Two-center interference and ellipticity in high-order harmonic generation from H2+

Elmar V. van der Zwan and Manfred Lein
Phys. Rev. A 82, 033405 – Published 8 September 2010

Abstract

We present a theoretical investigation into the two-center interference in aligned H2+. The influence of the laser field on the recombination step is investigated by comparing laser-induced harmonic generation with harmonic generation from field-free collisions of Gaussian wave packets with the core. We find that for different Gaussian wave packets colliding with the molecule, the interference minimum occurs at the same alignment angle. The same result is obtained for the laser-induced spectrum when only a single electronic trajectory per harmonic contributes. When multiple electronic trajectories contribute, we find an effect on the minimum position because the interference between short and long trajectories is alignment dependent. The two-center interference and the influence of the Coulombic potential are clearly seen not only in the harmonic intensity and phase but also in the polarization direction and ellipticity. We observe significant ellipticity of the emitted radiation around the two-center interference minimum.

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  • Received 9 June 2010

DOI:https://doi.org/10.1103/PhysRevA.82.033405

©2010 American Physical Society

Authors & Affiliations

Elmar V. van der Zwan1,2,* and Manfred Lein1

  • 1Institut für Theoretische Physik and Centre for Quantum Engineering and Space-Time Research (QUEST), Leibniz Universität Hannover, Appelstraße 2, D-30167 Hannover, Germany
  • 2Institut für Physik, Universität Kassel, Heinrich-Plett-Straße 40, D-31432 Kassel, Germany

  • *ezwan@itp.uni-hannover.de

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Vol. 82, Iss. 3 — September 2010

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