Half-cycle waveform control for generating ultra-wide harmonic spectral plateau

YUAN Quan; FENG Liqiang; LIU Hang

doi:10.7510/jgjs.issn.1001-3806.2021.04.009

LASER TECHNOLOGY > 2021 > 45(4): 463-469. > DOI: 10.7510/jgjs.issn.1001-3806.2021.04.009

YUAN Quan, FENG Liqiang, LIU Hang. Half-cycle waveform control for generating ultra-wide harmonic spectral plateau[J]. LASER TECHNOLOGY, 2021, 45(4): 463-469. DOI: 10.7510/jgjs.issn.1001-3806.2021.04.009

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Half-cycle waveform control for generating ultra-wide harmonic spectral plateau

1.
College of Science, Liaoning University of Technology, Jinzhou 121001, China
2.
School of Chemical and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, China

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Received Date: June 17, 2020
Revised Date: August 24, 2020
Published Date: July 24, 2021

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Abstract

Abstract

In order to obtain intense and broad harmonic spectral plateau, by numerical solution of time-dependent Schrödinger equation, the half-cycle waveform control for producing the optimal half-cycle harmonic emission conditions was proposed by using multi-color combined field. The results show that, by controlling the chirps of two-color field, the optimal negative half-cycle waveform can be obtained; while, by controlling the chirp delay, the optimal positive half-cycle waveform can be produced. Driven by the above waveforms, the harmonic cutoffs can be extended. Further, with the introduction of ultraviolet pulse, due to the ultraviolet resonance enhanced ionization, the harmonic intensity can be enhanced. Furthermore, when the ultraviolet energy meets the single and two photon resonance enhanced ionization, the harmonic intensity is remarkably enhanced. With the decrease of ultraviolet photon energy, the enhancement of harmonic intensity decreases. Finally, the single attosecond pulses of sub-50as can be obtained by superposing harmonics on the harmonic spectral plateau. The results are helpful for the control of high-order harmonic generation and the production of attosecond pulses.
- laser optics,
- high-order harmonic generation,
- attosecond pulse,
- half-cycle waveform control,
- multi-color combined field

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References

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Half-cycle waveform control for generating ultra-wide harmonic spectral plateau

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