摘要
半导体直接泵浦的短波长高亮度掺镱光纤激光器在非线性变频、光纤级联泵浦等方面有着十分重要的应用。基于大模场掺镱光纤搭建了全光纤结构的1035 nm光纤激光主振荡功率放大系统,实现了2040 W的最高功率输出,斜率效率约为70%,最高输出功率下x和y方向的光束质量因子(M_(2))分别为1.33和1.22,放大自发辐射抑制比为32 dB,是目前报道的输出功率最高的1035 nm波段近单模简单MOPA结构光纤激光器。
[Background]The 1035 nm short-wavelength-band fiber laser serves as a critically important light source with extensive and growing applications across numerous advanced technological fields.Its unique spectral properties make it highly suitable for spectral beam combining(SBC),nonlinear frequency conversion,and highresolution lidar systems.However,the power scaling of 1035 nm fiber lasers has long been constrained by the amplified spontaneous emission(ASE)effect.This phenomenon has historically impeded significant progress,with the output power from conventional master oscillator power amplifier(MOPA)configurations remaining confined below 2 kW,creating a bottleneck for higher-performance applications.[Purpose]To realize high-power,high-brightness laser output in the 1035 nm band,we designed and constructed a counter-pumped MOPA fiber laser.[Methods]The system’s performance was enhanced through multi-parameter optimization,including optimizing the temporal characteristics of the fiber seed source,the bending and coiling parameter of the gain fiber in the amplifier stage,and refining the backward pump scheme.[Results]Finally,when the seed laser power was 24 W and the total pump power was 2.9 kW,a maximum output power of over 2 kW was reached,and the corresponding optical-to-optical conversion efficiency of the amplifier stage was approximately 69.5%.At the maximum output power,the ASE suppression ratio was measured to be around 32 dB,indicating effective control over noise.Furthermore,the beam quality factors were measured to be M_(x)^(2)M_(y)^(2)=1.33 and=1.22,confirming near-diffraction-limited,single-mode operation,and high spatial beam quality.[Conclusions]The results represent a significant stride forward in the power scaling of high-brightness 1035 nm fiber lasers.Next research will focus on further elevating the output power and beam quality by implementing seed source with more stable temporal characteristics and optimizing the overall fiber laser structure to mitigate ASE and other nonlinear effects.
作者
王鹏
杨成
吴函烁
叶云
奚小明
张汉伟
王小林
习锋杰
Wang Peng;Yang Cheng;Wu Hanshuo;Ye Yun;Xi Xiaoming;Zhang Hanwei;Wang Xiaolin;Xi Fengjie(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,Changsha 410073,China)
出处
《强激光与粒子束》
北大核心
2025年第9期1-3,共3页
High Power Laser and Particle Beams
基金
长沙市杰出创新青年培养计划项目(kq2406002)
国防科技大学自主创新科学基金项目(25-ZZCX-XXXJS-3)
国防科技大学自主科研项目(202301-XXGC-XX-045)。
关键词
掺镱光纤激光器
短波光纤激光器
放大自发辐射
ytterbium-doped fiber laser
short-wavelength fiber laser
amplified spontaneous emission
作者简介
王鹏,1169723259@qq.com;通信作者:王小林,chinaphotonics@163.com;通信作者:习锋杰,xifengjie@163.com。
