摘要
LD泵浦掺镱光纤激光器具有低成本、高效率、高光束质量等优点,在工业、科研、国防等领域有着广泛的应用。在大部分实际应用中,由功率和光束质量决定的亮度是影响光纤激光器实际作用性能的核心指标。受到非线性效应(尤其是受激拉曼散射)和模式不稳定效应的限制,当前高亮度掺镱光纤激光器输出功率提升遭遇了明显的技术瓶颈。为了抑制非线性效应和模式不稳定效应,在传统方法的基础上,提出了变纤芯直径光纤和优化泵浦波长等成体系的方法以提升光纤激光器的输出功率;为了有效提高对光纤激光器的设计研发能力,提出并开发了具有自主知识产权的光纤激光仿真软件SeeFiberLaser。首先,介绍了影响宽谱高功率掺镱光纤激光器亮度提升的主要限制因素,给出了各个限制因素的抑制方法;其次,利用自研光纤激光仿真软件SeeFiberLaser对提升光纤激光器功率的方法进行优化设计,并对工业常用的振荡器和高亮度光纤激光放大器进行仿真优化;然后,介绍课题组采用后向泵浦、变纤芯直径光纤和优化泵浦波长等方法提升激光功率,实现的6~10 kW高亮度功率光纤激光器;最后,对更高亮度光纤激光器的技术方案进行讨论和展望,提出了无源器件集成化、增益传能光纤一体化等思路,提出了基于变纤芯直径增益传能一体化光纤和集成化无源器件的新型高功率近单模光纤激光器技术方案。
Significance Direct LD pumped high power fiber lasers have the advantages of low cost,high conversion efficiency,and good beam quality,finding applications as diverse as industrial processing,medical treatment and fundamental research,etc.The brightness,which is determined by the output power and beam quality,is a crucial parameter of fiber lasers that affects the application effectiveness.However,the power scaling of high-brightness fiber lasers is mainly constrained by the nonlinear effects and the transverse mode instability(TMI).It is noteworthy that IPG Photonics announced the 10 kW and 20 kW single-mode fiber laser in 2009 and 2013,respectively,but no domestic fiber laser products with>6 kW output power and beam quality factor M2<2.0 are commercially available until now(Mar.2023).There are multiple reasons for the huge gap between the domestic high-brightness fiber laser industry and its foreign counterparts.In addition to the late start time and the less advanced material processing technology,the lack of theoretical guidance and original theoretical-based solutions make it difficult to overcome the technical bottleneck for power scaling of high-brightness fiber lasers,and the lack of fiber laser simulation software also slowed down the process from fundamental research and laboratory demonstration to industrial products.Therefore,it is of significant necessity to develop fiber laser software to aid the fiber laser design and accelerate the process from simulation results to industrial products.Progress To overcome the aforementioned difficulties,researchers from National University of Defense Technology have conducted fundamental theoretical research and developed fiber laser simulation software SeeFiberLaser with independent intellectual property rights.The software can simulate the generation,amplification and transmission of fiber lasers with different time domain characteristics and effects such as amplified spontaneous radiation,stimulated Raman scattering(SRS),stimulated Brillouin scattering and tra
作者
王小林
王鹏
吴函烁
叶云
曾令筏
杨保来
奚小明
张汉伟
史尘
习锋杰
王泽锋
韩凯
周朴
许晓军
陈金宝
Wang Xiaolin;Wang Peng;Wu Hanshuo;Ye Yun;Zeng Lingfa;Yang Baolai;Xi Xiaoming;Zhang Hanwei;Shi Chen;Xi Fengjie;Wang Zefeng;Han Kai;Zhou Pu;Xu Xiaojun;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)
出处
《红外与激光工程》
EI
CSCD
北大核心
2023年第6期103-131,共29页
Infrared and Laser Engineering
基金
湖南省杰出青年基金(2023JJ10057)
长沙市杰出创新青年培养计划(kq2206006)
基础科研计划(JCKY2021525B015)。
关键词
光纤激光器
非线性效应
模式不稳定
激光亮度
仿真软件
fiber lasers
nonlinear effects
mode instability
laser brightness
simulation software
