Développement de sources supercontinuum et applications biomédicales
Fibres optiques en verre de borophosphate de niobium pour des applications en optique non linéaire
Les principaux objectifs de cette thèse étaient de développer des fibres optiques de borophosphate riche en niobium avec une qualité optique améliorée ainsi que de tirer profit de leur haute non linéarité pour des applications comme dispositifs de guides d'ondes dans le proche infrarouge. Les travaux exposés dans cette thèse traitent d’aspects théo...
Ultraviolet supercontinuum generation driven by ionic coherence in a strong laser field
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Published in Nature Communications
Supercontinuum generation can be utilized for light source development. Here the authors demonstrate ultraviolet supercontinuum generation from ions due to strong field ionization and multiphoton resonance effect.
Quantum model for supercontinuum generation process
Published in Scientific Reports
A quantum theory is established for the propagation of electromagnetic waves in highly nonlinear dispersive optical fibers. By applying the method recently presented dispersion terms and retarded response of the medium are included for the propagation of light in a fiber in this work. A coupled stochastic generalized nonlinear Schrödinger equation ...
Supercontinuum generation in a nonlinear ultra-silicon-rich nitride waveguide
Published in Scientific Reports
Supercontinuum generation is demonstrated in a 3-mm-long ultra-silicon-rich nitride (USRN) waveguide by launching 500 fs pulses centered at 1555 nm with a pulse energy of 17 pJ. The generated supercontinuum is experimentally characterized to possess a high spectral coherence, with an average | g 12| exceeding 0.90 across the wavelength range of the...
Enhanced coherent transition radiation from midinfrared-laser-driven microplasmas
Published in Scientific Reports
We present a particle-in-cell (PIC) analysis of terahertz (THz) radiation by ultrafast plasma currents driven by relativistic-intensity laser pulses. We show that, while the I 0 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upg...
Two octave supercontinuum generation in a non-silica graded-index multimode fiber.
Published in Nature communications
The generation of a two-octave supercontinuum from the visible to mid-infrared (700-2800 nm) in a non-silica graded-index multimode fiber is reported. The fiber design is based on a nanostructured core comprised of two types of drawn lead-bismuth-gallate glass rods with different refractive indices. This yields an effective parabolic index profile ...
Probing the dispersive properties of optical fibers with an array of femtosecond-written fiber Bragg gratings
Published in Scientific Reports
We propose an efficient method to determine the effective refractive index of step-index optical fibers from the visible to the mid-IR and thus allowing to infer their dispersive properties over a broad spectral range. The validity of the method, based on the writing of an array of fiber Bragg gratings (FBGs) with known periods using the fs scannin...
Imagerie multimodale assistée par champ électrique pulsé
La stimulation des cellules biologiques et des tissus par des impulsions électriques courtes de haute tension induit une modification de la perméabilité de la membrane cellulaire et autorise le passage de divers éléments chimiques et/ou biologiques dans les cellules.Ces effets de perméabilisation membranaire dépendent de la forme et de la durée de ...
Intracavity incoherent supercontinuum dynamics and rogue waves in a broadband dissipative soliton laser
Published in Nature Communications
In this work the authors perform a combined numerical and experimental study of noise-like pulse multiscale instabilities in dissipative laser systems. They reveal an underlying multiscale dynamics and report the observation of rogue wave events.
