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19 November 2019 Effective mitigation of mode instability by deuterium loading in Yb-doped fiber oscillator
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Abstract
In this work, deuterium loaded Yb-doped fiber has been proposed to mitigate mode instability in laser oscillator. Experimental results reveal that mode instability threshold power rises from ~459W to ~533W and ~622W at the condition of pristine fiber and fiber loaded with deuterium for 2 weeks and 4 weeks respectively. Mode instability threshold power is raised by more than 16% and 35% after 2 and 4 weeks deuterium loading compared to pristine fiber respectively, and laser slope efficiency is not affected by deuterium loading. The experimental results indicate that deuterium loading is effective in mode instability mitigation and showing potentials in further power scaling of high power fiber lasers.
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Yi-sha Chen, Hao-zhen Xu, Ying-bin Xing, Gui Chen, Rui-ting Cao, Yi-bo Wang, Hai-qing Li, Jing-gang Peng, Lu-yun Yang, Neng-li Dai, and Jin-yan Li "Effective mitigation of mode instability by deuterium loading in Yb-doped fiber oscillator", Proc. SPIE 11181, High-Power Lasers and Applications X, 111810U (19 November 2019); https://doi.org/10.1117/12.2537199
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