基于太赫兹脉冲加速及扫描电子束的高时间分辨探测器  

High time-resolution detector based on THz pulse accelerating and scanning electron beam

作　　者：李杭 陈萍[1] 田进寿[1] 薛彦华 王俊锋[1] 缑永胜[1] 张敏睿[1] 何凯 徐向晏[1] 赛小锋[1] 李亚晖 刘百玉[1] 王向林[1] 辛丽伟 高贵龙[1] 汪韬[1] 王兴[1] 赵卫[1] Li Hang;Chen Ping;†Tian Jin-Shou;Xue Yan-Hua;Wang Jun-Feng;Gou Yong-Sheng;Zhang Min-Rui;He Kai;Xu Xiang-Yan;Sai Xiao-Feng;Li Ya-Hui;Liu Bai-Yu;Wang Xiang-Lin;Xin Li-Wei;Gao Gui-Long;Wang Tao;Wang Xing;Zhao Wei(Key Laboratory of Ultrafast Photoelectric Diagnostics Technology,Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi’an 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]中国科学院西安光学精密机械研究所超快诊断技术重点实验室,西安710119 [2]中国科学院大学,北京100049 [3]山西大学极端光学协同创新中心,太原030006

出　　处：《物理学报》2022年第2期342-349,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11805267,12075311);中国科学院青年创新促进会(批准号:2021402);中国科学院科研仪器设备研制项目(批准号:GJJSTD20190004);中国科学院战略性先导科技专项A类(批准号:XDA25030900);企业创新争先青年人才托举计划项目;激光等离子体教育部重点实验室资助的课题。

摘　　要：与传统条纹相机加速和偏转电子束的方法相比,太赫兹强场的加速梯度和扫描偏转梯度有明显优势,具备实现飞秒级超高时间分辨的能力.本文基于这一新技术设计了一款基于太赫兹场操控电子束的超小型高时间分辨探测器.从理论上分析了加速区的时间弥散与电子脉冲发射时刻以及初始时间弥散的关系,并讨论了空间电荷效应对时间弥散的影响;设计并优化了加速区和偏转区的太赫兹脉冲耦合增强装置,太赫兹脉冲电场在该装置中的增强系数最高可达9.39.最终通过计算和分析本探测器的时间弥散,得到了时间分辨率优于50 fs的结果.Terahertz pulses accelerating and scanning electron beam can break through the limitation of accelerating electric field between cathodes and grids in traditional streak tubes,thus reducing the time dispersion and enhancing the temporal resolution of time-scanning detectors.Based on this new technology,in this paper an ultra-small structured time-resolved detector with no focusing pole is designed.The terahertz pulse coupling/enhancing device suitable for acceleration zone and scanning zone is designed and optimized.The enhanced coefficient of the terahertz pulse electric field in the device reaches 9.39.In the paper,the relationship between time dispersion in acceleration zone and the moment of electrons emission is analyzed theoretically.We also analyze the influence of space charge effect on time dispersion.The electronic trajectory tracking is used to calculate and analyze the time dispersion of this detector,and finally the time resolution is better than 50 fs.

关 键 词：条纹相机 太赫兹 时间分辨 

分 类 号：O441.4[理学—电磁学] TL55[理学—物理]