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Conception et réalisation d'une source impulsionnelle à fibre dopée Erbium-Ytterbium millijoule de grande brillance spectrale

Abstract : The goal of this PhD work is to provide a set of models helping to understand the physics of pulsed fiber lasers with high spectral brightness. Using these models, pulsed Erbium-Ytterbium fiber sources have been designed for coherent lidar applications.
Pulsed source dynamics with pulse duration ranging from nanosecond to microsecond has been analyzed in the first part of this study. The influence of parasitic reflections at low repetition rate (a few kilohertz) has been demonstrated. Thermal effects in strongly pumped Erbium-Ytterbium fiber lasers have also been studied. When the signal intensity is large enough, the main non linear effect,
Stimulated Brillouin Scattering (SBS) limits the extractable energy. We have developed in the second
part of this work an original model which takes into account the SBS dynamics in a fiber amplifier.
The guided propagation of the acoustic waves was included. A proper modeling of longitudinal acoustic waves was proposed. In order to increase the SBS threshold, fibers with a larger core can be used. These fibers guide a few modes. A trade off between spatial beam quality and peak power has to be found. Using our modeling, we have designed a pulsed fiber sources
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https://tel.archives-ouvertes.fr/tel-00150684
Contributor : Guillaume Canat <>
Submitted on : Thursday, May 31, 2007 - 11:51:24 AM
Last modification on : Tuesday, March 16, 2021 - 3:42:04 PM
Long-term archiving on: : Friday, September 21, 2012 - 4:00:10 PM

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  • HAL Id : tel-00150684, version 1

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Guillaume Canat. Conception et réalisation d'une source impulsionnelle à fibre dopée Erbium-Ytterbium millijoule de grande brillance spectrale. Physique Atomique [physics.atom-ph]. Ecole nationale superieure de l'aeronautique et de l'espace, 2006. Français. ⟨tel-00150684⟩

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