温稠密物质交流电导率单发测量的时间精度提升与分析  

Improvement and analysis of time accuracy in single-shot measurement of ac conductivity of warm dense matter

作　　者：肖凡 王小伟[1,2] 王力[1,2] 王家灿 孙旭 郑志刚 范晓慧 张栋文 赵增秀[1,2] XIAO Fan;WANG Xiaowei;WANG Li;WANG Jiacan;SUN Xu;ZHENG Zhigang;FAN Xiaohui;ZHANG Dongwen;ZHAO Zengxiu(College of Science,National University of Defense Technology,Changsha 410073,China;Hunan Key Laboratory of Extreme Matter and Applications,National University of Defense Technology,Changsha 410073,China)

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

出　　处：《物理学报》2025年第9期27-34,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12234020,12450403,12374263)资助的课题.

摘　　要：基于空间啁啾的单发泵浦-探测技术是探究物质在强激光泵浦下达到温稠密态过程中电子非平衡动力学的重要手段,其时间分辨率已达到百飞秒量级.本文详细阐述了温稠密物质交流电导率的空间啁啾单发测量原理及高时间分辨实验装置,并对影响系统时间分辨率的关键因素进行深入剖析.分析表明,基于超短泵浦-探测脉冲,该系统可实现13.8 fs的时间分辨率.然而,在实际实验中,延时零点的精确标定、成像系统的景深限制以及低通滤波效应等因素,均会对系统的时间分辨能力产生显著影响.本研究不仅为提升温稠密物质交流电导率单发测量的时间精度提供了理论依据和实践指导,而且为探索强场条件下材料的超快动力学过程奠定了坚实的技术基础.The spatial chirp based single-shot pump-probe technique represents a pivotal technology for studying electron non-equilibrium dynamics in warm dense matter created with intense laser pulses.Notably,its time resolution can reach tens of femtoseconds.In this work,we introduce the single-shot measurement technique of ac conductivity of warm dense matter,as well as a detailed account of the experimental setup.In addition,the main factors limiting the time resolution of the system are discussed in depth.We show the system can achieve a resolution of 13.8 femtoseconds.Nevertheless,during practical application,several aspects,namely the calibration of the zero-delay,the depth of field of the imaging system,and the low-pass filtering effect inherent in the imaging system,will exert a substantial influence on the time-resolution.This research has important reference for enhancing the time accuracy of single-shot measurement of ac conductivity of warm dense matter.Moreover,it serves as a potent tool for the in-depth study of the ultrafast dynamic processes of materials under strong-field conditions.

关 键 词：温稠密物质 单发泵浦-探测 空间啁啾 交流电导率 

分 类 号：O562.5[理学—原子与分子物理]