Optimization and Demonstration of Direct LD Pumped High-Power Fiber Lasers to Balance SRS and TMI Effects
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Published:2023-05-06
Issue:5
Volume:10
Page:539
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ISSN:2304-6732
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Container-title:Photonics
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language:en
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Short-container-title:Photonics
Author:
Zeng Lingfa1, Wang Xiaolin123, Wang Li1, Ye Yun1, Wang Peng123, Yang Baolai123, Xi Xiaoming123, Pan Zhiyong123, Zhang Hanwei123, Shi Chen123, Han Kai123, Xu Xiaojun123
Affiliation:
1. College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China 2. Nanhu Laser Laboratory, National University of Defense Technology, Changsha 410073, China 3. Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China
Abstract
Up to now, transverse mode instability (TMI) and stimulated Raman scattering (SRS) have become the main factors limiting the power scaling of conventional ytterbium-doped fiber laser. Many technologies are proposed to suppress the SRS or TMI individually, but most of them are contradictions in practical application. In this article, we focus on the technologies that can balance the suppression of both SRS and TMI, including fiber coiling optimization, pump wavelength optimization, pump configuration optimization, and novel vary core diameter active fiber. Firstly, we validate the effectiveness of these technologies in both theoretical and relatively low-power experiments, and introduce the abnormal TMI threshold increasing in a few-mode fiber amplifier with fiber coiling. Then, we scale up the power through various types of fiber lasers, including wide linewidth and narrow linewidth fiber lasers, as well as quasi-continuous wave (QCW) fiber lasers. As a result, we achieve 5~8 kW fiber laser oscillators, 10~20 kW wide linewidth fiber laser amplifiers, 4 kW narrow linewidth fiber amplifiers, and 10 kW peak power QCW fiber oscillators. The demonstration of these new technical schemes is of great significance for the development of high-power fiber lasers.
Funder
Funds for Distinguished Youth of Hunan Provence Training Program for Excellent Young Innovations of Changsha Basic Scientific Research Program
Subject
Radiology, Nuclear Medicine and imaging,Instrumentation,Atomic and Molecular Physics, and Optics
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