基于级联拉曼激光倍频的10 W黄光光纤激光器  

Generation of 10 W Yellow Fiber Laser by Frequency Doubling of Cascaded Raman Laser

作　　者：崔淑珍[1,2] 曾鑫 程鑫 杨学宗[3] 冯衍 Cui Shuzhen;Zeng Xin;Cheng Xin;Yang Xuezong;Feng Yan(Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai Key Laboratory of Solid State Laser and Application,Shanghai 201800,China;University of the Chinese Academy of Sciences,Beijing 100049,China;Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou,Zhejiang 310024,China)

机构地区：[1]中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室,上海201800 [2]中国科学院大学,北京100049 [3]国科大杭州高等研究院,浙江杭州310024

出　　处：《中国激光》2021年第16期50-56,共7页Chinese Journal of Lasers

基　　金：国家重点研发计划(2020YFB1805900,2018YFB0504600);上海市科学技术委员会项目(19441909800)。

摘　　要：报道了一种结构紧凑、成本低、稳定性高、操作简单,可应用于皮肤病学及医疗美容领域的黄光激光器。该激光器采用高功率保偏掺镱光纤激光器泵浦级联拉曼嵌套腔的结构,通过使用窄带宽的1178 nm光纤布拉格光栅以及优化拉曼增益光纤的长度,获得了高功率窄线宽线偏振1178 nm激光。结合基于周期极化钽酸锂晶体的单通倍频方式,实现了10.19 W连续波589 nm激光的输出,倍频效率为18.12%。此外,研制的工程样机功率峰峰值浮动小于2%。Objective Compact,high-power,low-cost yellow lasers at~589 nm have potential in dermatological applications.There is no solid-state gain medium that can directly lase at 589 nm,so nonlinear frequency conversion of nearinfrared laser is an indispensable technology.The yellow solid laser is usually generated by sum mixing from two Nd∶YAG lasers at 1064 nm and 1319 nm,which the multiple-cavity systems are too complex to use.Yb-doped silica fiber has gain at 1178 nm,but lasing at this wavelength is difficult.So,the Raman fiber laser and amplifier are known for their unique advantage of flexibility in wavelength.The common frequency doubling method employs an external enhancement cavity to achieve high-efficiency and high-power frequency doubling.Nevertheless,it adds complexity to the laser system.In this article,we report a compact,low-cost,high-power,narrow-linewidth yellow laser by single-pass frequency doubling of a cascaded Raman fiber laser in a periodically poled MgO-doped nearstoichiometric LiTaO3 crystal(PPSLT).Up to 10.19-W 589-nm laser is obtained with a conversion efficiency of 18.12%,which is limited by the fundamental laser linewidth.To the best of our knowledge,this laser system has the simplest structure,is the easiest to operate,and is the most suitable for commercial use.Methods The experimental configuration of the yellow fiber-based laser is shown in Fig.1,including three functionally different parts—a 1070 nm fiber laser used as a Raman pump source,a cascaded Raman fiber laser,and a single-pass frequency doubling device.The 1070-nm source is a conventional fiber Bragg grating(FBG)-based fiber oscillator.The gain fiber is 10/125-μm polarization-maintaining(PM)Yb-doped fiber(YDF).Using one1070/1120-nm wavelength division multiplexing(WDM),the generated 1070 nm laser is coupled into the cascaded Raman oscillator,which comprised PM980 gain fiber and two pairs of FBGs with wavelengths of 1120 nm and1178 nm,respectively.The 1120 nm FBG had a high reflection,which could improve the conversion effici

关 键 词：激光器 光纤激光器 拉曼振荡器 光纤布拉格光栅 非线性光学 二次谐波产生 

分 类 号：TN248[电子电信—物理电子学]