研究目的
Investigating high-order harmonic generation (HHG) for the H+2 molecular ion in a circularly polarized laser pulse (CPLP) and comparing HHG in a CPLP combined with a terahertz (THz) field and with a static electric field.
研究成果
The study demonstrates that adding a THz field to a CPLP can lead to a continuum spectrum with a spectral width of about 137 eV from 102 eV to 239 eV, with only one trajectory contributing to HHG. In contrast, adding a static electric field results in a double-plateau structure with large modulation in the harmonic spectrum. The findings provide insights into controlling quantum paths in harmonic emission processes.
研究不足
The study is limited to numerical simulations and does not include experimental validation. The focus is on the H+2 molecular ion, and the results may not be directly applicable to other molecular systems.
1：Experimental Design and Method Selection:
The study involves solving a two-dimensional time-dependent Schr?dinger equation (TDSE) using the second-order splitting-operator fast-Fourier transform technique. The initial wave function is constructed by the imaginary time-propagation method.
2：Sample Selection and Data Sources:
The study focuses on the H+2 molecular ion with fixed nuclei (R = 2.6 a.u.).
3：6 a.u.).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The study uses a CPLP combined with a THz field or a static electric field.
4：Experimental Procedures and Operational Workflow:
The study involves numerical simulations to investigate the HHG process under different laser field conditions.
5：Data Analysis Methods:
The study uses the semi-classical three-step model and time-frequency analysis to analyze the HHG process.
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