研究目的
Investigating the spectral splitting and phase matching of the macroscopic high-order harmonic generation in intense laser fields.
研究成果
The study demonstrates that the harmonic spectral and spatial profiles split with increasing driving laser intensity, primarily due to propagation distortions and phase matching effects. The splitting is dependent on the focus-gas-jet relative position and is less observable in neon due to its high ionization energy. The findings highlight the importance of phase matching in the overall emission of high-order harmonic generation.
研究不足
The study is limited to argon and neon gaseous mediums under specific laser parameters. The spectral splitting phenomenon is dependent on the propagation effects and the ionization energy of the gas, which may not be generalizable to all conditions.
1：Experimental Design and Method Selection:
The study involves numerically solving the three-dimensional macroscopic propagation equation to investigate the high-order harmonic generation in argon gaseous medium. The theoretical analysis includes the phase matching to understand the physical mechanisms of harmonic splitting.
2：Sample Selection and Data Sources:
The target atom is Argon, with a comparison made to Neon gas jet due to its high ionization energy.
3：List of Experimental Equipment and Materials:
An 800-nm, 45-fs Gaussian laser field is used with a driving field beam waist of 32μm. The argon gas jet is placed at z = -3 mm with a pressure of 0.3bars.
4：3bars.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser- field and the harmonic-field propagation in a macroscopic medium are described by three-dimensional Maxwell’s equations in cylindrical coordinate separately. The HHG spectrum is proportional to the modulus squared of the Fourier transform of the time-dependent induced dipole moment.
5：Data Analysis Methods:
The phase mismatching requirement is evaluated to understand the contributions of different quantum paths in HHG from the spectrally and spatially resolved harmonic spectra.
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