Symmetry in Nonlinear Interaction of Femtosecond Laser Radiation with Matter

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: 31 August 2024 | Viewed by 770

Special Issue Editors

Institute of Atomic and Molecular Physics, Jilin University, Changchun, China
Interests: quantum mechanics; attosecond physics; harmonics; nanostructures
Minhang Campus, East China Normal University, Shanghai, China
Interests: strong laser–matter interaction; squeezing of quantum light; multi-dimensional spectroscopy
Special Issues, Collections and Topics in MDPI journals
Dr. Lanhai He
E-Mail Website
Guest Editor
Institute of Atomic and Molecular Physics, Jilin University, Changchun, China
Interests: strong-field ionization; quantum state-selection; hydrated cluster; X-ray spectroscopy
Dr. Xi Zhao
E-Mail Website
Guest Editor
School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China
Interests: attosecond science; X-ray spectroscopy; large scale simulation in ultra-fast science; machine learning in atom/molecular physics

Special Issue Information

Dear Colleagues,

Many high-order nonlinear phenomena, including high harmonic generation, tunneling ionization, double ionization, laser-induced electron diffraction, and laser-induced ultrafast current, among others, can occur when a powerful femtosecond laser interacts with gaseous, aqueous, or solid objects. Novel experimental approaches have been developed to inspect the signals of ions, electrons, or photons within ultrashort timescales. The most reliable methodology for modeling the experimental observables is to solve a time-dependent Schrodinger equation (TDSE) or another enlarged dynamic equation. To make the physical process easier to grasp, several semi-analytic models have also been proposed.

The output signal is primarily influenced by the symmetry property of the target, making it natural to analyze experimental or numerical data from a symmetry perspective. As our understanding of the connection between the target's symmetry property and the characteristics of an ultrafast signal deepens, predicting the features of the output signal becomes more feasible. Furthermore, the ultrafast output signal can serve as an effective tool for detecting the symmetry property of an unknown target. In particular, achieving ultrafast time-resolution in monitoring phase transitions, while considering changes in the symmetry property, necessitates the study of the causal relationship between the sample's symmetry and the features observed in the output signal.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following: space-time symmetry, nonlinear interaction, strong-field ionization, high harmonic generation, time-resolved spectroscopy, and electron dynamics.

Dr. Jun Wang
Dr. Shicheng Jiang
Dr. Lanhai He
Dr. Xi Zhao
Guest Editors

Manuscript Submission Information

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Keywords

  • space-time symmetry
  • strong-field physics
  • ultrafast spectroscopy
  • high harmonic generation
  • nonlinear interaction
  • time-resolved detection

Published Papers (1 paper)

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Research

10 pages, 1482 KiB  
Article
Orientation Dependence of High-Order Harmonic Generation from HeH2+ in a Corotating Two-Color Circularly Polarized Laser Field
Symmetry 2024, 16(2), 185; https://doi.org/10.3390/sym16020185 - 04 Feb 2024
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Abstract
By numerically solving the time-dependent Schrödinger equation, we study high-order harmonic generation from the asymmetric diatomic molecule HeH2+ in a corotating two-color circularly polarized laser field. Our results reveal a strong correlation between the molecule orientation and the harmonic yield. The harmonics [...] Read more.
By numerically solving the time-dependent Schrödinger equation, we study high-order harmonic generation from the asymmetric diatomic molecule HeH2+ in a corotating two-color circularly polarized laser field. Our results reveal a strong correlation between the molecule orientation and the harmonic yield. The harmonics in the plateau region can achieve an intensity modulation of one to two orders of magnitude with the change in the orientation angle. Through the time-dependent evolution of ionized electron wave packets combined with the analysis of the transition dipole moment between the continuum and bound states, the modulation of the harmonic strength may be attributed to the difference in the recollision angle of ionized electron wave packets relative to the molecules. In addition, the harmonic ellipticity is also affected by the molecular orientation. Notably, we found that the harmonic with greater ellipticity and higher intensity can be obtained with an orientation angle of 147°. These findings open up new avenues for achieving enhanced efficiency, the near-circular polarization of harmonics, and precise control over harmonic polarization states. Full article
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