长距离泵浦-探测系统的阿秒精度锁定  

Attosecond delay locking of large arm pump-probe system

作　　者：王柯俭 滕浩[2,4,5] 邢笑伟 董朔 曹凯强 江昱佼 赵昆 朱江峰 刘文军[2,3] 魏志义[2,4,5] Wang Ke-Jian;Teng Hao;Xing Xiao-Wei;Dong Shuo;Cao Kai-Qiang;Jiang Yu-Jiao;Zhao Kun;Zhu Jiang-Feng;‡Liu Wen-Jun;Wei Zhi-Yi(School of Physics and Optoelectronic Engineering,Xidian University,Xi’an 710071,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Science,Beijing University of Posts and Telecommunications,Beijing 100876,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]西安电子科技大学光电工程学院,西安710071 [2]中国科学院物理研究所,北京凝聚态物理国家实验室,北京100190 [3]北京邮电大学理学院,北京100876 [4]中国科学院大学物理科学学院,北京100049 [5]松山湖材料实验室,东莞523808

出　　处：《物理学报》2024年第19期25-30,共6页Acta Physica Sinica

基　　金：国家重点研发计划(批准号:2022YFA1604200);国家自然科学基金(批准号:12034020)资助的课题。

摘　　要：随着超快科学和阿秒脉冲技术的发展,基于孤立阿秒脉冲的泵浦-探测系统由于能实现对电子动力学的时间分辨测量,已成为人们开展阿秒超快过程研究不可或缺的关键技术.但要获得稳定可靠的泵浦-探测信号,需要保证泵浦与探测光之间阿秒级的高精度同步,较大的抖动将会导致信号产生弥散、甚至被淹埋在噪声中,从而无法获得真实的物理图像.由于阿秒脉冲从产生到应用终端之间的距离通常较长,要实现阿秒时间分辨,就必须对阿秒光脉冲与泵浦光进行阿秒量级的延时锁定.针对这一问题,本文发展了一种新型的双层光路系统,通过对获得的干涉条纹进行快速傅里叶变换,将获得的时间抖动量反馈给压电平移台实时补偿光程漂移,实现了泵浦光与探测光之间阿秒量级的同步锁定.应用该方案到光路长度从1—10 m的阿秒泵浦探测系统,得到了锁定精度分别从7.64—31.76 as的结果,分析表明系统延时误差与距离呈严格的线性关系,决定数R^(2)=0.96.本研究工作表明,使用小型干涉仪可实现对大科学装置中长距离阿秒泵浦探测系统的锁定精度进行快速检测,这对如非共线阿秒条纹相机、时间分辨光电子能谱仪、相干合成等应用具有一定的参考意义.With the development of ultrafast science and attosecond laser technology,the pump-probe system based on isolated attosecond laser pulses is a key to attosecond science,which will be used to study electronic dynamics on an attosecond time-scale.To obtain stable and reliable signals,it is necessary to ensure ultra-stable and ultra-accurate synchronization.Any timing jitter can cause signal to disperse or get buryied in noise,making it impossible to obtain the true physical mechanism.Based on the above,the delay between pump laser pulse and probe laser pulse must be controlled with an attosecond time resolution.In this work,a dual-layer system is developed to achieve high-precision synchronization locking.To ensure that both layers have the same time jitter,we design an adapter to secure the elements placed during installation.Timing jitter is obtained by shaking interference fringes through fast Fourier transformation,and can be calculated in several ms.Then error signals are fed back to the PZT stage in order to compensate for real-time optical path drift.Through such a design,a time-delay accuracy of 7.64 as to 15.53 as is realized,which is linearly related to the interferometer arm length ranging from 1 m to 5 m,with an R~2 of 0.96.Moreover,the error between the experimental result of arm length of 8 m and 10 m and the result fitted with the above data is less than 3 as.These results show that using a small interferometer can achieve the fast detection of the time-delay accuracy of long-arm attosecond pump-probe detection system in large scientific instrument,which is of great significance in guiding ther applications such as in non-collinear attosecond streaking spectroscopy,time-resolved photoelectron spectroscopy,and coherent synthesis.

关 键 词：超快科学 泵浦探测系统 延时锁定 

分 类 号：TN249[电子电信—物理电子学] TP391.41[自动化与计算机技术—计算机应用技术]