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Controlling double ionization of atoms in an intense bichromatic laser pulse

A. Kamor1, F. Mauger2, C. Chandre2, and T. Uzer1

  • 1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA
  • 2Centre de Physique Théorique, CNRS, Aix-Marseille Université, Campus de Luminy, case 907, 13288 Marseille cedex 09, France

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Phys. Rev. E 83, 036211 – Published 31 March, 2011

DOI: https://doi.org/10.1103/PhysRevE.83.036211

Abstract

We consider the classical dynamics of a two-electron system subjected to an intense bichromatic linearly polarized laser pulse. By varying the parameters of the field, such as the phase lag and the relative amplitude between the two colors of the field, we observe several trends from the statistical analysis of a large ensemble of trajectories initially in the ground-state energy of the helium atom: high sensitivity of the sequential double-ionization component, low sensitivity of the intensities where nonsequential double ionization occurs, while the corresponding yields can vary drastically. All these trends hold irrespective of which parameter is varied: the phase lag or the relative amplitude. We rationalize these observations by an analysis of the phase-space structures that drive the dynamics of this system and determine the extent of double ionization. These trends turn out to be mainly regulated by the dynamics of the inner electron.

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Phys. Rev. E 83, 036211– Published 31 March, 2011
  • Received 8 November 2010

©2011 American Physical Society

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