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Numerical modeling of the thermally induced core laser leakage in high power co-pumped ytterbium doped fiber amplifier

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Abstract

We propose a novel model to explain the physical process of the thermally induced core laser leakage (TICLL) effect in a high power co-pumped ytterbium doped fiber (YDF) amplifier. This model considers the thermally induced mode bending loss decrease and the thermally induced mode instability (TMI) in the coiled YDF, and is further used to reproduce the TICLL effect in the high power co-pumped step-index $20/400$ fiber amplifier. Besides, the TICLL effect in the co-pumping scheme and counter-pumping scheme is compared. The result proves that the TICLL effect is caused by the combined effect of the thermally induced mode bending loss decrease and the TMI, and could be mitigated by adopting the counter-pumping scheme. To our best knowledge, this is the first theoretical explanation of the TICLL effect in high power fiber amplifier.

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DOI:10.1017/hpl.2018.15

基金项目:The authors thank the support of National Natural Science Foundation of China (NSFC) (No. 61605246).

收稿日期:2017-11-30

录用日期:2018-01-31

网络出版日期:2018-03-07

作者单位    点击查看

Lingchao Kong:College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China
Jinyong Leng:College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China
Pu Zhou:College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China
Zongfu Jiang:College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, ChinaHunan Provincial Key Laboratory of High Energy Laser Technology, Changsha 410073, ChinaHunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China

联系人作者:Jinyong Leng(lengjy@sina.com)

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引用该论文

Lingchao Kong, Jinyong Leng, Pu Zhou, and Zongfu Jiang, "Numerical modeling of the thermally induced core laser leakage in high power co-pumped ytterbium doped fiber amplifier," High Power Laser Science and Engineering 6(2), e25 (2018)

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