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Harmonic extension and attosecond pulse generation by using the modified three-color chirped pulse

Authors

  • Li-Qiang Feng,

    1. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics Chinese Academy of Sciences, Dalian, China
    2. College of Science, Liaoning University of Technology, Jinzhou, China
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  • Yun-Bo Duan,

    1. Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao, China
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  • Tian-Shu Chu

    Corresponding author
    1. State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics Chinese Academy of Sciences, Dalian, China
    2. Institute for Computational Sciences and Engineering, Laboratory of New Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao, China
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Abstract

Through numerical solution of the quasi-three-dimensional time-dependent Schrödinger equation, the harmonic spectra and attosecond-pulse generation have been theoretically investigated when a model He atom is exposed to the modified three-color chirped field (800 nm+1600 nm+1200 nm). It is found that when the chirp parameters are chosen to be β1 = 0.3 (corresponding to the 800-nm field), β2 = 0.6 (corresponding to the 1600-nm field) and β3 = −0.2 (corresponding to the 1200-nm field), the harmonics have an optimal extension resulting in a 491 eV bandwidth. Further, an isolated 32-as pulse is directly achieved with proper harmonic superposition.

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