L’INSTABILITE BRILLOUIN DANS LES LASERS A FIBRE DOPEE DE PUISSANCE
Journal: Journal of Fundamental and Applied Sciences (Vol.4, No. 1)Publication Date: 2012-06-30
Authors : D. M. Bouras A. Kellou H. Leblond F. Sanchez;
Page : 39-44
Keywords : Stimulated Brillouin Scattering; high power fiber lasers; instabilities; quasi periodic.;
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.
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