LD双端泵浦高功率声光调Q Tm:YAP激光器  

A High-Power LD Double-End-Pumped Acousto-Optic Q-Switched Tm∶YAP Laser

作　　者：袁振 令维军[1] 陈晨 王翀 杜晓娟 王文婷 薛婧雯 董忠[1] Yuan Zhen;Ling Weijun;Chen Chen;Wang Chong;Du Xiaojuan;Wang Wenting;Xue Jingwen;Dong Zhong(Institute of Laser Technology,Tianshui Normal University,Tianshui,Gansu 741000,China)

机构地区：[1]天水师范学院激光技术研究所,甘肃天水741000

出　　处：《中国激光》2021年第5期226-233,共8页Chinese Journal of Lasers

基　　金：国家重点研发计划(2017YFB0405204);国家自然科学基金(11774257,61564008);甘肃省高等学校产业支撑计划项目(2020C-23);天水师范学院研究生创新引导项目(TYCX2035)。

摘　　要：以两个65 W的793 nm激光二极管(LD)作为泵浦源,采用U型谐振腔结构进行高功率声光调Q运转实验研究。采用三种b轴切割的板条状镀金Tm∶YAP晶体作为增益介质,分析比较三种增益介质和不同腔参数组合对激光输出性能的影响。当最大泵浦功率为130 W时,连续激光输出的最大功率为42.5 W,斜率效率为42.5%。经过声光(AO)调制后,当重复频率为10 kHz时,调Q激光的最大平均输出功率为33.2 W,脉冲宽度为200 ns。将重复频率提高至40 kHz时,获得最短脉冲宽度为64 ns,相应平均功率为30 W,中心波长为1944 nm的激光输出。采用MATLAB软件仿真输出脉冲激光光斑的三维能量分布,光斑能量呈典型的高斯分布,可见光束质量较好。高功率Tm∶YAP激光器可作为3~5μm中红外光学参量振荡器的泵浦源,在众多领域具有良好的应用前景和巨大的发展潜力。Objective The 2-μm mid-infrared laser is located in the weak absorption band of the atmosphere and the safe region of the human eye;thus,it is widely used in atmospheric environmental gas detection,clinical medical diagnosis,laser surgery,optical communication,and other fields.Recently,the 2-μm laser is a research hotspot in mid-infrared lasers.High-peak-power 2-μm pulse lasers are efficient pump sources for mid-infrared lasers using nonlinear frequency down-conversion.Importantly,it can be used as an ideal pump source for the 2.5-μm mid-infrared solid-state lasers such as Cr∶ZnSe and Cr∶ZnS and the 3-5-,8-12-μm mid-to far-infrared optical parametric oscillators(OPOs)such as ZnGeP,GaSe,and CdSe.The 3-5-μm band laser can monitor the industrial waste gas and polluted gases and the main light source for optoelectronic countermeasures,which is very important in national military security.The 3-5-,8-12-μm tunable OPO pump sources produce high-quality tunable mid-infrared band laser,which can be used in petroleum exploitation,atmospheric greenhouse-gas detection,data communication,and laser spectroscopy research.The 3-5-μm band laser mainly uses the acousto-optic Q-switched 2-μm laser as the pump source realized by nonlinear frequency conversion.In this study,we reported a pulsed laser with an output power of 33.2 W,a pulse width of 64 ns,and an adjustable repetition rate,which can help design 3-8-μm OPO pump sources and understand the performance parameters selection for Tm∶YAP crystals application.Methods We used Tm∶YAP crystal,acousto-optic Q-switch,and U-shaped resonant cavity as the research objects.Using the cavity design software,we designed the U-shaped resonant cavity and the experimental device,as shown in Figure 1.We used three different specifications of slab-shaped Tm∶YAP crystals.We selected and performed a continuous-wave experiment.We obtained the crystal with the highest average output power and the highest slope efficiency and selected the best cavity length.Using the best paramete

关 键 词：激光器 激光二极管(LD) Tm∶YAP晶体 声光Q开关 

分 类 号：TN248.1[电子电信—物理电子学]