掺Tm光纤MOPA准相位匹配单程倍频的单频激光器  

Single-frequency laser based on single-pass QPM frequency doubling of Tm-doped fiber MOPA

作　　者：张鹏泉 杜铁钧[1] 史屹君 Zhang Pengquan;Du Tiejun;Shi Yijun(School of Electronics and Information,Hangzhou Dianzi University,Hangzhou 310018,China;Tianjin Bright Star Technology Co.,LTD,Tianjin 300192,China)

机构地区：[1]杭州电子科技大学电子信息学院,浙江杭州310018 [2]天津可宏振星科技有限公司,天津300192

出　　处：《红外与激光工程》2020年第7期104-108,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金(61501153)。

摘　　要：为获得0.9μm近红外波段连续波单频激光输出,用50 mm长的PPLN晶体对掺Tm光纤激光MOPA的连续波1925.08 nm单频激光输出进行单程倍频,通过聚焦参数和准相位匹配温度优化,在43.4 W基频光功率实现了最高9.07 W的962.5 nm二次谐波输出,转换效率达到20.9%。二次谐波为单纵模运转,水平和竖直方向光束质量因子分别为1.36和1.52。实验中研究了聚焦因子和相位匹配温度对倍频转换效率的影响,并讨论了聚焦条件和准相位匹配温度带宽之间的相互关系。实验结果表明:Tm光纤激光准相位匹配单程倍频是获得0.9μm波段连续波单频激光输出的有效方法。In order to obtain a 0.9μm near-infrared continuous-wave single-frequency laser output,a 50 mm long PPLN crystal was used to perform single-pass frequency doubling of the continuous-wave 1925.08 nm single-frequency laser output of the Tm-doped fiber MOPA,and the temperature was matched by focusing parameters and quasi-phase optimized to achieve 96.95 nm second harmonic output up to 9.07 W at a fundamental optical power of 43.4 W,with a conversion efficiency of 20.9%.The second harmonic was in single longitudinal mode with M2 factors of 1.36 and 1.52 on x and y directions,respectively.The influence of focusing parameter and temperature on the conversion efficiency was experimentally investigated.The relationship between the focusing parameter and phase matching temperature acceptance was also discussed.The experimental results show that Tm-doped fiber laser quasi-phase matching one-way frequency doubling is an effective method to obtain 0.9μm band continuous wave single frequency laser output.

关 键 词：单频激光器 连续波激光器 准相位匹配 单程倍频 掺铥光纤激光器 周期极化铌酸锂 

分 类 号：TN248.1[电子电信—物理电子学]