吸收光谱法对Kr亚稳态浓度测量  

Concentration Measuring of Metastable Kr via Absorption Spectroscopy

作　　者：褚俊植 黄珂[2] 栾昆鹏 胡墅[1] 朱峰[2] 黄超[2] 李高鹏[2] 刘金波[1] 郭敬为[1] 刘栋[1] Chu Junzhi;Huang Ke;Luan Kunpeng;Hu Shu;Zhu Feng;Huang Chao;Li Gaopeng;Liu Jinbo;Guo Jingwei;Liu Dong(Key Laboratory of Chemical Lasers,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian,Liaoning 116023,China;State Key Laboratory of Laser Interaction with Matter,Northwest Institute of Nuclear Technology,Xi'an,Shaanxi 710024,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院大连化学物理研究所化学激光重点实验室,辽宁大连116023 [2]西北核技术研究所激光与物质相互作用国家重点实验室,陕西西安710024 [3]中国科学院大学,北京100049

出　　处：《中国激光》2021年第7期34-40,共7页Chinese Journal of Lasers

基　　金：激光与物质相互作用国家重点实验室基金(SKLLIM1913);国家自然科学基金(21973093);中科院化学激光重点实验室创新基金(KLCL-2019-10);大连化物所创新研究基金(DICPI201931)。

摘　　要：近年来光泵浦惰性气体亚稳态激光在高能激光领域逐渐得到人们的关注。搭建了一台高压纳秒脉冲放电产生惰性气体亚稳态粒子的装置,该装置增益尺寸较长,便于后续开展激光增益和放大实验。利用窄线宽可调谐连续光源探测了该装置放电生成的Kr亚稳态(5s[3/2]_(2))粒子数浓度,达1.3×10^(12) cm^(-3),该状态持续时间约为3μs,满足后续激光体系运行条件。测量过程中出现了吸收饱和现象,给粒子数浓度拟合带来了不确定性,设计的复合拟合方法解决了这一问题。Objective Diode-pumped alkali-vapor lasers(DPALs)represent a research hotspot in the field of high-power lasers owing to their advantageous properties,such as high efficiency,excellent beam quality,and scalability.However,DPALs are also affected by several issues:(1)alkali-metals are very active and react easily with coating materials of windows,sealant materials,etc.,especially at high temperature;therefore,it is very challenging to prepare the sample cell;(2)alkali-metals also react with relaxing gas(methane or ethane)and produce carbon that contaminates windows,thus seriously reducing the windows lifetime of the sample cell.As a consequence,researchers are putting enormous efforts into the exploration of substitutes for alkali-metals.Among these,metastable rare gases are considered to be the most promising candidates.Metastable rare gases have an electronic structure similar to that of alkali-metals.Therefore,optically-pumped metastable rare-gas lasers(OPRGLs)are expected to have similar properties to DPALs,without any of the disadvantages mentioned above.However,metastable rare gases do not readily exist;they are normally prepared trough high-voltage discharge.The density,homogeneity,and stability of metastable rare gases are key factors for OPRGLs.Methods The discharge system was composed of a simple circuit with a~100 ns pulsed high-voltage power supply and a pair of parallel plate Cu electrodes(Fig.2).The flat electrode discharge technique was used to produce a metastable state(5s[3/2]_(2))for Kr(here denoted as Kr^(*)).The discharge voltage is 15 kV,the distance between electrodes is 1.5 cm,and the electrodes dimensions are 120 mm×10 mm.In order to improve the homogeneity and stability of the discharge,a UV light pre-ionization technique was applied.A stainless-steel structure with three windows was used to contain the ultrahigh purity Kr(99.999%).The front and back windows were made of CaF_(2) to ensure that the infrared laser could pass through the cell,whereas the side window was made of polymethyl me

关 键 词：光谱学 激光吸收光谱 氪亚稳态 脉冲辉光放电 稀有气体激光 Voigt线型 

分 类 号：TN248.2[电子电信—物理电子学]