Open AccessEffect of the carrier phase of ultra-short laser pulses on high-order harmonic generation spectra
Author(s) -
Ji-Gen Chen,
Chunqing Gao,
Zeng Si-Liang,
Yu-Jun Yang,
Zhu Qi-ren
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.4104
Subject(s) - laser , spectral line , high harmonic generation , physics , plateau (mathematics) , harmonic , harmonic spectrum , phase (matter) , atomic physics , optics , materials science , quantum mechanics , mathematical analysis , mathematics
We numerically calculated the high-order harmonic generation (HHG) power spectra from a one-dimensional model atom irradiated by linearly polarized ultra-short laser pulses whose duration is two optical cycles. It was found that, the cut-off positions of the HHG spectra change when the carrier phases of the ultra-short laser pulses are altered, and the distinct double plateau structure appears in some special carrier phases. The above issues are reasonably explaned by the three-step model. Finally, the wavelet time-frequency analysis verifies that the three-step model can accurately exactly predict the cut-off frequencies of the ultra-short pulse HHG spectra.