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Contrôle de l'auto-organisation de la lumière dans un système photoréfractif à rétro-action optique

Abstract : The aim of the present manuscript is to study the formation and the control of transverse structures in nonlinear optical systems by using photorefractive materials as the optical nonlinear medium. A single laser beam entering in such a nonlinear medium can experience transverse structuring due to the mechanisms of modulation instability, which may lead to beam filamentation. In another case, the interaction of two beams may lead to spatially regular patterns, as in the case of the single-feedback configuration. In this study, we focus on the conditions for the appearance of ordered patterned structures and describe the theoretical and experimental background for the observation of these effects. Our challenge is to go beyond the observation, classification and understanding of the nonlinear phenomena encountered. We are especially interested in the properties of the free-running nonlinear system, combined with different control mechanisms. Principally, on one hand, we focus on the active addressing, selection and orientation of a desired pattern by suitably using a periodic photonic structures as the control mechanisms. On the other hand, the dynamics, the geometry, and the velocity of the different patterns are strongly influenced by an imposed misalignment of the mirror producing the optical feedback. Consequently, convective dynamics, sustained by noise, are expected in the system and will be observed for the first time in a photorefractive experiment. Finally, a part of the manuscript is devoted to the observation of localized structures. Potentially useful for optical memories, these structures have been intensively studied in different configurations, but experiments in photorefractive materials remain scarce. Thus, we will focus on the possible inscription of such structures in our pattern-forming-system.
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Submitted on : Tuesday, January 18, 2011 - 3:26:33 PM
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  • HAL Id : tel-00557118, version 1

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Nicolas Marsal. Contrôle de l'auto-organisation de la lumière dans un système photoréfractif à rétro-action optique. Physique [physics]. Université de Metz, 2010. Français. ⟨tel-00557118⟩

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