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Habilitation à diriger des recherches

Propagation non-linéaire d'impulsions laser ultrabrèves dans l'atmosphère et applications
Des filaments blancs pour sonder l'atmosphère

Abstract : When ultrashort (fs), high-power laser pulses propagate through the atmosphere, extended plasma filaments form and emit white light in a spectral range spanning from the ultraviolet (230 nm) to the infrared (4,5 µm). This strongly non-linear optical phenomenon results from a dynamical balance between respectively focusing and defocusing Kerr- and plasma-lenses, which are formed by a non-uniform, intensity-dependent refractive index across the laser beam profile. My recent work presented here has mainly been dedicated to the study of this non-linear propagation and its applications to atmospheric sciences.
Some applications such as white-light LIDAR rely on the white light continuum, which can be observed up to high altitudes and allows multicomponent remote sensing. Other techniques rely on the ability of the filaments to deliver high-intensities and induce non-linear optical effects at remote locations. This property allowed us to remotely identify bioaerosols or solid targets. Furthermore, the ionization of the fs-laser-induced filaments permits to control high-voltage discharges, opening the way to laser lightning rods.
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Habilitation à diriger des recherches
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https://tel.archives-ouvertes.fr/tel-00011448
Contributor : Jérôme Kasparian <>
Submitted on : Monday, January 23, 2006 - 5:03:19 PM
Last modification on : Thursday, October 15, 2020 - 9:00:22 AM
Long-term archiving on: : Saturday, April 3, 2010 - 7:40:42 PM

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  • HAL Id : tel-00011448, version 1

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Jérôme Kasparian. Propagation non-linéaire d'impulsions laser ultrabrèves dans l'atmosphère et applications
Des filaments blancs pour sonder l'atmosphère. Physique [physics]. Université Claude Bernard - Lyon I, 2005. ⟨tel-00011448⟩

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