Dongdong Li1,2,3,4, Xinshang Niu1,2,3,4, Xiaochuan Ji1,2,3,4, Hongfei Jiao1,2,3,4..., Jinlong Zhang1,2,3,4,*, Yujie Xing1,2,3,4, Jian Zhang1,2,3,4, Xiong Dun1,2,3,4, Xinbin Cheng1,2,3,4 and Zhanshan Wang1,2,3,4|Show fewer author(s)
Author Affiliations
1Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China2Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China3Shanghai Frontiers Science Center of Digital Optics, Shanghai, China4Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, Chinashow less
DOI: 10.1017/hpl.2024.43
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Dongdong Li, Xinshang Niu, Xiaochuan Ji, Hongfei Jiao, Jinlong Zhang, Yujie Xing, Jian Zhang, Xiong Dun, Xinbin Cheng, Zhanshan Wang, "High beam quality 10 kW light source based on thin-film beam combination," High Power Laser Sci. Eng. 12, 05000e55 (2024)
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Abstract
Thin-film beam combining technology is an effective approach to improve output power while maintaining beam quality. However, the lack of comprehensive research into the key factors affecting the beam quality in systems makes it challenging to achieve a practical combined beam source with high brightness. This paper clearly established that the temperature rise of dichroic mirrors (DMs) and sub-beam overlapping precision are the main factors affecting the beam quality of the system, with quantified effects. Based on this understanding, a combined light source of four channels of 3 kW fiber lasers was achieved, and an output power of 11.4 kW with a beam quality of M2x = 1.601 and M2y = 1.558, using three high-steepness low-absorption DMs and the active control technique. To the best of our knowledge, this is the best beam quality for a 10 kW light source. This study offers a solution for practical high-power laser sources in the tens of kilowatts range.
