Mechanisms of two-color laser-induced field-free molecular orientation

Michael Spanner, Serguei Patchkovskii, Eugene Frumker, Paul Corkum

Research output: Contribution to journalArticlepeer-review

Abstract

Two mechanisms of two-color (ω+2ω) laser-induced field-free molecular orientation, based on the hyperpolarizability and ionization depletion, are explored and compared. The CO molecule is used as a computational example. While the hyperpolarizability mechanism generates small amounts of orientation at intensities below the ionization threshold, ionization depletion quickly becomes the dominant mechanism as soon as ionizing intensities are reached. Only the ionization mechanism leads to substantial orientation (e.g., on the order of cosθ0.1). For intensities typical of laser-induced molecular alignment and orientation experiments, the two mechanisms lead to robust, characteristic timings of the field-free orientation wave-packet revivals relative to the alignment revivals and the revival time. The revival timings can be used to detect the active orientation mechanism experimentally.

Original languageAmerican English
Article number113001
JournalPhysical Review Letters
Volume109
Issue number11
DOIs
StatePublished - 12 Sep 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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