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Dynamical origin of near- and below-threshold harmonic generation of Cs in an intense mid-infrared laser field

Author

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  • Peng-Cheng Li

    (Center for Quantum Science and Engineering, and Center for Advanced Study in Theoretical Sciences, National Taiwan University
    College of Physics and Electronic Engineering, Northwest Normal University
    University of Kansas)

  • Yae-Lin Sheu

    (Center for Quantum Science and Engineering, and Center for Advanced Study in Theoretical Sciences, National Taiwan University)

  • Cecil Laughlin

    (School of Mathematical Science, University of Nottingham)

  • Shih-I Chu

    (Center for Quantum Science and Engineering, and Center for Advanced Study in Theoretical Sciences, National Taiwan University
    University of Kansas)

Abstract

Near- and below-threshold harmonic generation provides a potential approach to generate vacuum-ultraviolet frequency comb. However, the dynamical origin of in these lower harmonics is less understood and largely unexplored. Here we perform an ab initio quantum study of the near- and below-threshold harmonic generation of caesium (Cs) atoms in an intense 3,600-nm mid-infrared laser field. Combining with a synchrosqueezing transform of the quantum time-frequency spectrum and an extended semiclassical analysis, the roles of multiphoton and multiple rescattering trajectories on the near- and below-threshold harmonic generation processes are clarified. We find that the multiphoton-dominated trajectories only involve the electrons scattered off the higher part of the combined atom-field potential followed by the absorption of many photons in near- and below-threshold regime. Furthermore, only the near-resonant below-threshold harmonic is exclusive to exhibit phase locked features. Our results shed light on the dynamic origin of the near- and below-threshold harmonic generation.

Suggested Citation

  • Peng-Cheng Li & Yae-Lin Sheu & Cecil Laughlin & Shih-I Chu, 2015. "Dynamical origin of near- and below-threshold harmonic generation of Cs in an intense mid-infrared laser field," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8178
    DOI: 10.1038/ncomms8178
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