Probing spectral and temporal resolved dynamics in high-order harmonic generation of atom driven by multicycle near-infrared laser pulses
Journal
Laser Physics Letters
Journal Volume
17
Journal Issue
11
Pages
-
Date Issued
2020
Author(s)
Abstract
Abstract We present an ab initio 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 time-frequency spectra of the HHG and the dynamical phase associated with the dipole-emission time profile. The SST time-frequency analysis allows us to explore in depth the dynamics and contributions of the quantum trajectories in HHG. Particularly it uncovers the subtle details of the spectral and temporal fine structures of the HHG and provides novel insights regarding the dynamical origin of the HHG in below-threshold harmonic regimes.
SDGs
Type
journal article