ORIGINAL RESEARCH article
Front. Phys.
Sec. Optics and Photonics
Volume 13 - 2025 | doi: 10.3389/fphy.2025.1612074
This article is part of the Research TopicAdvanced High Power Solid-State Laser Technology, Volume IIView all 3 articles
Impact of mode instability on polarization extinction ratio in backward pumped fiber amplifiers
Provisionally accepted
Qiang Shu
Chun ZhangFang Li
Qiuhui Chu*Guo ChaoFengyun LiHaoyu Zhang
Rumao Tao*Honghuan LinJianjun Wang- Research Centre of Laser Fusion, China Academy of Engineering physics, Mianyang, China
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The influence of mode instability (MI) on polarization extinction ratio (PER) has been investigated in a 2 kW level polarization-maintained (PM) fiber laser system with backward pumping configuration, and the phenomena is different from the existing observations in forward-pumped PM fiber amplifiers. No decrease in PER was noted with the onset of MI, revealing that the MI effect has little impact on PER in backward-pumped PM fiber amplifiers. The discrepancy induced by the pump configuration has been theoretically analyzed, which is attributed to the longitudinal-distribution difference of high order modes induced by the MI effect.
Keywords: Mode instability, Polarization extinction ratio, polarization-maintained fiber lasers, Nonlinear effect, Backward pump
Received: 15 Apr 2025; Accepted: 12 Jun 2025.
Copyright: © 2025 Shu, Zhang, Li, Chu, Chao, Li, Zhang, Tao, Lin and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Qiuhui Chu, Research Centre of Laser Fusion, China Academy of Engineering physics, Mianyang, China
Rumao Tao, Research Centre of Laser Fusion, China Academy of Engineering physics, Mianyang, China
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