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Propagation des solitons spatio-temporels dans les milieux dissipatifs

Abstract : This thesis presents a semi-analytical approach for the search of (3+1)D spatio-temporal soliton solutions of the complex cubic-quintic Ginzburg-Landau equation (GL3D).We use a semi-analytical method called collective coordinate approach, to obtain an approximate profile of the unknown pulse field. This ansatz function is chosen to be a function of a finite number of parameters describing the light pulse.By applying this collective corrdinate procedure to the GL3D equation, we obtain a system of variational equations which give the evolution of the light bullet parameters as a function of the propagation distance. We show that the collective coordinate approach is uncomparably faster than the direct numerical simulation of the propagation equation. This permits us to obtain, efficiently, a global mapping of the dynamical behavior of light bullets, which unveils a rich variety of dynamical states comprising stationary, pulsating and rotating light bullets.Finally the existence of several types of light bullets is predicted in specific domains of the equation parameters. Altogether, this theoretical and numerical work may be a useful tool next to the efforts undertaken these last years observing light bullets experimentally.
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Aladji Kamagate. Propagation des solitons spatio-temporels dans les milieux dissipatifs. Autre [cond-mat.other]. Université de Bourgogne, 2010. Français. ⟨NNT : 2010DIJOS068⟩. ⟨tel-00671172⟩

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