Mitigating transverse mode instability in fiber laser oscillator by employing direct pump modulation

Frontiers in Physics

Physics

Jiangbin Zhang¹  Zongfu Jiang¹  Xiaolin Wang¹  Qiong Zhou¹  Guomin Zhao¹  Yao Lu¹  Junyu Chai¹  Wenguang Liu¹  Pengfei Liu¹  Dan Zhang¹  Hanwei Zhang¹ 

[1] College of Advanced Interdisciplinary Studies, Changsha, China;Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China;Hunan Provincial Key Laboratory of High Energy Laser Technology, Changsha, China;

关键词: fiber laser;    transverse mode instability;    thermal-optical effect;    pump modulation;    beam stability;   

DOI  :  10.3389/fphy.2023.1212811

 received in 2023-04-27, accepted in 2023-06-21,  发布年份 2023

来源: Frontiers

【 摘 要 】

The transverse mode instability (TMI) is a thermal-optical effect, inducing a sudden deterioration of beam quality and average power. This non-linear effect will greatly limit the power scaling of fiber lasers. We demonstrate a direct pump modulation to mitigate TMI in a 30 μm-core-diameter all-fiber laser oscillator. It only relies on function generator and pump drivers without the need of feedback control units. The groups of pump LDs and pump drivers and the phase difference between the channels of function generator have a great impact on the beam stability. Compared with the TMI threshold 180 W in continuous wave (CW) mode, the maximum average output power of a stabilized beam is increased up to 310 W via a multi-parameter-based direct pump modulation.

【 授权许可】

Unknown   
Copyright © 2023 Chai, Liu, Wang, Zhou, Zhang, Liu, Zhang, Lu, Zhang, Jiang and Zhao.