High-order harmonic generation in laser-aligned molecules

N. Hay, R. Velotta, M. Lein, R. de Nalda, E. Heesel, M. Castillejo, and J. P. Marangos
Phys. Rev. A 65, 053805 – Published 19 April 2002
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Abstract

We demonstrate high-order harmonic generation in high-density vapors of laser-aligned molecules. Ensembles of aligned CS2 and N2 are formed in the focus of a 300 ps duration laser pulse with sufficient density (1017 molecules cm3) to enable efficient high-order harmonic generation by a second, 70-fs, high-intensity laser pulse. We are able to modulate and significantly enhance the harmonic intensity in aligned molecules compared to the randomly oriented case. Our results are explained by considering the influence of an anisotropic dipole phase. Strong support for this interpretation is provided by theoretical results for high-order harmonic generation in the aligned H2+ model system.

  • Received 21 December 2001

DOI:https://doi.org/10.1103/PhysRevA.65.053805

©2002 American Physical Society

Authors & Affiliations

N. Hay1,*, R. Velotta1,†, M. Lein1, R. de Nalda1, E. Heesel1, M. Castillejo2, and J. P. Marangos1

  • 1The Blackett Laboratory, Imperial College of Science, Technology and Medicine, London SW7 2BW, United Kingdom
  • 2Instituto de Química-Física Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain

  • *Corresponding author. Email address: n.hay@ic.ac.uk
  • Present address: Istituto Nazionale Fisica della Materia, Dipartimento Scienze Fisiche, Via Cintia, 26-80126-Napoli, Italy.

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Vol. 65, Iss. 5 — May 2002

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