Open AccessSingle attosecond pulse generated by atom exposed to two laser pulses with the same color and half cycle pulses
Author(s) -
Pan Hui-Ling,
Peng-Cheng Li,
Xiaoxin Zhou
Publication year - 2011
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.60.043203
Subject(s) - harmonic spectrum , helium atom , physics , attosecond , laser , pulse (music) , harmonic , high harmonic generation , atomic physics , optics , spectral line , atom (system on chip) , position (finance) , electron , helium , ultrashort pulse , quantum mechanics , finance , detector , computer science , economics , embedded system
By solving numerically the time-dependent Schrödinger equation with the split-operator method, we investigate the characteristic of the high-order harmonic of one-dimensional helium atom exposed to two laser pulses with the same color and half cycle pulses. It is shown that the harmonic spectrum is extended to Ip+9.6Up in the case of the combined fields, and an isolated 63 as pulse can be obtained by superposing the high-order harmonic spectra generated around the cut-off position. An analysis shows that the plateau of the high-order harmonic spectrum is extended greatly and the contribution of the long electron trajectory is suppressed by adding the half cycle pulses.