超快超强激光与光纤激光相干合成技术的融合发展(特邀)  

Integrated Development of Ultrafast Ultra-Intense Laser Technology with Fiber Laser Coherent Beam Combination Technology(Invited)

作　　者：李灿 张嘉怡 任博[1] 常洪祥 王涛[1] 郭琨 张雨秋 粟荣涛 冷进勇 许将明 吴坚 周朴[1] Li Can;Zhang Jiayi;Ren Bo;Chang Hongxiang;Wang Tao;Guo Kun;Zhang Yuqiu;Su Rongtao;Leng Jinyong;Xu Jiangming;Wu Jian;Zhou Pu(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86-103,共18页Chinese Journal of Lasers

基　　金：国家重点研发计划(2022YFB3606000);湖南省自然科学基金创新群体项目(2019JJ10005)。

摘　　要：以超短脉冲、超高峰值功率为特征的高强度激光为人类提供了前所未有的实验手段和极端物理条件,在先进制造、高次谐波产生、粒子加速、超高速现象研究等重大科技前沿领域中有广泛的应用需求。然而,受热光效应等因素的影响,目前超快超强激光源的平均功率和重复频率难以提升,与相关应用需求尚存量级上的差距。为获得更高平均功率的超快超强激光,研究人员普遍认为多路光纤激光相干合成是同时实现高峰值功率和高平均功率超短脉冲激光的首选方案。从超快超强激光与光纤激光相干合成技术融合发展的角度,梳理了国内外在近年来的研究进展与发展现状,并对我国基于相干合成技术的高功率超快超强激光领域的发展趋势进行了展望。Significance Characterized by ultrashort pulse and ultra-high peak power,high intense lasers provide unprecedented experimental possibilities and extreme physical conditions for human beings,thus enabling various applications in major scientific and technological frontier fields,such as advanced manufacturing,high-order harmonic generation,particle acceleration,and ultra-high-speed phenomenon research.However,owing to limitations by the thermo-optic effect,scaling the average power and repetition frequency of ultrafast intense lasers is challenging,and discrepancy by an order of magnitude exists between the current technologies and the relevant application requirements(Fig.1).To achieve ultrafast intense lasers with higher average power,researchers have adopted multichannel fiber-laser coherent-beam combination(CBC)to generate ultrashort laser pulses with high peak and average power levels simultaneously.Specifically,owing to the merits of large surface-to-volume ratio and excellent thermal optical performance endowed by the unique waveguide structure of optical fiber,fiber lasers can realize a high conversion efficiency(electro-optical efficiency exceeding 30%)via a flexible and compact configuration,which is beneficial for implementing a multichannel CBC system.Nevertheless,demonstrating the CBC of ultrafast fiber lasers is extremely challenging owing to the requirement of high precision control of multidimensional parameters such as delay,phase,beam pointing,and polarization.Over the past 15 years,significant efforts have been devoted to address those issues,and significant progresses have been achieved regarding the average power and energy scaling of ultrafast fiber-laser CBC systems.Specifically,the development of time-domain CBC and multidimensional parameter control technologies for fiber lasers has further enhanced CBC,thus reflecting the integrated development of ultrafast intense lasers technology and fiber-laser CBC technology.Based on this perspective,the research progress and development status pert

关 键 词：超快激光 光纤激光 相干合成 高功率激光 

分 类 号：O436[机械工程—光学工程]