Bayesian optimal control of the ultrashort circularly polarized attosecond pulse generation by two-color polarization gating
Journal
Optics Express
Journal Volume
29
Journal Issue
21
Start Page
32900
ISSN
1094-4087
Date Issued
2021-09-27
Author(s)
Abstract
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.
SDGs
Publisher
Optica Publishing Group
Type
journal article