Journal
OPTICS EXPRESS
Volume 26, Issue 16, Pages 20430-20441Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.020430
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Funding
- National Key R&D Program of China [2017YFB1104400]
- National Natural Science Foundation of China [61735007]
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The laser performance of a high-power ytterbium-doped fiber amplifier is mainly hindered by the onset of mode instability. In this work, the slope efficiency and mode instability threshold of the ytterbium-doped fiber under various gamma-ray radiation doses has been measured. Experimental results reveal that gamma-ray radiation-induced photodarkening degrades mode instability severely, and gamma-ray radiation-induced mode instability degradation can be partly bleached by hours of pump-light injection. It is shown that gamma-ray radiation-induced photodarkening results in a steep reduction of slope efficiency and mode instability threshold; moreover, the entire irradiated fiber can be partly bleached by hours of pump-light injection and exhibits both time and gamma-ray radiation-dose saturation properties. The experimental results indicate that mode instability mitigation can be partly realized by pump-light injection and implies photodarkening suppression is beneficial for TMI mitigation, which is very promising for the advancement of high-power fiber lasers. (c) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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