半导体激光泵浦的3μm掺铒固体激光研究进展  

Research Progress of LD-Pumped 3 μm Er-Doped Solid-State Lasers

作　　者：王飞[1,3] 丁曼曼 沈德元 王俊[1,2] 唐定远 Wang Fei;Ding Manman;Shen Deyuan;Wang Jun;Tang Dingyuan(Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry,Jiangsu Normal University,Xuzhou,Jiangsu 221116,China;Jiangsu Key Laboratory of Advanced Laser Materials and Devices,Jiangsu Normal University,Xuzhou,Jiangsu 221116,China;Jiangsu Institute of Mid Infrared Laser Applied Technology,Xuzhou,Jiangsu 221000,China)

机构地区：[1]江苏师范大学江苏省先进激光技术与新兴产业协同创新中心,江苏徐州221116 [2]江苏师范大学江苏省先进激光材料与器件重点实验室,江苏徐州221116 [3]江苏中红外激光应用技术产业研究院,江苏徐州221000

出　　处：《中国激光》2022年第1期113-121,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(62035007,61875078)。

摘　　要：3μm激光在国防安全、生物医疗、光谱分析等领域具有广阔的应用前景。与非线性频率变换、半导体激光技术相比,利用掺Er的激光增益介质产生3μm激光是一种比较直接、高效的方法。随着3μm掺Er激光器在输出功率和效率方面的突破,半导体激光泵浦的3μm掺铒固体激光已成为热点研究方向。回顾了不同基质材料掺杂Er离子产生3μm激光的输出特性和研究进展;从铒离子能级结构出发,分析了铒离子间的能量传递上转换、激发态吸收等跃迁过程对3μm激光输出性能的影响,并对3μm稀土离子掺杂固体激光器的功率提升潜力和发展前景进行了展望。Significance 3μm laser sources have a broad application prospect in the fields of national defense and security,biomedicine,spectral analysis,and so on.Compared with the nonlinear frequency conversion and semiconductor laser technologies,laser-diode pumping for Er-doped lasers to emit 3μm wavelength is a more direct and efficient method.The radiation from energy level^(4)I_(11/2)to^(4)I_(13/2)of Er^(3+) ions produces 3μm lasing.Since the lifetime of the upper level is shorter than that of the lower level,it is difficult to realize a continuous laser operation due to the“self-termination effect”from the classic laser theory.However,due to the inherent complex energy transfer process and Stark sub-level splitting of the Er^(3+)doped system,an efficient 3μm laser continuous wave operation has been realized in many Er-doped matrices such as Er:YAG,Er:YLF,and Er:Y_(2)O_(3).The main known problems linked with Er-doped 3μm lasers are self-termination and large quantum losses.If the Er^(3+) ions are doped into low phonon matrix,the probability of non-radiative transition is reduced and the fluorescence decay time at the upper laser level^(4)I_(11/2) is prolonged.This fact results in a low probability of selftermination.To reduce the self-termination effect in high phonon matrix,a high Er-doping level is required.With the increase of doping level,the spacing between Er^(3+) ions is shortened,which is beneficial to ion-ion energy transfer.However,using the high doped active medium affects thermal conductivity,which makes the thermal management of the laser system more difficult.The Er-doped laser gain medium is pumped by a semiconductor laser of 0.97μm to produce a 3μm laser with a large quantum loss.Theoretically,the laser efficiency is limited to~33%,which means that two-thirds of the pump power is wasted and deposited into the gain medium as parasitic heat,resulting in degradation of laser performance.Researchers have established a mathematical model to estimate the theoretical limit of the emission efficienc

关 键 词：激光器 掺铒固体激光 3μm激光 高功率 自终止 

分 类 号：O43[机械工程—光学工程]