Nd∶GSAG晶体生长、结构、光谱及激光性能  

Growth,Structure,Spectroscopy,and Laser Performance of Nd∶GSAG Crystals

作　　者：黄磊 张庆礼[2,3] 罗建乔 刘文鹏[2,3] 张俊蕊 窦仁勤[2,3] 孙贵花 权聪 陈迎迎[2,3,4] 丁守军 刘耀[1,2,3] 樊颖 Huang Lei;Zhang Qingli;Luo Jianqiao;Liu Wenpeng;Zhang Junrui;Dou Renqin;Sun Guihua;Quan Cong;Chen Yingying;Ding Shoujun;Liu Yao;Fan Ying(School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230026,Anhui,China;Anhui Provincial Key Laboratory of Photonic Devices and Materials,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Anhui,China;Advanced Laser Technology Laboratory of Anhui Province,Hefei 230037,Anhui,China;Science Island Branch,Graduate School,University of Science and Technology of China,Hefei 230026,Anhui,China;School of Microelectronics and Data Science,Anhui University of Technology,Maanshan 243002,Anhui,China;Institutes of Physical Science and Information Technology,Anhui University,Hefei 230061,Anhui,China)

机构地区：[1]中国科学技术大学环境科学与光电技术学院,安徽合肥230026 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所安徽省光子器件与材料重点实验室,安徽合肥230031 [3]先进激光技术安徽省实验室,安徽合肥230037 [4]中国科学技术大学研究生院科学岛分院,安徽合肥230026 [5]安徽工业大学微电子与数据科学学院,安徽马鞍山243002 [6]安徽大学物质科学与信息技术研究院,安徽合肥230061

出　　处：《中国激光》2023年第23期63-71,共9页Chinese Journal of Lasers

基　　金：国家自然科学基金(51172236,51802307,52272011);先进激光技术安徽省实验室开放研究基金(AHL20220-ZR04,AHL2021-KF07);安徽省重大科技专项(202203a05020002);中国科学院青年创新促进会(2023463)。

摘　　要：Nd∶GSAG是重要的942 nm固体激光工作物质,在机载和星载水汽检测中有重要的应用。生长了低浓度Nd∶GSAG晶体,通过与高掺杂浓度Nd∶GSAG、Nd∶YAG进行对比,研究了它的结构、光谱和激光性能。掺杂原子数分数为0.94%的Nd∶GSAG晶体在808.5 nm处的吸收系数为3.79 cm^(-1),吸收截面为3.41×10^(-20)cm^(2),4 F3/2上能级寿命为275μs,比掺杂原子数分数为1.20%的Nd∶GSAG晶体高出22μs。掺杂原子数分数为0.94%的Nd∶GSAG晶体在942 nm和1060 nm处的激光半峰全宽分别为0.53 nm和0.59 nm,比Nd∶YAG在946 nm和1064 nm处的激光半峰全宽0.66 nm和0.64 nm窄,表明其光波单色性更好。掺杂原子数分数为0.94%的Nd∶GSAG在942 nm处的斜效率和光光转换效率分别为5.5%和4.2%,优于Nd∶YAG在946 nm处的斜效率(5.0%)和光光转换效率(3.2%),但在1.06μm附近低于Nd∶YAG。942 nm处于水汽的吸收波段,上述结果表明Nd∶GSAG的942 nm波段激光有望成为水汽检测的优良光源。Objective Atmospheric water vapor has a significant impact on the greenhouse effect,water cycle,weather phenomena,atmospheric physical and chemical reactions,and air quality;therefore,the detection of atmospheric water vapor profiles is crucial.Differential absorption lidar(DIAL)is a highprecision,highspatiotemporalresolution atmospheric water vapor detection system with important application prospects for airborne and satellite platforms.The absorptivity values of light with wavelengths in the vicinity of 940 nm,935 nm/936 nm,942 nm/943 nm,and 944 nm are high in water vapor and are less affected by interference from other gases,making it suitable for lidar emission light sources.Nd∶GSAG crystals exhibit excellent radiation resistance and are therefore suitable for use in space environments.It can directly generate the laser with wavelength of 942 nm pumped by laser diode(LD)and has advantages such as high efficiency and stability,long lifespan,light weight,and small volume.It is suitable for use on airborne and satellite platforms.Differential absorption lidar for water vapor detection requires high wavelength stability,linewidth,and spectral purity of the emitted laser.Therefore,further research on the spectral and laser performances of Nd∶GSAG,as an excellent 942 nm laser working material,is warranted.In addition,reducing the doping concentration of Nd3+in garnet laser crystals is expected to increase the fluorescence lifetime,reduce the thermal lensing effect,and improve the laser beam quality.Therefore,optimizing the doping concentration of Nd∶GSAG is expected to improve its 942 nm laser efficiency and beam quality.Methods According to the stoichiometric ratio of Nd_(0.045)Gd_(2.955)Sc_(2)Al_(3)O_(12),the raw materials Gd_(2)O_(3),Sc_(2)O_(3),Al_(2)O_(3),and Nd_(2)O_(3) are weighed,evenly mixed,pressed into circular blocks,and calcined in a muffle furnace to obtain polycrystalline raw materials.Finally,a singlecrystal furnace is used to grow crystals with a size of 50 mm×70 mm,and the laser ablation(L

关 键 词：激光光学 固体激光 Nd∶GSAG 光谱 

分 类 号：TN244[电子电信—物理电子学]