The effect of chirp-delay regulation on diatomic molecular harmonic generation

Abstract

Abstract: In order to obtain high order harmonic spectra with high-intensity, a method of chirp-delay regulation is proposed to control the harmonic intensity of H2+ and D2+. The results show that, when driven by shorter pulse duration, the harmonic spectra of H2+ and D2+ mainly come from the falling-regionof laser field. Therefore, by properly introducing a chirp in the falling-region of laser field, the high-intensity spectral continuum can be obtained, and the harmonic intensity of H2+ is higher than that of D2+. However, when driven by longer pulse duration, the main contribution of harmonic spectra of H2+ and D2+ may come from both the rising and falling regions of laser field. Thus, the high-intensity spectral continuum can be produced by introducing the chirps in the rising or falling regions of laser field, and the harmonic intensity of H2+ is lower than that of D2+ in this case. Finally, by selecting the appropriate spectral continuum and superposing the harmonics, a single attosecond pulse with the pulse duration of 36 as can be obtained.

Key words: laser physics, high-order harmonic generation, frequency-chirping pulse, diatomic molecule, attosecond light sources

CLC Number:

O562.4

ZHANG Yiwen, LIU Hang, †, FENG Liqiang. The effect of chirp-delay regulation on diatomic molecular harmonic generation[J]. Chinese Journal of Quantum Electronics, 2020, 37(3): 314-320.

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