Frontiers in Physics (Apr 2023)
Dynamic modal characteristics of transverse mode instabilities in ytterbium-doped fiber laser oscillator
- Junyu Chai,
- Junyu Chai,
- Junyu Chai,
- Wenguang Liu,
- Wenguang Liu,
- Wenguang Liu,
- Yujun Wen,
- Yujun Wen,
- Yujun Wen,
- Xiaolin Wang,
- Xiaolin Wang,
- Xiaolin Wang,
- Kun Xie,
- Qiong Zhou,
- Qiong Zhou,
- Qiong Zhou,
- Hanwei Zhang,
- Hanwei Zhang,
- Hanwei Zhang,
- Jiangbin Zhang,
- Jiangbin Zhang,
- Jiangbin Zhang,
- Pengfei Liu,
- Pengfei Liu,
- Pengfei Liu,
- Dan Zhang,
- Dan Zhang,
- Dan Zhang,
- Yao Lu,
- Yao Lu,
- Yao Lu,
- Zongfu Jiang,
- Zongfu Jiang,
- Zongfu Jiang,
- Guomin Zhao,
- Guomin Zhao,
- Guomin Zhao
Affiliations
- Junyu Chai
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Junyu Chai
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Junyu Chai
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Wenguang Liu
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Wenguang Liu
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Wenguang Liu
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Yujun Wen
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Yujun Wen
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Yujun Wen
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Xiaolin Wang
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Xiaolin Wang
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Xiaolin Wang
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Kun Xie
- Xi’an Satellite Control Center, Xi’an, China
- Qiong Zhou
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Qiong Zhou
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Qiong Zhou
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Hanwei Zhang
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Hanwei Zhang
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Hanwei Zhang
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Jiangbin Zhang
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Jiangbin Zhang
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Jiangbin Zhang
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Pengfei Liu
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Pengfei Liu
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Pengfei Liu
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Dan Zhang
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Dan Zhang
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Dan Zhang
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Yao Lu
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Yao Lu
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Yao Lu
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Zongfu Jiang
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Zongfu Jiang
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Zongfu Jiang
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- Guomin Zhao
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Guomin Zhao
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Guomin Zhao
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
- DOI
- https://doi.org/10.3389/fphy.2023.1181692
- Journal volume & issue
-
Vol. 11
Abstract
In recent years, transverse mode instability (TMI) has been widely observed in fiber laser amplifier systems. The transverse mode instability phenomenon in fiber laser oscillators is less studied. Here, we focus on the dynamical output properties, i.e., its temporal signal and modal characteristics in a 30-μm-core-diameter ytterbium (Yb)-doped fiber laser oscillator. The TMI occurs at a pumping power around 310 W. Different from amplifiers, the basic oscillation frequency is quite low, at around 100 Hz, changing with time and pump power. When the fiber laser oscillator operates beyond TMI threshold at 357 W or 377 W for a while, the temporal fluctuation slowly disappears together with a decreased oscillation frequency, and appears again later. Based on the mode decomposition technique, we find that during the period of fluctuation disappearance at 357 W, the power output stays low and the output beam is still a mixture of fundamental mode and higher-order modes. The fundamental mode content is calculated to be averagely higher when temporal fluctuation disappears, increasing from ∼57% to ∼63%. Our results indicate complex interaction between the fiber laser oscillation and the TMI effect, and calls for more attention into understanding TMI in fiber laser oscillators.
Keywords
- transverse mode instability
- fiber laser oscillator
- modal coupling
- refractive index gratings
- modal interference pattern
