研究目的
Investigating the Coulomb effect on the dynamics of atoms in a strong elliptical laser field, focusing on the excitation and ionization processes, and the high-order harmonic generation.
研究成果
The study concludes that the Coulomb effect significantly influences the excitation and ionization processes in a strong elliptical laser field but has a negligible impact on high-order harmonic generation. It also demonstrates that excitation and ionization can be treated in a unified way, similar to weak-field photoabsorption, suggesting a connection between low-energy photoelectron distributions and populations of highly excited states.
研究不足
The study is limited to hydrogen atoms and does not explore more complex systems. The computational method, while accurate, requires significant resources for simulations, especially for higher laser intensities and more complex atomic systems.
1：Experimental Design and Method Selection:
The study involves solving the three-dimensional time-dependent Schr?dinger equation (TDSE3D) with and without the photoelectron core Coulomb interactions to investigate the dynamics of atoms in a strong elliptical laser field. The method combines the split-operator method and the generalized pseudospectral (GPS) method for accurate simulations.
2：Sample Selection and Data Sources:
The study focuses on hydrogen atoms interacting with an elliptical laser field. The laser parameters include a center wavelength of 800 nm and a full pulse duration of 20 fs.
3：List of Experimental Equipment and Materials:
The primary tool is a computational method for solving the TDSE3D, utilizing a three-dimensional time propagator developed by the authors.
4：Experimental Procedures and Operational Workflow:
The workflow involves setting up the TDSE3D solver with the specified laser parameters, running simulations with and without the Coulomb interaction, and analyzing the results for excitation, ionization, and high-order harmonic generation processes.
5：Data Analysis Methods:
The analysis includes calculating photoelectron momentum spectra, photoexcitation distribution, and HHG spectra from the time-dependent wave function obtained from the TDSE3D solver.
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