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

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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.

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DOI:10.1017/hpl.2018.51

基金项目:This work is sponsored by the National Natural Science Foundation of China (Nos. 61705264 and 61705265). The authors would like to express sincere thanks to Liang Xiao, Jiawei He, Xiaoyong Xu, and Minyang Liu for their help in the experiment.

收稿日期:2018-07-05

录用日期:2018-08-28

网络出版日期:2018-09-28

作者单位    点击查看

Pengfei Ma:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, National University of Defense Technology, Changsha 410073, China
Hu Xiao:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, National University of Defense Technology, Changsha 410073, China
Daren Meng:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
Wei Liu:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
Rumao Tao:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, National University of Defense Technology, Changsha 410073, China
Jinyong Leng:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, National University of Defense Technology, Changsha 410073, China
Yanxing Ma:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, National University of Defense Technology, Changsha 410073, China
Rongtao Su:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, National University of Defense Technology, Changsha 410073, China
Pu Zhou:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, National University of Defense Technology, Changsha 410073, China
Zejin Liu:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, National University of Defense Technology, Changsha 410073, China

联系人作者:Pengfei Ma(zhoupu203@163.com)

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引用该论文

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

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