基于氘气受激拉曼散射的1.6μm波段大能量脉冲激光研究  

High Energy Pulsed Laser in 1.6μm Waveband Based on Deuterium Gas Stimulated Raman Scattering

作　　者：蔡向龙 李仲慧 刘栋[2] 王鹏远[2] 陈莹 刘金波[2] 石晶[1] 王婷婷 蔡红星[1] 郭敬为[2] Cai Xianglong;Li Zhonghui;Liu Dong;Wang Pengyuan;Chen Ying;Liu Jinbo;Shi Jing;Wang Tingting;Cai Hongxing;Guo Jingwei(School of Science,Changehuon Unicersity of Science and Technology,Changchun 130022,Jilin,China;Key Labortory of Chemical Laers,Dulian Inatitute of Chemical Phyices,Chinese Academy of Sciences,Dalian 116023,Liaoning,China;Wuxi Zhongke Optelectromics Technology Co.,Ltd.,Wuxi 214115,Jiangsu,China)

机构地区：[1]长春理工大学理学院,吉林长春130022 [2]中国科学院大连化学物理研究所中国科学院化学激光重点实验室,辽宁大连116023 [3]无锡中科光电技术有限公司,江苏无锡214115

出　　处：《中国激光》2022年第11期1-10,共10页Chinese Journal of Lasers

基　　金：国家自然科学基金(22073101,62005282)。

摘　　要：采用1064 nm脉冲激光作为泵浦光,通过高压氘气的受激拉曼散射变频实现1.56μm拉曼激光输出,并建立了计算受激拉曼散射与聚焦特征之间关系的模型,实现了对实验工作的指导。采用两次聚焦的设计,通过氘气气压以及聚焦参数等变量的优化,实现最高82.4%的光子转换率。为了提高1.56μm拉曼激光的单脉冲能量,采用降低气压、提高泵浦光脉冲能量等方式,实现了最高245 mJ的脉冲能量,并通过倍频实现了780 nm激光输出,从而获得一种产生780 nm波长高峰值功率脉冲激光的方法。Objective In atmospheric transmission windows,~1.6μm is a significant waveband,and lasers with emission wavelengths longer than 1.4μm are called eye-safe wavebands.Based on the above advantages,lasers of 1.6μm waveband are used as laser sources for aerosol lidar,laser range finder system,and other applications.The pulse energy(or average power)of the laser is a key parameter in determining the measurement distance of this type of instrument,and the large pulse energy of a 1.6μm waveband laser is imminently required.Several methods for generating lasers with a 1.6μm waveband,such as Er∶YAG and 1064nm pumped OPO lasers,are available;each has its advantages and applications.Stimulated Raman scattering(SRS)is a convenient method for generating lasers with new wavelengths.Gaseous Raman lasers have high conversion efficiency,high damage threshold,and high peak power(large pulse energy),among others.In this study,we present a 1.56μm Raman laser generated by 1064nm laser-pumped highpressure deuterium.Methods A Q-swithed Nd∶YAG laser of 1064nm is used as the pump source.The laser beam diameter is 8mm,the maximum output energy is 900 mJ,the full width at half maximum(FWHM)is approximately 10ns,and the repetition frequency is 10 Hz.Pressurized deuterium gas is used as a laser Raman active medium.The gas pressure varies 0.5--3.5 MPa.A double focus configuration is used for the SRS experiment.Further,the relationships between the conversion efficiency under different gas pressures,focus numbers,and focus positions are investigated.To study the beam quality of Raman laser,the frequency is doubled to 780nm.Results and Discussions A double focus configuration is used for the SRS experiment.Experimental parameters,such as the pressure of deuterium and focus condition are optimized under the assistance of theoretical simulation,and the maximum photon conversion efficiency of the Raman laser is 82.4%(Fig.6).In this study,the hole-burning effect of the Raman gain coefficient is identified and explained.This indicates that

关 键 词：激光物理 脉冲激光 受激拉曼散射 氘气 转换率 

分 类 号：TN248[电子电信—物理电子学]