Phase-coherence dynamics of frequency-comb emission via high-order harmonic generation in few-cycle pulse trains  

作　　者：梁畅通 张晶晶 李鹏程 Chang-Tong Liang;Jing-Jing Zhang;Peng-Cheng Li(Research Center for Advanced Optics and Photoelectronics,Department of Physics,College of Science,Shantou University,Shantou 515063,China;Key Laboratory of Intelligent Manufacturing Technology of the Ministry of Education,Shantou University,Shantou 515063,China;Institute of Applied Physics and Computational Mathematics,Beijing 100088,China)

机构地区：[1]Research Center for Advanced Optics and Photoelectronics,Department of Physics,College of Science,Shantou University,Shantou 515063,China [2]Key Laboratory of Intelligent Manufacturing Technology of the Ministry of Education,Shantou University,Shantou 515063,China [3]Institute of Applied Physics and Computational Mathematics,Beijing 100088,China

出　　处：《Chinese Physics B》2023年第3期205-211,共7页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.12074239 and 91850209);the Natural Science Foundation of Guangdong Province,China(Grant Nos.2020A1515010927 and 2020ST084);the Fund from the Department of Education of Guangdong Province,China(Grant Nos.2019KTSCX038 and 2020KCXTD012);the Fund from Shantou University(Grant No.NTF18030).

摘　　要：Frequency-comb emission via high-order harmonic generation(HHG)provides an alternative method for the coherent vacuum ultraviolet(VUV)and extreme ultraviolet(XUV)radiation at ultrahigh repetition rates.In particular,the temporal and spectral features of the HHG were shown to carry profound insight into frequency-comb emission dynamics.Here we present an ab initio investigation of the temporal and spectral coherence of the frequency comb emitted in HHG of He atom driven by few-cycle pulse trains.We find that the emission of frequency combs features a destructive and constructive coherences caused by the phase interference of HHG,leading to suppression and enhancement of frequency-comb emission.The results reveal intriguing and substantially different nonlinear optical response behaviors for frequency-comb emission via HHG.The dynamical origin of frequency-comb emission is clarified by analyzing the phase coherence in HHG processes in detail.Our results provide fresh insight into the experimental realization of selective enhancement of frequency comb in the VUV–XUV regimes.

关 键 词：high-order harmonic generation frequency comb time-dependent Schro¨dinger equation intense laser field systems 

分 类 号：TN24[电子电信—物理电子学]