高效率高稳定性1018 nm单纤振荡器  

High Efficiency and Stability 1018 nm Single Fiber Oscillator

作　　者：陈楠谕 陈晓龙[1] 刘万生 刘一博 汪贺 何兵[1,2] 周军 Chen Nanyu;Chen Xiaolong;Liu Wansheng;Liu Yibo;Wang He;He Bing;Zhou Jun(Shanghai Keg Laboratory of All Solid-State Laser and Applied Techniques,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Science,Shanghai 201800,China;College of Materials Science and Opto-Electronic Technology.University of Chinese Academy of Sciences,Beijing 100049,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及应用技术重点实验室,上海201800 [2]中国科学院大学材料科学与光电技术学院,北京100049

出　　处：《中国激光》2022年第17期9-15,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(61735007,61805261,61705243);科技部重点研发计划(2018YFB0504500);中科院青促会项目(2020252)。

摘　　要：基于连续波速率方程,建立了1018nm单纤振荡器理论模型,优化了激光器增益光纤长度、输出腔镜低反光栅反射率和带宽以及激光器的结构。采用正向泵浦结构,使用波长锁定的半导体泵浦源和2.7m长的30μm/250μm掺Yb^(3+)双包层光纤,实现了520 W的最高功率输出,光光效率为80.2%,光束质量因子(M^(2))为1.85。此外,在447W处具有最高光光效率84.2%。同时,利用激光器主结构温度控制技术,使激光器稳定工作在21℃。最终实现了激光器连续工作1h功率不稳定度为0.7%的目标,实现了高效率、高稳定性1018nm激光的单纤振荡输出。Objective The laser power requirement is becoming higher and higher in the industrial and medical fields.It is an effective way to improve the output power of the 1018 nm fiber laser using the tandem-pumped technology.Compared with the conventional direct pumping technology for the 976 nm semiconductor laser,this technology has the advantages of high brightness and low quantum loss,resulting in the high output of pump power and the low influence of thermal effect from fiber and device.However,the main difficulty in the 1018 nm fiber laser is that the absorption cross-section of Yb3+at 1018 nm is larger than that at a longer wavelength.This leads to fierce competition between lasing at 1018 nm and amplified spontaneous emission(ASE)at 1030 nm.Based on the continuous wave rate equation model,the effects of gain fiber length,output grating reflectivity,and bandwidth on the output characteristics of a 1018 nm laser are analyzed.We hope that the methods and results of our research can be helpful to the design of stable and efficient tandem-pumped sources.Methods In this paper,first,we divide the ASE spectrum into the K equally spaced regions based on the rate equation model of a laser.The central wavelength of each region isλi,and the bandwidth isΔλi,where i=1,2,3,…,K.A rate equation model with an ASE term is established for a continuous wave.Second,the above model is used to simulate the output powers and output spectra of the laser under different pumping modes,and the appropriate pumping mode is selected.Third,the output characteristics of the output couplers with different reflectivity and bandwidths are simulated to screen out the appropriate range of reflectivity and bandwidth for the output coupler.Fourth,the effect of gain fiber length on the output characteristics of the laser is quantitatively described.According to the results of numerical simulation,we optimize the parameters of the laser system and conduct the experiments.Finally,the experimental results are compared with the simulated results,and an

关 键 词：激光器 光纤激光器 高效率 功率稳定性 

分 类 号：TN248.1[电子电信—物理电子学]