瓦级高效率中红外全固态3.8μm连续波Fe∶ZnSe激光器  

3.8 μm Continuous-Wave All Solid-State Fe∶ZnSe Laser

作　　者：沈炎龙[1] 万颖超 汪由胜 李高鹏[1] 马连英[1] 柴童星 陈正阁 朱峰[1] 黄珂[1] 冯国斌[1] Shen Yanlong;Wan Yingchao;Wang Yousheng;Li Gaopeng;Ma Lianying;Chai Tongxin;Chen Zhengge;Zhu Feng;Huang Ke;Feng Guobin(State Key Laboratory of Laser Interaction with Matter,Northwest Institute of Nuclear Technology,Xi'an 710024,Shaanxi,China)

机构地区：[1]西北核技术研究所激光与物质相互作用国家重点实验室,陕西西安710024

出　　处：《中国激光》2023年第7期190-195,共6页Chinese Journal of Lasers

基　　金：激光与物质相互作用国家重点实验室基金(SKLLIM1911)。

摘　　要：报道了瓦级高效率中红外3.8μm连续波全固态激光器。采用自行研制的波长为2.8μm的光纤激光器泵浦Fe∶ZnSe晶体,并通过液氮对晶体进行制冷,获得了中心波长为3.8μm的连续激光输出。激光器的最大输出功率为0.97 W,斜率效率达到38.6%,泵浦阈值约为0.4 W。Objective There are increasing demands for mid-infrared lasers at 3-5μm,which overlaps with the transparency window of atmosphere,for their potential applications in various fields,including laser surgery,spectroscopy,infrared countermeasures,environmental monitoring,and laser communication.There are lots of approaches to achieve lasers at 3-5μm band,which can be roughly divided into two major categories.The first category is based on population inversion,namely the linear method,which includes HF/DF gas lasers,semiconductor cascade lasers,fiber lasers,and solid-state lasers (typically Fe∶ZnSe or Fe∶ZnS lasers).The second category is based on the nonlinear effect,including optical parametric oscillators (OPO,typically using PPLN and ZGP crystals as nonlinear media),difference frequency generation (DFG),and frequency doubling.Compared to these lasers,the Fe∶ZnSe or Fe∶ZnS lasers,emitting at the mid-infrared range of 4-5μm,enjoy several advantages,including high efficiency,wide wavelength-tuning range,and compactness of optical cavity.As a consequence,lots of efforts have been made in the development of Fe∶ZnSe/Fe∶ZnS lasers in the past decade.For some practical applications,continuous-wave (CW) Fe∶ZnSe/Fe∶ZnS lasers are required.Several CW Fe∶ZnSe lasers,all of which operates at the wavelengths of over 4μm,have been demonstrated by using various CW pumping sources,including the Cr:ZnSe laser,Er:YAG laser,Er:ZBLAN fiber laser,and Er:Y_(2)O_(3) laser.Limited by matured pump sources at ~3μm,CW Fe∶ZnSe lasers were seldom domestically reported.In this paper,a CW Fe∶ZnSe laser at ~4μm is demonstrated by using a self-developed continuous-wave Er-doped fiber laser at 2.8μm.Methods The pump source used in our study is a continuous-wave Er-doped fiber laser at ~2.8μm developed in our lab.It has a maximum output power of about 4 W.The gain medium,i.e.,the Fe∶ZnSe crystal is 3.5 mm in length and has a cross section of 10 mm×10 mm,with the Fe^(2+) ion concentration of 1.0×10^(19) cm^(-3).For o

关 键 词：激光器 全固态激光器 中红外激光 Fe∶ZnSe晶体 高效率 

分 类 号：TN212[电子电信—物理电子学] TN248.1