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

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

机构地区：[1]Institute of Precision Optical Engineering,School of Physics Science and Engineering,Tongji University,Shanghai,China [2]Key Laboratory of Advanced Micro-structured Materials,Ministry of Education,Tongji University,Shanghai,China [3]Shanghai Frontiers Science Center of Digital Optics,Shanghai,China [4]Shanghai Professional Technical Service Platform for Full-Spectrum and High-Performance Optical Thin Film Devices and Applications,Shanghai,China

出　　处：《High Power Laser Science and Engineering》2024年第5期13-21,共9页高功率激光科学与工程(英文版)

基　　金：supported by the National Natural Science Foundation of China (Nos. 62061136008, 62275196, 62192772, 62305251, 61925504, 61975153, 6201101335, 62020106009, 62192770 and 61621001);Science and Technology Commission of Shanghai Municipality (Nos. 17JC1400800, 20JC1414600 and 21JC1406100);Special Development Funds for Major Projects of Shanghai Zhangjiang National Independent Innovation Demonstration Zone (No. ZJ2021-ZD-008);Shanghai Municipal Science and Technology Major Project (No. 2021SHZDZX0100);Fundamental Research Funds for the Central Universities;National Key R&D Program of China (No. 2022YFA1603403)。

摘　　要：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 of3 kW fiber lasers was achieved,and an output power of 11.4 kW with a beam quality of M_(x)^(2)=1.601 and M_(y)^(2)=1.558using 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.

关 键 词：10 kW light source beam quality overlapping precision temperature rise thin-film beam combining technology 

分 类 号：TN2[电子电信—物理电子学]