超快强激光泵浦强太赫兹源及其驱动的材料非平衡态研究进展  

Research Progress on Ultrafast Intense Laser Based High⁃Field Terahertz Generation and Application on Non⁃Equilibrium State Materials

作　　者：王康 方依霏 程曦 张泽宇 宋立伟[1] 杜鹃 田野[1] 冷雨欣[1,2] Wang Kang;Fang Yifei;Cheng Xi;Zhang Zeyu;Song Liwei;Du Juan;Tian Ye;Leng Yuxin(State Key Laboratory of High Field Laser Physics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;School of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,Zhejiang,China;College of Optical Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]中国科学院上海光学精密机械研究所强场激光物理国家重点实验室,上海201800 [2]中国科学院大学杭州高等研究院物理与光电工程学院,浙江杭州310024 [3]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《中国激光》2023年第17期51-67,F0002,共18页Chinese Journal of Lasers

基　　金：国家重点研发计划(2022YFA1604400)。

摘　　要：太赫兹源是太赫兹科学技术发展和相关应用研究的基础。超快激光为太赫兹的产生和探测提供了稳定、可靠的激发光源。超快激光泵浦各种激发介质可以产生太赫兹波,激发介质主要有4类:1)固体介质,如光电导天线、晶体等;2)气体介质,如空气;3)液体介质,如液态水、液态镓、液氮等;4)等离子体介质,如钛薄膜、金属铜箔。太赫兹场强的进一步提高催生了人们对强场太赫兹与物质的相互作用以及太赫兹非线性光谱学的研究,太赫兹不仅能作为探测物性的手段,其发射光谱亦可以实现对材料中非平衡态载流子与晶格、自旋等有序度的强耦合。本文综述了超快激光激发数种不同类型介质产生太赫兹源的国内外研究发展历程,包括其工作原理以及目前存在的问题,总结了目前强场太赫兹波在物态调控方面的应用,以及太赫兹时间分辨光谱在新型物态探测方面的应用,最后展望了太赫兹源未来的发展趋势和应用前景。Significance Terahertz(THz)radiation located between the optical and microwave frequency region is known as the“THz gap”(0.1‒10 THz).THz radiation has many unique characteristics,such as low photon energy,transmission of organic materials,and high spectral resolution.These unique properties confirm that THz radiation has significant application value in multiple fields such as information communication,biomedicine nondestructive testing,and scientific research.Traditional THz application is primarily confined to the weak field passive detection linear region,while the transient strong field THz can be used to actively regulate the state of matter.The high-field THz radiation source has strong application demand in nonlinear optics,quantum and condensed matter physics,and many other fields.On one hand,as a unique means of manipulation,strong field THz waves can be used for the coherent regulation of materials,such as that of the electrical and phonon states and phase transition induction.Meanwhile,it can also be utilized as a special diagnostic means for transient spectroscopy diagnosis and single imaging.The pump-probe technique corresponding to the strong field THz wave can be used to characterize ultrafast dynamic processes of energetic materials or plasmas under extreme conditions.An ultrafast laser provides a stable reliable excitation source for THz generation and detection.THz waves can be generated using ultrafast laser pumping and various excitation media,such as photoconductive antennas,nonlinear crystals,metallic copper foil,air,and liquid water.With continuously increasing THz field strength,matter manipulation using high field THz and nonlinear spectroscopy in the THz region has been recently promoted.Furthermore,it has been demonstrated that THz absorption spectroscopy could assist in revealing excited state dynamics,and that THz emission spectroscopy could also be used to distinguish the strong coupling of carriers,excitons,phonons,and other elementary excitations.Progress In this study,THz so

关 键 词：激光技术 超快激光 强场太赫兹波 物态调控 

分 类 号：O441.4[理学—电磁学]