Bound-Electron Nonlinearity beyond the Ionization Threshold

J. K. Wahlstrand, S. Zahedpour, A. Bahl, M. Kolesik, H. M. Milchberg

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


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.

Original languageEnglish (US)
Article number183901
JournalPhysical review letters
Issue number18
StatePublished - May 2 2018

ASJC Scopus subject areas

  • General Physics and Astronomy


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