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Abstract

With the numerical solution of the time-dependent Schrodinger equation, we theoretically investigate the high-order harmonic emissions generated by the atoms irradiated by the ultrashort lasers with different wavelengths but the same pondermotive energy. As the driving-laser wavelength increases, the intensity of the high-harmonic emission decreases. Comparing with the harmonic spectra of atoms driven by a 1000-nm-wavelength laser pulse, a new peak structure appears in the spectra of atoms driven by a 5000-nm-wavelength laser wavelength. It is shown by the time-frequency analysis of the harmonic emission, the time-dependent evolution of the electron density, and the time-dependent population analysis of the eigenstate, that the physical mechanism behind the new peak appearing in the harmonic spectra is the interference between the harmonic emission generated by the electrons ionized out of the excited atoms returning to the parent ions and the harmonic emissions resulting from the ground state ionization.

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Authors and contacts

Corresponding author:Yang Yu-Jun,yangyj@jlu.edu.cn

Funds:Project supported by the National Major Research Plan of China (Grant No. 2019YFA0307700) and the National Natural Science Foundation of China (Grant Nos. 12074145, 11627807, 11774129)

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Vol. 71, Issue 23 - 2022-12-05

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