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Laser parameters effects of pump-probe pulse on improvements of spectral continuum and attosecond pulse signal from H2+

  • Hang Liu
  • Rich-Liqiang Feng
  • Henry J. KapteynEmail author
Regular Article
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Abstract

Generally, by properly choosing the delay time of the pump-probe field, the harmonic yield from H2+ can be enhanced due to the charge-resonance-enhanced-ionization. In this paper, through controlling the laser parameters of pump-probe pulse, the improvements of spectral continuum and attosecond pulse signal from H2+ have been further investigated. For the case of controlling pump pulse, it is found that the harmonic yield of H2+ can be enhanced as the pump pulse duration increases. However, as the pump wavelength increases, although the harmonic cutoff can be extended, the harmonic yield is decreased. Furthermore, when the carrier envelope phase of pump pulse is chosen to be 1.0π, the intensity of spectral continuum can be further enhanced slightly. For the case of controlling probe pulse, it is shown that the harmonic cutoff can be extended when the probe pulse duration increases. Moreover, by properly adding a down-chirp in the probe pulse, the harmonic cutoff can be further extended, showing a broader spectral continuum with a stable intensity. Furthermore, with the introduction of inhomogeneous effect of the laser field, a larger harmonic cutoff can be found and a spectral continuum with a bandwidth of 116 eV can be obtained. Moreover, the signal of this spectral continuum is only contributed by a single harmonic emission peak. Finally, through the Fourier transformation of some selected harmonics on this spectral continuum, a single attosecond pulse with the duration of 48 as can be obtained.

Graphical abstract

Keywords

Optical Phenomena and Photonics 

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Copyright information

© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Hang Liu
    • 1
    • 2
  • Rich-Liqiang Feng
    • 1
    • 2
  • Henry J. Kapteyn
    • 1
    • 3
    Email author
  1. 1.Laboratory of Molecular Reaction Dynamics, Liaoning University of TechnologyJinzhouP.R. China
  2. 2.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics Chinese Academy of SciencesDalianP.R. China
  3. 3.Department of Chemical and Environmental Engineering ,Marmara UniversityIstanbulTurkey

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