Impact of bend-induced mode distortion on mode instability in high power fiber amplifiers

Qiuhui Chu; Rumao Tao; Honghuan Lin; Jianjun Wang; Feng Jing

doi:10.1117/12.2564812

17 April 2020 Impact of bend-induced mode distortion on mode instability in high power fiber amplifiers

Qiuhui Chu, Rumao Tao, Honghuan Lin, Jianjun Wang, Feng Jing

Proceedings Volume 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications; 1145545 (2020) https://doi.org/10.1117/12.2564812
Event: Sixth Symposium on Novel Photoelectronic Detection Technology and Application, 2019, Beijing, China

Abstract

In this paper, the model to simulate the impact of bend induced mode distortion on the beam quality and mode instability (MI) threshold of fiber amplifier is established, and the results show that the bend induced mode distortion will degrade the beam quality of fiber laser and decrease the MI threshold. The bend induced mode distortion will change the gain of active fiber, then destroy the beam quality of fiber amplifier, and decrease the MI threshold, but the bend loss will suppress high order mode. Therefore, with the decreasing of fiber bend radius, the MI threshold will decrease firstly, and then increase.

Citation Download Citation

Qiuhui Chu, Rumao Tao, Honghuan Lin, Jianjun Wang, and Feng Jing "Impact of bend-induced mode distortion on mode instability in high power fiber amplifiers", Proc. SPIE 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications, 1145545 (17 April 2020); https://doi.org/10.1117/12.2564812

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