Dynamical origin of near- and below-threshold harmonic generation of Cs in an intense mid-infrared laser field
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.
- Authors:
-
- 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
- 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
- Publication Date:
- Research Org.:
- Univ. of Kansas, Lawrence, KS (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1623976
- Grant/Contract Number:
- FG02-00ER41132
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Science & Technology - Other Topics
Citation Formats
Li, Peng-Cheng, Sheu, Yae-Lin, Laughlin, Cecil, and Chu, Shih-I. Dynamical origin of near- and below-threshold harmonic generation of Cs in an intense mid-infrared laser field. United States: N. p., 2015.
Web. doi:10.1038/ncomms8178.
Li, Peng-Cheng, Sheu, Yae-Lin, Laughlin, Cecil, & Chu, Shih-I. Dynamical origin of near- and below-threshold harmonic generation of Cs in an intense mid-infrared laser field. United States. https://doi.org/10.1038/ncomms8178
Li, Peng-Cheng, Sheu, Yae-Lin, Laughlin, Cecil, and Chu, Shih-I. Wed .
"Dynamical origin of near- and below-threshold harmonic generation of Cs in an intense mid-infrared laser field". United States. https://doi.org/10.1038/ncomms8178. https://www.osti.gov/servlets/purl/1623976.
@article{osti_1623976,
title = {Dynamical origin of near- and below-threshold harmonic generation of Cs in an intense mid-infrared laser field},
author = {Li, Peng-Cheng and Sheu, Yae-Lin and Laughlin, Cecil and Chu, Shih-I},
abstractNote = {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.},
doi = {10.1038/ncomms8178},
journal = {Nature Communications},
number = 1,
volume = 6,
place = {United States},
year = {Wed May 20 00:00:00 EDT 2015},
month = {Wed May 20 00:00:00 EDT 2015}
}
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