Eric Louvergneaux

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PhD - Master - Postdoc

 

 

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Eric LOUVERGNEAUX

Associate Professor

Nonlinear Dynamics of Optical Systems group
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Laboratoire de Physique des Lasers, Atomes et Molécules

UFR de Physique, Bâtiment P5

Université Lille1

59655 Villeneuve d'Ascq cedex (France)

Tel :      +33 320 336 443

Fax :     +33 320 337 020

Email :  eric.louvergneaux@univ-lille1.fr

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Nonlinear optical experimental lab

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- 2 single mode CW Verdi lasers @ 532 nm

- Nonlinear media : homemade nematic liquid crystal slices (Kerr equivalent)

E. Louvergneaux, V. Odent, M. I. Kolobov, M. Taki, Phys Rev A 87, 063802 (2013)

We study numerically and experimentally the highly nonlinear dynamical regime (far above the primary instability threshold) of a one-dimensional spatially extended feedback system. The spatiotemporal dynamics is characterized by the emission of a spatial frequency supercontinuum accompanied by the appearance of abnormally intense localized peaks in transverse patterns. We find that the statistics of these peak intensities is described very well by the generalized gamma (GG) probability density function and determine its three parameters which are used as quantitative indicators of the transition from the weakly to the highly nonlinear regime. Most interestingly, we discover that in the highly nonlinear regime the GG PDF converges to the gamma probability density function with the shape parameter equal to 3/2. This limit corresponds to the Rayleigh probability density function of the peak amplitudes for the oceanic waves.

Experimental PDFs and their Generalized Gamma fits

Research interests

Keywords: Pattern formation, convective and absolute instabilities, noise-sustained structures, dissipative solitons, localized structures, noise effects, modulational instabilities, feedback, liquid crystals, Kerr medium, fibre ring resonator, extended systems, spatiotemporal dynamics, nonlinear optics, optical rogue waves.

Dissipative Solitons and Localized Structures

Optical Rogue Waves

Convective and Absolute Instabilities in Extended Optical Systems

Noise Effects in Spatiotemporal Systems

Pattern Formation in Liquid Crystals with Optical Feedback

Temporal Instabilities in Fibre Ring Resonators

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Coordinator of the "COLORS international project" of French Research National Agency (ANR)

COLORS: Control of Optical LOcalized and Rare Structures

In this project, we develop control methods and strategies for the optical localized structures arising in nonlinear passive optical experiments such as shaping the patterns, switching between different coexisting structures, displacing them transversally, or else controlling rare intense events (such as optical rogue waves) that can occur in spatiotemporal systems and that can have dramatic consequences. The research will imply to a large extend fundamental studies, both theoretical and experimental, on the nature of the structures under investigation and on the definition of their distinctive features. It will imply as well technological developments on the control of optical structures, such as controlling their dynamics by using convectively traveling regimes, increase or decrease the degree of interaction, shaping a single structure or clusters of them, studying the effects of inherent noise on their dynamics, controlling spatial extreme events. Therefore, we expect that the results of the project will also have an impact on future applications in the field of optical control and optical storage. As mentioned before, we plan to study the statistics and properties of spatial localized intense events in different experimental configurations such as cavity and feedback systems. More specifically, we will explore their localization properties as well as the influence of the convective nature of the system in their statistical properties

 

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Revised on 11-08