阿秒脉冲串产生和相位信息重构的对比研究  

Comparative study on generation of attosecond pulse train and phase information reconstruction

作　　者：朱孝先 高亦谈 王羡之 王一鸣 王佶 王兆华[1,2,3] 赵昆 魏志义 Zhu Xiao-Xian;Gao Yi-Tan;Wang Xian-Zhi;Wang Yi-Ming;Wang Ji;Wang Zhao-Hua;Zhao Kun;Wei Zhi-Yi(National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,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]中国科学院大学,北京100049 [3]松山湖材料实验室,东莞523808

出　　处：《物理学报》2024年第12期126-135,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:92150103,61690221);中国科学院稳定支持基础研究领域青年团队计划(批准号:YSBR-059);国家重点研发计划(批准号:2017YFB0405202)资助的课题。

摘　　要：阿秒脉冲为研究原子、分子和电子的超快动力学提供了前所未有的测量精度.目前最成熟的方法是使用飞秒激光与气体相互作用产生阿秒脉冲串和孤立阿秒脉冲.阿秒脉冲的时域信息以及电子的动力学信息可以通过阿秒条纹相机或基于双光子跃迁干涉的重构阿秒拍频(RABBITT)方法从能谱图中提取.本文研究了阿秒脉冲串的产生、测量和表征,通过自主设计建造的钛宝石放大器和阿秒束线进行实验获得光电子能谱图,并采用不同方法重构阿秒脉冲串的相位信息.这对于深入理解电子动力学并进行相关测量具有重要意义.Attosecond pulses provide higher measurement precision for analyzing ultrafast dynamics in atoms,molecules,and electrons,laying the foundation for studying electronic motion in atomic and molecular systems.The most important method currently is to generate attosecond pulse trains and isolated attosecond pulses through the interaction of femtosecond lasers with gases.The temporal information of attosecond pulses and the dynamic information of electrons can be extracted from spectrograms by using attosecond streak camera or the reconstruction of attosecond beating by interference of two-photon transitions(RABBITT)method based on two-photon transition interference.Although the differences in phase among different high-order harmonics can be directly extracted from the oscillation frequencies of sidebands,the iterative algorithm of attosecond streak camera can provide complete phase information of attosecond pulse trains to better support the study of electron dynamics in atoms.Research purpose This work is dedicated to the investigation of the generation,measurement,and characterization of attosecond pulse train(APT),which are essential for probing ultrafast dynamics in atomic,molecular,and electronic systems.The focus is on the generation of APTs through interactions between femtosecond lasers and gases,as well as the extraction of temporal and dynamic information from these pulses by using advanced spectroscopic techniques such as the RABITT method.Methods The experimental approach involves the use of a homebuilt femtosecond titanium sapphire regenerative amplifier to produce high-order harmonics,leading to the generation of APTs.The setup includes the homebuilt titanium sapphire chirped pulse amplifier and a collinear attosecond pulse generation and measurement beamline,which are used to conduct RABITT experiments.The process requires the interaction of femtosecond lasers with gas targets to generate high-energy photons in the extreme ultraviolet and soft X-ray spectral ranges.By optimizing the phase-matching con

关 键 词：阿秒脉冲串 相位重构 RABBITT方法 阿秒条纹相机 

分 类 号：O56[理学—原子与分子物理] TN24[理学—物理]