Open AccessIsolated attosecond pulse generated by a model helium atom exposed to the combined field
Author(s) -
Huang Feng,
Peng-Cheng Li,
Xiaoxin Zhou
Publication year - 2012
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.61.233203
Subject(s) - attosecond , helium atom , high harmonic generation , physics , harmonics , atomic physics , laser , pulse (music) , electron , field (mathematics) , atom (system on chip) , helium , pulse duration , harmonic , optics , ultrashort pulse , quantum mechanics , voltage , mathematics , detector , pure mathematics , computer science , embedded system
We theoretically study the high-order harmonic generation (HHG) of a model He atom exposed to a combined field of 1600 nm and 800 nm laser pulses. The changing of rising rate and falling rate with time for the combined filed during main HHG, can present the different characteristics of high-order harmonic generation from the short electron trajectories and the long electron trajectories. By superimposing several harmonics generated from He atom driven by the combined field, we could obtain shorter attosecond pulses. Finally, by adjusting the time delay between two laser pulses, we can effectively suppress the contribution of the short electron trajectories to HHG, and obtain an isolated attosecond pulse with duration 33.7 as.