Skip to Main content Skip to Navigation
Theses

Propagation non-linéaire d'impulsions laser ultra-courtes dans les milieux transparents

Abstract : We present different aspects of the propagation of ultrashort laser pulses in transparent media.
First, we derive the propagation equations starting from the Maxwell equations. We remind of the
main physical phenomena undergone by ultrashort and powerful laser pulses. First self-focusing
occurs, owing to the Kerr response of the medium. This self-focusing is stopped by plasma generation
from the laser-induced ionization of the ambient atoms. The propagation of the wave generates a
supercontinuum through self-phase modulation. We recall the main results concerning the simple
and multiple filamentations of an intense wave, induced by the beam inhomogeneities and which take
place as soon as the beam power is above critical. In a second part, we investigate the influence
of high-order nonlinearities on the propagation of the beam and especially on its filamentation
pattern. To control the multifilamentation process, we investigate in a third part the propagation of beams
with special designs, namely; Gradient- and vortex-shaped beams. We justify the robustness of this
latter kind of optical objects. Eventually, we investigate multifilamentation patterns of femtosecond
pulses in a fog tube and in cells of ethanol doped with coumarine, for different beam configurations.
Document type :
Theses
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00134895
Contributor : Antoine Vinçotte <>
Submitted on : Monday, March 5, 2007 - 4:55:37 PM
Last modification on : Thursday, January 11, 2018 - 6:12:27 AM
Long-term archiving on: : Friday, September 21, 2012 - 12:30:09 PM

Identifiers

  • HAL Id : tel-00134895, version 1

Collections

IMB | CNRS

Citation

Antoine Vinçotte. Propagation non-linéaire d'impulsions laser ultra-courtes dans les milieux transparents. Sciences de la Terre. Université Sciences et Technologies - Bordeaux I, 2006. Français. ⟨tel-00134895⟩

Share

Metrics

Record views

230

Files downloads

1362