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ETUDE DE L'EFFET BRILLOUIN EN CAVITE LASER

Abstract : This study serves to understand the origin of the instabilities observed experimentally in the high power double cladding fiber lasers. The irnplementation of a kinetic model which describes the spatiotemporal evolution of the intensity of a high power fiber laser in the presence of the scattering Brillouin was studied in the first part. The Fabry-Perot laser cavity was considered. It is established by two rnirrors what drives to the existence of two laser waves which propagate in opposite sense, as well as of two Stokes waves associated with the waves lasers. The presence of al1 these waves under the curve of gain requires the consideration of the saturation crossed between the waves laser and the waves Stokes. The most important original result of this study is that in the presence of the stimulated scattering Brillouin, the ytterbium doped fiber laser presents an auto-impulsive functioning in the case of a cavity to strong losses without any absorbent saturable. For the case of cavity with low losses the dynamics presents a continuous functioning whatever the rate of pumping. The f i e n c e of the stimulated scattering Brillouin in a laser cavity with low losses was studied numerically in the second part, by using the model of the coupled amplitudes and by taking into account the dynamics of the acoustic wave. Rich and complex dynamic are observed.
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https://tel.archives-ouvertes.fr/tel-00662516
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Submitted on : Tuesday, January 24, 2012 - 1:16:28 PM
Last modification on : Monday, November 14, 2022 - 2:50:07 AM
Long-term archiving on: : Wednesday, April 25, 2012 - 2:30:27 AM

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  • HAL Id : tel-00662516, version 1

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Djouher Mallek. ETUDE DE L'EFFET BRILLOUIN EN CAVITE LASER. Physique Quantique [quant-ph]. Université d'Angers, 2011. Français. ⟨NNT : ⟩. ⟨tel-00662516⟩

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