unit brightness(CSWpB).In addition,we analyze the application potential of the two new structure fiber lasers in different demand scenarios via theoretical and experimental methods.Methods First,based on the rate equation system of fiber lasers,the theoretical models of BOFL and OAIFL are established.Based on theoretical models,the advantages of the two new structure fiber lasers are analyzed in terms of efficiency,temperatu

关 键 词：光纤激光器 LD泵浦 成本-体积-重量-功率比 振荡放大一体化光纤激光器 双端输出光纤激光器 

分 类 号：O436[机械工程—光学工程]