Coulomb focusing in above-threshold ionization in elliptically polarized midinfrared strong laser fields

Chengpu Liu and Karen Z. Hatsagortsyan
Phys. Rev. A 85, 023413 – Published 21 February 2012

Abstract

The role of Coulomb focusing in above-threshold ionization in an elliptically polarized midinfrared strong laser field is investigated within a semiclassical model incorporating tunneling and Coulomb field effects. It is shown that Coulomb focusing up to moderate ellipticity values (ξ0.3) is dominated by multiple forward scattering of the ionized electron by the atomic core that creates a characteristic low-energy structure in the photoelectron spectrum and is responsible for the peculiar energy scaling of the ionization normalized yield along the major polarization axis. At higher ellipticities, the electron continuum dynamics is disturbed by the Coulomb field effect mostly at the exit of the ionization tunnel. Due to the latter, the normalized yield is found to be enhanced, with the enhancement factor being sharply pronounced at intermediate ellipticities.

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  • Received 26 September 2011

DOI:https://doi.org/10.1103/PhysRevA.85.023413

©2012 American Physical Society

Authors & Affiliations

Chengpu Liu* and Karen Z. Hatsagortsyan

  • Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany

  • *Chengpu.Liu@mpi-hd.mpg.de
  • K.Hatsagortsyan@mpi-k.de

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Issue

Vol. 85, Iss. 2 — February 2012

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