Mitigation of mode instability in laser oscillators based on deuterium loading

Ytterbium-doped fiber (YDF) loaded with deuterium is used herein to mitigate mode instability. Experimental results reveal that this method can increase the mode instability threshold in a laser oscillator. Specifically, when the YDF was loaded with deuterium over two- and four-week periods, the mod...

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Bibliographic Details
Published in:Optics express 2019-09, Vol.27 (18), p.25964-25973
Main Authors: Chen, Yisha, Xu, Haozhen, Xing, Yingbin, Chen, Gui, Cao, Ruiting, Liao, Lei, Wang, Yibo, Li, Haiqing, Peng, Jinggang, Yang, Luyun, Dai, Nengli, Li, Jinyan
Format: Article
Language:English
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Summary:Ytterbium-doped fiber (YDF) loaded with deuterium is used herein to mitigate mode instability. Experimental results reveal that this method can increase the mode instability threshold in a laser oscillator. Specifically, when the YDF was loaded with deuterium over two- and four-week periods, the mode instability threshold power increased from ∼459 W to ∼533 W (16%) and to ∼622 W (35%), respectively, but the respective laser efficiencies were almost unaffected (71.5% vs. 72.9% and 75.4%). In conclusion, deuterium loading is effective in the mitigation of mode instability. It is envisaged to be applied in the power scaling of high-power fiber lasers.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.27.025964