激光二极管泵浦的瓦级主动调Q翠绿宝石激光器  

LD Pumped Watt-Level Actively Q-switched Alexandrite Laser

作　　者：王景冲 关晨 刘兆军[1,2] 丛振华[1,2] 王世武 聂奕 刘杨[2,5] 赵智刚 Wang Jingchong;Guan Chen;Liu Zhaojun;Cong Zhenhua;Wang Shiwu;Nie Yi;Liu Yang;Zhao Zhigang(Key Laboratory of Laser and Infrared System of Ministry of Education,Shandong University,Qingdao 266237,Shandong,China;School of Information Science and Engineering,Shandong University,Qingdao 266237,Shandong,China;Qilu University of Technology(Shandong Academy of Sciences),Jinan 250104,Shandong,China;Crystech Co.,Ltd.,Qingdao 266000,Shandong,China;Jinan Institute of Quantum Technology,Jinan 250101,Shandong,China)

机构地区：[1]山东大学激光与红外系统教育部重点实验室,山东青岛266237 [2]山东大学信息科学与工程学院,山东青岛266237 [3]齐鲁工业大学(山东省科学院),山东济南250104 [4]青岛海泰光电技术有限公司,山东青岛266000 [5]济南量子技术研究院,山东济南250101

出　　处：《中国激光》2022年第13期1-7,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金(62075116,62075117);山东省重点研发计划(2019JMRH0111);山东省自然科学基金(ZR2019MF039)、山东省自然科学基金青年基金(ZR2020QF095)、山东省自然科学基金面上项目(ZR2020MF114);山东大学齐鲁青年学者启动基金;中国兵器工业集团有限公司激光器件技术重点实验室开放课题(KLLDT202114)。

摘　　要：报道了连续红光激光二极管(LD)泵浦的主动调Q翠绿宝石激光器。利用β相偏硼酸钡晶体(BBO)制成的普克尔盒作为主动调Q开关,在V型腔中实现了平均功率为1.16 W的755 nm激光输出,对应的重复频率为10 kHz,脉冲宽度为961 ns,单脉冲能量为116μJ;通过在腔内插入双折射滤光片(BRF),实现了728~793 nm的波长调谐,并进一步研究了不同重复频率下的脉冲特性。此外,采用腔倒空技术,成功将脉冲宽度压窄至10 ns,对应的中心波长为767 nm,峰值功率超过3 kW。Objective 700800 nm lasers at the border of visible light and near-infrared light have been used in many fields such as nonlinear optics,remote sensing detection,laser jamming,and laser medicine.They including many different types of lasers such as dye lasers,Ti:sapphire lasers,and Alexandrite lasers.Dye lasers are developed very early,but their gain media are toxic and the maintenance of laser systems is difficult.The development of Ti:sapphire lasers is relatively mature.Because of the broad gain bandwidth of Ti:sapphire,it is mostly used in the field of ultrafast lasers.The pump source of Ti:sapphire is mainly expensive green lasers,such as 532 nm frequency-doubled Nd∶YAG laser.In addition,the thermal effect of the gain medium is serious.In contrast,Alexandrite lasers can be pumped by more economical red laser diodes(LDs)because of its broad absorption spectrum.Wavelength tuning can be achieved at room temperature and the laser performance of Alexandrite increases at elevated temperatures due to its unique spectroscopic properties.Alexandrite has a long fluorescence lifetime of about 262μs at room temperature,almost 85 times longer than that of Ti:sapphire(about 3μs).This causes tremendous advantages of energy storage at the upper level to achieve Q-switched operation and obtain a high peak power output.Although the emission cross section is only 0.7×10^(-20)cm^(2),the high damage threshold(270 J/cm^(2))provides the possibility for an Alexandrite laser to work with a high pump power.An Alexandrite laser is an ideal choice to obtain a laser output at 700800 nm.In addition,a high power red LD is developing in recent years,and it is an excellent pump source to obtain an Alexandrite laser with high power and high pulse energy.Methods Electro-optical Q-switched operations are used in our experiments.First,a V-shaped cavity is obtained and the length of the cavity is about 33 cm.A fiber-coupled red diode laser emitting at 638 nm with a maximum pump power of 40 W is used as the pump source.The size of an Alexand

关 键 词：激光器 翠绿宝石激光器 红光激光二极管 主动调Q 腔倒空 波长可调谐 

分 类 号：TN248[电子电信—物理电子学]