基于915nm半导体激光单端前向抽运的单纤准单模2kW全光纤激光振荡器  

Single Fiber Quasi-Single Mode 2 kW All-Fiber Laser Oscillator Based on Single-End 915 nm Semiconductor Laser Forward-Pumping

作　　者：许阳 房强 谢兆鑫 李锦辉 崔雪龙 史伟[3,2] Xu Yang;Fang Qiang;Xie Zhaoxin;Li Jinhui;Cui Xuelong;Shi Wei(HFB Photonics Co. Ltd. , Weihai, Shandong 264209, China;College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China;Tianjin Institute of Modern Laser ＆ Optics Technology, Tianjin 300384, China)

机构地区：[1]山东海富光子科技股份有限公司,山东威海264209 [2]天津市现代激光与光学研究院,天津300384 [3]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《中国激光》2018年第4期38-42,共5页Chinese Journal of Lasers

基　　金：山东省自然科学基金(ZR2014FP015)

摘　　要：设计了一种基于915nm半导体激光单端抽运的单纤准单模全光纤激光振荡器,其工作波长为1080nm,输出功率可达2.02kW。结合理论和实验,研究了增益光纤长度、受激拉曼散射(SRS)和输出功率之间的关系。通过对增益光纤长度进行优化,在保证大于2kW激光功率的前提下,实现了高SRS抑制比的激光输出,输出激光中SRS功率占比约为0.8%。180min内激光器的功率不稳定度小于±1%,光-光转换效率约为70%。通过合理设计光纤盘绕,有效抑制了光纤中光的高阶模式,在满功率输出时成功地获得了准单模激光(光束质量因子M2≈1.5),并对该激光器在激光切割中的应用进行了研究。We design a single fiber quasi-single mode all-fiber laser oscillator based on single-end 915 nm semiconductor laser forward-pumping,which produces 2.02 kW output power at 1080 nm. We study the relationship among the gain fiber length,stimulated Raman scattering（SRS）,and the output power theoretically and experimentally.We optimize the length of the gain fiber to achieve a laser with a high SRS suppression ratio of0.8 %,which has an output power of more than 2 kW.The optical to optical conversion efficiency of the laser oscillator is about 70%,and the power fluctuation is less than ±1% within 180 min running.The fiber coiling technique is adopted to effectively depress the high-order laser modes to obtain a quasi-single-mode laser（beam quality factor M2≈1.5）at the maximum output power.What is more,the application of the laser in laser cutting is investigated.

关 键 词：激光器 激光谐振器 915nm抽运 单端前向抽运 准单模激光器 

分 类 号：TN248.1[电子电信—物理电子学]