研究目的
Investigating the role of quantum orbits in odd-even high harmonic generation from atoms in bichromatic laser fields.
研究成果
The interference of two neighboring quantum orbits plays a crucial role in the differing responses of odd and even harmonics to the weak increase of the second harmonic field. A trajectory-resolved approach allows effective control over the emission of odd or even harmonics in a wide HHG energy region, suggesting a potential method for generating attosecond pulses dominated by even harmonics.
研究不足
The study is theoretical and relies on numerical simulations and analytical models. The applicability of the findings to real experimental conditions, considering factors like laser intensity fluctuations and propagation effects, needs further investigation.
1：Experimental Design and Method Selection:
The study involves numerical solution of the time-dependent Schr?dinger equation (TDSE) for a model He atom exposed to bichromatic laser fields. The strong-field approximation (SFA) and quantum-orbit theory (QOT) are employed for analytical insights.
2：Sample Selection and Data Sources:
A model He atom with a soft-core Coulomb potential is used, adjusted to match the ionization potential of the He atom.
3：List of Experimental Equipment and Materials:
The study is theoretical, utilizing numerical methods and analytical models without physical equipment.
4：Experimental Procedures and Operational Workflow:
The TDSE is solved numerically using the spectral method with specific grid sizes and time steps. The HHG spectrum is obtained through Fourier transformation of the dipole acceleration.
5：Data Analysis Methods:
The wavelet transform is used for time-frequency analysis of HHG, and the SFA model is applied to understand the interference effects between quantum orbits.
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