高重复频率极紫外光源的产生和光谱技术研究进展  

Research Progress in Generation and Spectral Technology of High⁃Repetition⁃Rate Extreme⁃Ultraviolet⁃Light Sources

作　　者：王佶 赵昆 Wang Ji;Zhao Kun(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,Guangdong,China)

机构地区：[1]中国科学院物理研究所,北京凝聚态物理国家研究中心,北京100190 [2]松山湖材料实验室,广东东莞523808

出　　处：《中国激光》2024年第7期22-34,共13页Chinese Journal of Lasers

基　　金：国家自然科学基金(92150103,61690221);中国科学院稳定支持基础研究领域青年团队计划(YSBR-059)。

摘　　要：高重复频率极紫外光源已被广泛应用于电子动力学研究,并且在阿秒谱学研究和显微成像中有广阔的应用前景。高重复频率极紫外光源正在朝更高重复频率、更高光子通量、更高光子能量和更短脉宽的方向发展。介绍了高重复频率极紫外光源的产生和调控,以及极紫外光源应用的分辨能力优化,并展望了高重复频率极紫外光源的未来发展趋势。Significance The extreme-ultraviolet high-harmonic light source has attracted significant attention in electron dynamics because of its strong coherence,short pulse duration,and high photon energy.It has been applied in various spectroscopy and imaging studies.Using a high repetition rate,high photon flux,narrow linewidth,femtosecond extreme-ultraviolet-light source(1 fs=10-15 s)enables direct observation of conduction band structures and femtosecond-scale electron dynamics in materials.Furthermore,processes such as electron tunneling and molecular dissociation can be investigated extensively using a broadband attosecond light source.In recent years,the development of water window spectral-range wide-spectrum attosecond light sources has facilitated the detection of reaction pathways between molecules and the motion of charge carriers on material surfaces.By applying electron and ion detection techniques,time-resolved coherent measurements and other attosecond transient spectroscopy studies have been conducted.For attosecond-scale electron spectroscopy measurements,the number of events in a single-shot measurement is often insufficient,making low-repetition-rate light sources inadequate for obtaining reliable statistical data.Therefore,it is necessary to use highrepetition-rate extreme-ultraviolet-light sources.The efficiency and photon number per pulse of high-repetition-rate high-harmonic generation are significantly lower than those of low-repetition-rate high-harmonic generation.The single-pulse energy of high-repetition-rate driving lasers is lower than that of lowrepetition-rate driving lasers;therefore,tight focusing is required to achieve the high-intensity field necessary for high harmonic generation.However,the interaction region of the laser and gas is small during tight focusing,making it relatively difficult to achieve the required phase-matching conditions.Consequently,the conversion efficiency of high-repetition-rate high-harmonic generation is low.Various methods have been developed in terms of dr

关 键 词：非线性光学 超快光学 高次谐波 极紫外光源 

分 类 号：O437[机械工程—光学工程]