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

authored by: Elmar V. Van Der Zwan, Manfred Lein
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.
Organisation(s): Institute of Theoretical Physics
Quest: Centre for Quantum Engineering and Space-Time Research
External Organisation(s): University of Kassel
Type: Article
Journal: Physical Review A - Atomic, Molecular, and Optical Physics
Volume: 82
ISSN: 1050-2947
Publication date: 08.09.2010
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Atomic and Molecular Physics, and Optics
Electronic version(s): http://arxiv.org/pdf/1006.1824" (Access: Open)
https://doi.org/10.1103/PhysRevA.82.033405 (Access: Closed)

BibTeX

@article{4c956864f2ef4e0c8352dcac9fabb4cd,
title = "Two-center interference and ellipticity in high-order harmonic generation from H2+",
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.",
author = "{Van Der Zwan}, {Elmar V.} and Manfred Lein",
note = "Copyright: Copyright 2010 Elsevier B.V., All rights reserved.",
year = "2010",
month = sep,
day = "8",
doi = "10.1103/PhysRevA.82.033405",
language = "English",
volume = "82",
journal = "Physical Review A - Atomic, Molecular, and Optical Physics",
issn = "1050-2947",
publisher = "American Physical Society",
number = "3",
}