• Medientyp: E-Artikel; Sonstige Veröffentlichung
  • Titel: Determination of ionization and tunneling times in high-order harmonic generation
  • Beteiligte: Zhao, Jing [VerfasserIn]; Lein, Manfred [VerfasserIn]
  • Erschienen: College Park, MD : American Physical Society, 2013
  • Erschienen in: Physical Review Letters 111 (2013), Nr. 4
  • Ausgabe: published Version
  • Sprache: Englisch
  • DOI: https://doi.org/10.15488/1965; https://doi.org/10.1103/PhysRevLett.111.043901
  • Schlagwörter: Laser-driven electrons ; Harmonic emissions ; Retrieval methods ; High order harmonic generation ; Classical dynamics ; Numerical solution ; Harmonic generation ; Ionization ; Second-harmonic fields ; Substantial errors
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  • Beschreibung: From the numerical solution of the time-dependent Schrödinger equation, we obtain the times of ionization and return of the laser-driven electron in high-order harmonic generation by probing the dynamics with a second harmonic field polarized orthogonal to the fundamental field and observing the harmonic emission in dependence on the two-color delay. Our retrieval method using complex-time evolution gives ionization and return times in excellent agreement with the quantum-orbit model, while a retrieval based on real-time classical dynamics can introduce substantial errors. Because of the imaginary parts, the harmonic signal polarized along the probe field is nonzero for any two-color delay. The tunneling time can be retrieved under an assumption for the return time. © 2013 American Physical Society.
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