Molecular alignment and filamentation: Comparison between weak- and strong-field models

N. Berti, P. Béjot, J.-P. Wolf, and O. Faucher
Phys. Rev. A 90, 053851 – Published 26 November 2014

Abstract

The impact of nonadiabatic laser-induced molecular alignment on filamentation is numerically studied. Weak- and strong-field models of impulsive molecular alignment are compared in the context of nonlinear pulse propagation. It is shown that the widely used weak-field model describing the refractive index modification induced by impulsive molecular alignment accurately reproduces the propagation dynamics providing that only a single pulse is involved during the experiment. On the contrary, it fails at reproducing the nonlinear propagation experienced by an intense laser pulse traveling in the wake of a second strong laser pulse. The discrepancy depends on the relative delay between the two pulses and is maximal for delays corresponding to half the rotational period of the molecule.

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  • Received 15 July 2014

DOI:https://doi.org/10.1103/PhysRevA.90.053851

©2014 American Physical Society

Authors & Affiliations

N. Berti1,2, P. Béjot1,*, J.-P. Wolf2, and O. Faucher1

  • 1Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne, Boîte Postale 47870, 21078 Dijon, France
  • 2Université de Genève, GAP-Biophotonics, Chemin de Pinchat 22, 1211 Geneva 4, Switzerland

  • *pierre.bejot@u-bourgogne.fr

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Vol. 90, Iss. 5 — November 2014

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