Nondipole effects in photon emission by laser-driven ions

C. C. Chirilă, N. J. Kylstra, R. M. Potvliege, and C. J. Joachain
Phys. Rev. A 66, 063411 – Published 20 December 2002
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Abstract

The influence of the magnetic-field component of the incident pulse on the emission of photons by multiply charged ions interacting with intense, near-infrared laser pulses is investigated theoretically using a strong-field approximation that treats the coupling of the atom with the incident field beyond the dipole approximation. For peak pulse intensities approaching 1017Wcm2, the electron drift in the laser propagation direction due to the magnetic-field component of the incident pulse strongly influences the photon emission spectra. In particular, emission is reduced and the plateau structure of the spectra modified, as compared to the predictions in the dipole approximation. Nondipole effects become more pronounced as the ionization potential of the ion increases. Photon emission spectra are interpreted by analysing classical electron trajectories within the semiclassical recollision model. It is shown that a second pulse can be used to compensate the magnetic-field induced drift for selected trajectories so that, in a well-defined spectral region, a single attosecond pulse is emitted by the ion.

  • Received 19 September 2002

DOI:https://doi.org/10.1103/PhysRevA.66.063411

©2002 American Physical Society

Authors & Affiliations

C. C. Chirilă, N. J. Kylstra, and R. M. Potvliege

  • Department of Physics, University of Durham, Durham DH1 3LE, United Kingdom

C. J. Joachain

  • Physique Théorique CP 227, Université Libre de Bruxelles, B–1050 Brussels, Belgium
  • Max-Planck-Institute für Quantenoptik, D-85748 Garching, Germany

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Vol. 66, Iss. 6 — December 2002

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