High beam quality 10 kW light source based on thin-film beam combination

Dongdong Li; Xinshang Niu; Xiaochuan Ji; Hongfei Jiao; Jinlong Zhang; Yujie Xing; Jian Zhang; Xiong Dun; Xinbin Cheng; Zhanshan Wang

doi:10.1017/hpl.2024.43

High Power Laser Science and Engineering (Jan 2024)

High beam quality 10 kW light source based on thin-film beam combination

Dongdong Li,
Xinshang Niu,
Xiaochuan Ji,
Hongfei Jiao,
Jinlong Zhang,
Yujie Xing,
Jian Zhang,
Xiong Dun,
Xinbin Cheng,
Zhanshan Wang

Affiliations

Dongdong Li: Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China Shanghai Frontiers Science Center of Digital Optics, Shanghai, China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, China
Xinshang Niu: ORCiD; Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China Shanghai Frontiers Science Center of Digital Optics, Shanghai, China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, China
Xiaochuan Ji: Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China Shanghai Frontiers Science Center of Digital Optics, Shanghai, China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, China
Hongfei Jiao: ORCiD; Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China Shanghai Frontiers Science Center of Digital Optics, Shanghai, China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, China
Jinlong Zhang: ORCiD; Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China Shanghai Frontiers Science Center of Digital Optics, Shanghai, China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, China
Yujie Xing: Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China Shanghai Frontiers Science Center of Digital Optics, Shanghai, China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, China
Jian Zhang: Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China Shanghai Frontiers Science Center of Digital Optics, Shanghai, China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, China
Xiong Dun: Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China Shanghai Frontiers Science Center of Digital Optics, Shanghai, China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, China
Xinbin Cheng: ORCiD; Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China Shanghai Frontiers Science Center of Digital Optics, Shanghai, China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, China
Zhanshan Wang: ORCiD; Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai, China Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai, China Shanghai Frontiers Science Center of Digital Optics, Shanghai, China Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications, Shanghai, China

DOI: https://doi.org/10.1017/hpl.2024.43
Journal volume & issue: Vol. 12

Abstract

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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 M2 x = 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.

Published in High Power Laser Science and Engineering

ISSN: 2095-4719 (Print); 2052-3289 (Online)
Publisher: Cambridge University Press
Country of publisher: United Kingdom
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics
Website: https://www.cambridge.org/core/journals/high-power-laser-science-and-engineering

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