基于四波混频技术的台式飞秒真空紫外激光光源研究进展  

Development of Tabletop Femtosecond Vacuum Ultraviolet Laser Source Based on Four-Wave Mixing Techniques

作　　者：李紫荆 闫莉莉 左澎 谢良越 李志强 金兵 Li Zijing;Yan Lili;Zuo Peng;Xie Liangyue;Li Zhiqiang;Jin Bing(Institute of Molecular Sciences and Engineering,Institute of Frontier and Interdisciplinary Science,Shandong University,Qingdao,Shandong 266237,China;Key Laboratory of Laser&Infrared System(Shandong University),Ministry of Education,Center for Optics and Research Engineer(CORE),Shandong University,Qingdao,Shandong 266237,China;College of Environmental Sciences and Engineering,Peking University,Beijing 100080,China)

机构地区：[1]山东大学前沿交叉科学青岛研究院分子科学与工程研究院,山东青岛266237 [2]山东大学光学高等研究中心激光与红外系统集成技术教育部重点实验室,山东青岛266237 [3]北京大学环境科学与工程学院,北京100080

出　　处：《中国激光》2021年第12期105-119,共15页Chinese Journal of Lasers

基　　金：国家自然科学基金面上项目(21873114);分子反应动力学国家重点实验室开放课题。

摘　　要：在过去的二十多年里,台式飞秒真空紫外(VUV)激光光源技术经历了快速发展,与泵浦-探测技术相结合,在超快光化学领域的应用越来越得到重视。本文介绍了目前搭建台式飞秒VUV激光光源最常用的四波混频方法,并对空芯光纤中和光丝中的四波混频的发展做了较为详细的介绍和梳理。Significance Femtosecond laser technology plays an important role in the study of ultrafast dynamics of light-induced reactions.Many ultrafast spectroscopy techniques,such as transient absorption spectroscopy,ultrafast Raman spectroscopy,and ultrafast photoelectron spectroscopy/imaging,are widely used in scientific research in the fields of physics,chemistry,biology,and materials science.At present,the laser wavelength range produced by mature commercial femtosecond lasers is mainly limited to infrared,visible,and ultraviolet(UV)bands.When the absorption spectrum or ionization energy of a sample is in the vacuum ultraviolet(VUV)band below the wavelength of 200 nm(~6 eV),commercial femtosecond laser pulses are insufficient for achieving single-photon excitation/ionization of a sample.The two-photon or multiphoton absorption of long-wavelength lasers leads to low excitation/ionization efficiency compared with the single-photon process.In the past two decades,the technology for developing a miniaturized tabletop femtosecond VUV laser source using commercial femtosecond lasers(such as Ti:sapphire laser)in laboratories has advanced rapidly.This review briefly introduces four-wave mixing(FWM)techniques,which are widely used in a tabletop femtosecond VUV laser source.This work mainly focuses on the development of FWM in gas-filled hollow fibers and filaments.Progress An early femtosecond VUV laser system was capable of producing tunable femtosecond VUV pulses by two-photon near-resonant four-wave difference-frequency mixing in argon(Fig.3).To generate VUV pulses using the four-wave difference-frequency mixing scheme,high-intensity femtosecond laser pulses are required as a driving source.Moreover,only apart of the incident spectrum can contribute effectively to the frequency-mixing process,thereby leading to spectrally narrowed and temporally lengthened VUV pulses.Therefore,this near-resonant requirement limits the phase-matching bandwidth,tunability,pulse width,and conversion efficiency.FWM is achieved by converting th

关 键 词：激光光学 四波混频 台式飞秒真空紫外激光器 超快激发态动力学 

分 类 号：O436[机械工程—光学工程]