单个阿秒脉冲表征技术研究进展  

Research Progress of Isolated Attosecond Pulse Characterization

作　　者：王家灿 肖凡 王小伟[1,2] 王力 陶文凯 赵零一 李悉奥 赵增秀 Wang Jiacan;Xiao Fan;Wang Xiaowei;Wang Li;Tao Wenkai;Zhao Lingyi;Li Xi ao;Zhao Zengxiu(College of Science,National University of Defense Technology,Changsha 410073,Hunan,China;Hunan Key Laboratory of Extreme Matter and Applications,National University of Defense Technology,Changsha 410073,Hunan,China)

机构地区：[1]国防科技大学理学院,湖南长沙410073 [2]极端条件物理及应用湖南省重点实验室,湖南长沙410073

出　　处：《中国激光》2024年第7期35-48,共14页Chinese Journal of Lasers

基　　金：国家重点研发计划(2019YFA0307703);国家自然科学基金(12234020,11974426);国家自然科学基金重大研究计划(91850201)。

摘　　要：自本世纪初超快科学进入阿秒领域以来,阿秒脉冲以其超宽频谱和超短时间分辨,为研究阿秒时间尺度的瞬态过程提供了有力工具,推动了人们对光与物质相互作用以及微观超快动力学机制的理解。基于高次谐波的单个阿秒脉冲产生技术已日臻成熟,通过发展多种时空选通门技术,阿秒脉冲脉宽不断缩短,已达到的最短纪录为43 as。相较于阿秒脉冲的产生,对其精确测量与表征是深入研究和应用的基础,目前主流表征方法是通过阿秒条纹相机技术测量获得条纹能谱,进而从中提取阿秒脉冲的时域信息。首先简要回顾了高次谐波产生、单个阿秒脉冲选通及测量的发展,然后介绍了阿秒条纹相机技术的原理,并重点阐述了基于阿秒条纹能谱的表征算法,对其主要优缺点进行分析,最后对阿秒脉冲表征的发展进行了总结和展望。Significance In 2023,Pierre Agostini,Ference Krausz and Anne L Huillier had been awarded the Nobel Prize in Physics for their contribution in experimental methods of generating attosecond pulses of light for the study of electron dynamics in matter.Based on their pioneering work of high harmonics generation(HHG),generation and characterization of attosecond pulse trains(APTs)and isolated attosecond pulses(IAPs),a whole new physics research field named attosecond science was opened up.With the rapid development of attosecond science in the past two decades,extremely short IAPs have been generated and applied in photon spectroscopy and attosecond transient absorption spectroscopy(ATAS),providing researchers more powerful tool to study the ultrafast electron dynamics in atoms,molecules and condensed matter than ever with attosecond temporal resolution.These ultrafast processes include the photoionization time delay in atoms,ionization difference of polar and non-polar molecules,electrons migration in multi-atomic molecules,measurement of Auger decay process,inner-shell transition and probing of multielectron dynamics.Progress Thanks to the progress of the ultrafast laser techniques as pumping lasers,multiple methods for gating,and fine spectral chirp for compensation in the past two decades,the spectrum of the IAP has expanded from tens of electron volts to hundreds of electron volts and its pulse duration record is getting compressed.Although many research groups have succeeded in achievement of broadband spectrum and appropriate dispersion compensation,generating sub-100 as(1 as=10^(-18) s)IAP with world record 43 as,precise characterization is the basis of further study and applications of IAP.Firstly in 2001,the reconstruction of attosecond beating by interference of two-photon transitions(RABBITT)and model analysis method were proposed independently for characterization of half-cycle separated 250 as duration APTs and IAP with 650 as pulse duration respectively.For the accurate measurement of such short attosec

关 键 词：非线性光学 单个阿秒脉冲 阿秒条纹相机 相位反演与表征 

分 类 号：O437[机械工程—光学工程]