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

Li, Peng-Cheng; Sheu, Yae-Lin; Laughlin, Cecil; Chu, Shih-I

doi:10.1038/ncomms8178

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

Journal Article · Wed May 20 00:00:00 EDT 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms8178· OSTI ID:1623976

Li, Peng-Cheng ^[1]; Sheu, Yae-Lin ^[2]; Laughlin, Cecil ^[3]; Chu, Shih-I ^[4]

National Taiwan Univ., Taipei (Taiwan). Dept. of Physics. Center for Advanced Study in Theoretical Sciences. Center for Quantum Science and Engineering; Northwest Normal univ., Lanzhou (China). College of Physics and Electronic Engineering; Univ. of Kansas, Lawrence, KS (United States). Dept. of Chemistry; DOE/OSTI
National Taiwan Univ., Taipei (Taiwan). Dept. of Physics. Center for Advanced Study in Theoretical Sciences. Center for Quantum Science and Engineering
Univ. of Nottingham (United Kingdom). School of Mathematical Science
National Taiwan Univ., Taipei (Taiwan). Dept. of Physics. Center for Advanced Study in Theoretical Sciences. Center for Quantum Science and Engineering; Univ. of Kansas, Lawrence, KS (United States). Dept. of Chemistry

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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-00ER41132

OSTI ID:: 1623976

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 6; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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