High Power Laser Science and Engineering, 2018, 6 (4): 04000e57, Published Online: Mar. 21, 2019   

High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression Download: 763次

Author Affiliations
1 College of Advanced Interdisciplinary Studies , National University of Defense Technology , Changsha 410073 , China
2 Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser , National University of Defense Technology , Changsha 410073 , China
Abstract
An all-fiberized and narrow-bandwidth master oscillator power amplification (MOPA) system with record output power of 4 kW level and slope efficiency of 78% is demonstrated. Tandem pumping strategy is tentatively introduced into the narrow-bandwidth MOPA system for thermally induced mode instability (TMI) suppression. The stimulated Brillouin scattering (SBS) effect is balanced by simply using one-stage phase modulation technique. With different phase modulation signals, SBS limited output powers of 336 W, 1.2 kW and 3.94 kW are respectively achieved with spectral bandwidths accounting for 90% power of ${\sim}$ 0.025, 0.17 and ${\sim}$ 0.89 nm. Compared with our previous 976 nm pumping system, TMI threshold is overall boosted to be ${>}$ 5 times in which tandem pumping increases the TMI threshold of ${>}$ 3 times. The beam quality ( $M^{2}$ factor) of the output laser is well within 1.5 below the TMI threshold while it is ultimately saturated to be 1.86 with the influence of TMI at maximal output power. Except for SBS and TMI, stimulated Raman scattering (SRS) effect will be another challenge for further power scaling. In such a high power MOPA system, multi-detrimental effects (SBS, SRS and TMI) will coexist and may be mutual-coupled, which could provide a well platform for further comprehensively investigating and optimizing the high power, narrow-bandwidth fiber amplifiers.

Pengfei Ma, Hu Xiao, Daren Meng, Wei Liu, Rumao Tao, Jinyong Leng, Yanxing Ma, Rongtao Su, Pu Zhou, Zejin Liu. High power all-fiberized and narrow-bandwidth MOPA system by tandem pumping strategy for thermally induced mode instability suppression[J]. High Power Laser Science and Engineering, 2018, 6(4): 04000e57.

本文已被 7 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!