14μm芯径2 kW光纤振荡器及紫铜焊接试验研究  

Experimental Research on 2 kW Fiber Oscillator with 14μm Core Diameter and Copper Welding

作　　者：郭少锋 代小光 彭杨 代小星 郑文雷 朱朝晖 刘同争 徐志宏 Guo Shaofeng;Dai Xiaoguang;Peng Yang;Dai Xiaoxing;Zheng Wenlei;Zhu Zhaohui;Liu Tongzheng;Xu Zhihong(Hunan Dake Laser Co.,Ltd.,Xiangyin 414615,Hunan,China)

机构地区：[1]湖南大科激光有限公司,湖南湘阴414615

出　　处：《激光与光电子学进展》2022年第21期267-270,共4页Laser & Optoelectronics Progress

摘　　要：激光焊接是新能源电池制造的关键技术。采用976 nm半导体激光泵浦技术,在保证泵浦光充分吸收和激光器光光转换效率的同时,缩短增益光纤长度,提高激光器受激拉曼散射阈值,采用独特的增益光纤盘绕技术抑制模式不稳定,提高输出光束质量,实现了2.25 kW纯单模(M2≤1.1)激光功率输出,拉曼抑制比达到-38 dB,能量传输光纤(芯径为14μm,数值孔径为0.07)长度达到7 m。输出激光亮度高、光斑直径小、功率密度高,有效降低了焊接中的热效应,避免了焊缝缺陷和飞溅。Laser welding is the key technology of new energy battery manufacturing. To ensure the full absorption of pump light and laser light conversion efficiency, 976 nm semiconductor laser pump technology is used, and the length of gain fiber is shortened to increase the laser stimulated Raman scattering threshold. And a novel gain fiber coiling method is provided to suppress the mode instability and improve the output beam quality. The output power of single-mode(M2≤1. 1) laser is 2. 25 kW, the Raman suppression ratio reaches-38 dB, and the length of energy transmission fiber(14 μm core diameter, numerical aperture is 0. 07) reaches 7 m. The output laser has high brightness, small spot diameter, and high power density, which can effectively reduce the thermal effect during welding and avoids weld defects and spatters.

关 键 词：激光器 单模光纤激光器 细芯径 焊接性能 

分 类 号：O436[机械工程—光学工程]