Bound-Electron Nonlinearity Beyond the Ionization Threshold

J. K. Wahlstrand, S. Zahedpour, A. Bahl, M. Kolesik, and H. M. Milchberg
Phys. Rev. Lett. 120, 183901 – Published 2 May 2018
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Abstract

We present absolute space- and time-resolved measurements of the ultrafast laser-driven nonlinear polarizability in argon, krypton, xenon, nitrogen, and oxygen up to ionization fractions of a few percent. These measurements enable determination of the strongly nonperturbative bound-electron nonlinear polarizability well beyond the ionization threshold, where it is found to remain approximately quadratic in the laser field, a result normally expected at much lower intensities where perturbation theory applies.

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  • Received 10 February 2018

DOI:https://doi.org/10.1103/PhysRevLett.120.183901

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

J. K. Wahlstrand1,2, S. Zahedpour1, A. Bahl3, M. Kolesik3, and H. M. Milchberg1,*

  • 1Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA
  • 2Engineering Physics Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 3College of Optical Sciences, University of Arizona, Tucson, Arizona 85712, USA

  • *Corresponding author. milch@umd.edu

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Issue

Vol. 120, Iss. 18 — 4 May 2018

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