Symmetry in Nonlinear Interaction of Femtosecond Laser Radiation with Matter

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

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