Exploration of spectral and temporal fine structures of high-order harmonic generation1

30th International Conference on Photonic, Electronic, and Atomic Collisions

Li, Peng-Cheng^1 ; Lei, Xiong-Yuan^1 ; Zhou, Xiao-Xin^1 ; Chu, Shih-I^2

College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou

730070, China^1

Department of Chemistry, University of Kansas, Lawrence

KS

66045, United States^2

关键词: Dinger equation;    Dipole emission;    Generalized pseudospectral method;    High order harmonic generation;    Synchrosqueezing;    Temporal fine structure;    Time frequency analysis;    Time frequency characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/875/3/022024/pdf
DOI  :  10.1088/1742-6596/875/3/022024

来源: IOP

【 摘 要 】

Synopsis We present an ab initio precision investigation of the time-frequency characteristics of high-order harmonic generation (HHG) calculated by solving accurately and efficiently the time-dependent Schrödinger equation by means of the time-dependent generalized pseudospectral method. We extend a new synchrosqueezing transform (SST) to obtain the timefrequency spectra of the HHG and the dynamical phase associated with the dipole-emission time profile. The SST timefrequency analysis allows us to explore the in depth dynamics and contributions of the multi-rescattering trajectories and resonant trajectories in HHG. It also exhibits the subtle details of the spectral and temporal fine structures of the HHG, providing novel insights regarding the dynamical origin of the HHG in below-and above-threshold regimes.