Open AccessBayesian optimal control of the ultrashort circularly polarized attosecond pulse generation by two-color polarization gating
Author(s) -
Chon-Teng Belmiro Chu,
YaeLin Sheu,
ShihI Chu
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.438212
Subject(s) - attosecond , physics , optics , high harmonic generation , harmonics , polarization (electrochemistry) , circular polarization , frequency resolved optical gating , dipole , ultrashort pulse , laser , femtosecond pulse shaping , voltage , quantum mechanics , chemistry , microstrip
We present ab initio simulations of optimal control of high-order-harmonic generation spectra that enable the synthesis of a circularly polarized 53-attosecond pulse in a single Helium atom response. The Bayesian optimization is used to achieve control of a two-color polarization gating laser waveform such that a series of harmonics in the plateau region are phase-matched, which can be used for attosecond pulse synthesis. To find the underlying mechanisms for generating these harmonics, we perform a wavelet analysis for the induced dipole moment in acceleration form, and compare the time-energy representation with the quantum paths extracted from the semiclassical calculation. We found that these coherent harmonics are excited along the short trajectories. The proposed method has the potential to migrate to laboratories for generation of isolated circularly polarized ultrashort attosecond pulses.