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Greater than 2 kW all-passive fiber Raman amplifier with good beam quality

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Abstract

We report a 2 kW all-fiberized Raman fiber amplifier with efficient brightness enhancement based on the graded-index fiber. The maximum power output reaches up to 2.034 kW centered at 1130 nm, with a conversion efficiency of 79.35% with respect to the injected pump power. To the best of our knowledge, this is the highest conversion efficiency obtained for any Raman laser system using graded-index fiber. An optimized fiber combiner adopting graded-index fiber as the pigtail fiber was fabricated, enabling the preservation of the seeding brightness in the core-pumped Raman fiber amplifier, and further enhancing the ultimate brightness of the output laser after amplification. At the maximum power output, the beam quality parameter M2 is 2.8, corresponding to a signal-to-pump brightness enhancement factor of 11.2. As far as we know, we obtain the highest brightness enhancement among Raman fiber lasers of over 100 W, and the best beam quality for graded-index Raman fiber lasers of over 150 W.

广告组1.2 - 空间光调制器+DMD
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DOI:10.1017/hpl.2020.33

所属栏目:Letters

基金项目:This work was supported by Huo Yingdong Education Foundation (No. 151062), Hunan Provincial Innovation Construct Project (No. 2019RS3017), and National Natural Science Foundation of China (Nos. 11704409 and 61605246).

收稿日期:2020-07-01

录用日期:2020-08-12

网络出版日期:2020-11-18

作者单位    点击查看

Yizhu Chen:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
Tianfu Yao:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
Hu Xiao:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
Jinyong Leng:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
Pu Zhou:College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

联系人作者:Pu Zhou(zhoupu203@163.com)

备注:This work was supported by Huo Yingdong Education Foundation (No. 151062), Hunan Provincial Innovation Construct Project (No. 2019RS3017), and National Natural Science Foundation of China (Nos. 11704409 and 61605246).

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引用该论文

Yizhu Chen, Tianfu Yao, Hu Xiao, Jinyong Leng, and Pu Zhou, "Greater than 2 kW all-passive fiber Raman amplifier with good beam quality," High Power Laser Science and Engineering 8(4), e33 (2020)

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