GUSTAVE , François

Dissipative solitons (DS) are self-localized wave-packets appearing in spatially extended dissipative systems. In optics, all the DS that have been observed in propagative systems can be cast in two categories, depending on the presence or absence of an external forcing, i.e. the phase symmetry is broken or not. In forced systems, DS are locked...

Self-mixing interferometry is a well established interferometric measurement technique. In spite of the robustness and simplicity of the concept, interpreting the self-mixing signal is often complicated in practice, which is detrimental to measurement availability. Here we discuss the use of a convolutional neural network to reconstruct the...

Laser self-mixing is in principle a simple and robust general purpose interferometric method, with the additional expressivity which results from nonlinearity. However, it is rather sensitive to unwanted changes in target reflectivity, which often hinders applications with non-cooperative targets. Here we analyze experimentally a multi-channel...

The modes properties of highly multimode optical fibre are governed by the rays' dynamics in the geometrical limit. Different regimes of dynamics are encountered by modifying the geometry of the transverse cross section of the fibers. We show that the selection of modes in a highly multimode fiber can be simplied thanks to the signature of the...

Modelocked lasers constitute the fundamental source of optically-coherent ultrashort-pulsed radiation, with huge impact in science and technology. Their modeling largely rests on the master equation (ME) approach introduced in 1975 by Hermann A. Haus. However, that description fails when the medium dynamics is fast and, ultimately, when...

Le soliton de Peregrine est une solution exacte de l'equation de Schrödinger non linéaire à une dimension en régime focalisant. Cette solution, caractérisée par un fond continu non nul, apparait comme un cas limite de l'instabilité modulationnelle. Sur le plan expérimental, il est possible de générer le soliton de Peregrine à partir de la...