310 nm紫外固体拉曼激光器  

310 nm Ultraviolet Solid⁃State Raman Laser

作　　者：陈忆兰 刘继桥 王明建[3] 朱小磊[1,2] Chen Yilan;Liu Jiqiao;Wang Mingjian;Zhu Xiaolei(Key laboratory of Space Laser Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Laboratory of Space Laser Engineering,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]中国科学院上海光学精密机械研究所空间激光传输与探测技术重点实验室,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049 [3]中国科学院上海光学精密机械研究所航天激光工程部,上海201800

出　　处：《中国激光》2023年第22期28-33,共6页Chinese Journal of Lasers

基　　金：民用航天预先研究项目(20Q61502F1)。

摘　　要：利用偏硼酸钡(BBO)倍频晶体,实现了1064 nm激光泵浦金刚石拉曼激光器的高重复频率紫外激光脉冲输出。搭建了腔内倍频金刚石拉曼激光器,实现了620 nm激光输出。当1064 nm泵浦光的功率为4.0 W时,620 nm输出激光的功率为550 mW,转换效率约为13.7%。通过BBO晶体腔外倍频,获得了平均功率约为48 mW的310 nm紫外激光脉冲输出,脉冲重复频率为2 kHz,脉冲宽度约为761.8 ps,倍频效率约为8.7%。Objective Ozone is one of the most important gaseous components in the Earth’s atmosphere.Atmospheric ozone includes stratospheric and tropospheric ozone.Stratospheric ozone absorbs most of the ultraviolet rays from the sun to prevent damage to life.Differential absorption Lidar(DIAL)has been widely used to measure ozone concentrations.As transmitters are key components of a DIAL system,several groups have demonstrated their work on transmitters.However,compared to transmitters with wavelengths below 300 nm,ultraviolet transmitters with wavelengths of 300-320 nm can transmit laser through a high ozone concentration in the atmosphere.Compared to optical parameter oscillators(OPO)and second harmonic generation(SHG)from 1.3μm laser,Raman lasers do not require phase matching management.Solid-state Raman lasers offer the advantages of compactness and high beam quality.In this study,we investigate a pulsed ultraviolet 310 nm laser with stimulated Raman scattering and frequency doubling,aiming at the demand for transmitters for ozone DIAL.Methods The 310 nm ultraviolet solid-state Raman laser includes three parts:a pump source for the diamond Raman laser,a 620 nm intracavity frequency-doubled diamond Raman laser,and a 310 nm ultraviolet laser based on extracavity doubling.The experimental setup of the 310 nm ultraviolet laser is shown in Fig.1.The pump source is a home-made 1064 nm Nd∶YAG amplifier.A half-wave plate is inserted behind the 1064 nm pump laser to align the pump beam laser polarization direction to match the<111>direction of the diamond crystal to maximize the Raman gain.A focus lens with a focal length f of 200 mm is used to focus the pump beam onto the diamond.The waist radius of the pump beam in the diamond is~200μm.Compared to other Raman laser materials,high-quality diamonds have high Raman gain,high thermal conductivity,high damage threshold,and wide spectral transmission.A low-nitrogen,low-birefringence diamond crystal with a size of 2 mm×2 mm×7 mm is used as the Raman gain medium.The propaga

关 键 词：激光器 紫外激光器 拉曼激光器 倍频 

分 类 号：TN243[电子电信—物理电子学]