Frontiers in Physics (May 2023)
High-speed modal analysis of dynamic modal coupling in fiber laser oscillator
- Junyu Chai,
- Junyu Chai,
- Junyu Chai,
- Wenguang Liu,
- Wenguang Liu,
- Wenguang Liu,
- Xiaolin Wang,
- Xiaolin Wang,
- Xiaolin Wang,
- Qiong Zhou,
- Qiong Zhou,
- Qiong Zhou,
- Kun Xie,
- Yujun Wen,
- Yujun Wen,
- Yujun Wen,
- Jiangbin Zhang,
- Jiangbin Zhang,
- Jiangbin Zhang,
- Pengfei Liu,
- Pengfei Liu,
- Pengfei Liu,
- Hanwei Zhang,
- Hanwei Zhang,
- Hanwei Zhang,
- Dan Zhang,
- Dan Zhang,
- Dan Zhang,
- 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, 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, 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, Changsha, 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, Changsha, China
- Kun Xie
- Xi’an Satellite Control Center, Xi’an, 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, 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, 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, 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, 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, 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, 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, Changsha, China
- DOI
- https://doi.org/10.3389/fphy.2023.1146208
- Journal volume & issue
-
Vol. 11
Abstract
Up till now, the spatial and temporal dynamics of transverse mode instability (TMI) in fiber laser oscillator have increasingly attracted a worldwide attention. Here, we develop a high-speed modal decomposition (MD) system to analyze the modal coupling for fiber laser oscillator above the TMI threshold. A set of angular-multiplexing transmission functions (TFs) are designed for simultaneous MD and monitoring the far-field beam profile. The TMI threshold of the deployed fiber laser oscillator is 181 W at a co-pumping power (CPP) of 279 W. As the CPP increases from 318 W to 397 W, the power fluctuations of the output laser become more drastic. The changes of the far-field beam profile and the centroid of far-field spot (COFFS) indicate an increased velocity of energy transfer between modes. The high-speed MD verifies above process and analyzes the modal components, indicating that the single cycle of modal coupling decreases from 11 ms to 4 ms. Otherwise, the strong mode coupling occurs between modes with relatively large weights. The high-speed MD provides a powerful tool to research the TMI effect.
Keywords
- transverse mode instability
- mode decomposition
- modal coupling
- fiber laser
- optical correlation filter
