Generation of Isolated Attosecond Pulse from Asymmetric Molecular Ions by Introducing Half-Cycle-Like Laser Fields
LIU Sha-Sha, MIAO Xiang-Yang**
College of Physics and Information Engineering, Shanxi Normal University, Linfen 041004
Abstract ：We propose an efficient method for the generation of an isolated attosecond pulse from the asymmetric molecular ions HeH2+ by adding a half-cycle-like field (HCLF) to the fundamental driving laser field. The high-order harmonic generation (HHG) is investigated by numerically solving the time-dependent Schr?dinger equation. By performing the time-frequency distributions and the electronic wave packet probability densities, we find that the optimizing combined field is not only useful for extending the HHG cutoff, but also for simplifying the recombination channels through controlling the electron localization. In addition, by adjusting the intensity of the HCLF, a dominant short quantum path is selected to contribute the HHG spectrum. As a result, a 75-as isolated attosecond pulse is obtained by superposing a proper range of the harmonics.
收稿日期: 2015-02-26
出版日期: 2015-06-30
:
33.80.Rv
(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
31.30.Gs
(Hyperfine interactions and isotope effects)
42.50.Hz
(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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2015, Vol. 32 
