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L’INSTABILITE BRILLOUIN DANS LES LASERS A FIBRE DOPEE DE PUISSANCE

Journal: Journal of Fundamental and Applied Sciences (Vol.4, No. 1)

Publication Date:

Authors : ;

Page : 39-44

Keywords : Stimulated Brillouin Scattering; high power fiber lasers; instabilities; quasi periodic.;

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Abstract

With the emergence of rare-earth doped fibers, and especially double-clad fibers, there is a renewed interest in Brillouin effect. First of all, the amplification of a continuous signal in a rare-earth doped fiber amplifier can generate high enough intensities to excite Brillouin effect and then to create a backscattered stokes wave. Such back-reflection is detrimental for amplifier applications and consequently it has been studied theoretically and experimentally. Recently, the low frequency self-pulsing instability resulting from Brillouin backscattering has been theoretically modelled [1]. Our main objective is to present a general model allowing to explain the origin of the dynamic instability arising in a fiber lasers as a consequence of Brillouin effect. The effect of Brillouin back scattering is theoretically analysed by two-coupled modes laser model. We consider the Fabry-Perot fiber laser cavity. The rich and complex dynamic behaviours are observed. In particular the quasi periodic dynamic is identified and studied.

Last modified: 2013-06-11 15:39:21