Nonsymmetric laser-pulse propagation in capillary tubes with variable radius

M. Veysman, N. E. Andreev, G. Maynard, and B. Cros
Phys. Rev. E 86, 066411 – Published 20 December 2012

Abstract

A model describing the nonsymmetrical laser-pulse propagation in capillary tubes with inner radius smoothly varying with the capillary length is proposed. Using this model, the use of capillaries with specially profiled entrance sections (particularly cone matching elements) for improving the coupling of the laser energy into a capillary and avoiding capillary ablation is analyzed. It is shown that cone entrances with a sufficiently small angle (αcone10 mrad) help decrease the longitudinal energy flux and ablation of the entrance face of a capillary, but do not remove the requirements on the precision of laser-pulse focusing necessary to obtain regular laser fields, characterized by a symmetrical intensity distribution, centered on the capillary axis. To achieve regular laser fields without strong transverse gradients, the angle between the laser and capillary axes has to be smaller than 1 mrad for capillaries with an inner radius of the order of tens of microns.

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  • Received 24 October 2012

DOI:https://doi.org/10.1103/PhysRevE.86.066411

©2012 American Physical Society

Authors & Affiliations

M. Veysman1, N. E. Andreev1,2, G. Maynard3, and B. Cros3

  • 1Institute for High Energy Densities, Moscow, Russia
  • 2Moscow Institute of Physics and Technology (State University), Moscow 113303, Russia
  • 3Laboratoire de Physique des Gaz et des Plasmas, CNRS, Université Paris–Sud 11, 91405 Orsay, France

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Issue

Vol. 86, Iss. 6 — December 2012

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