Etienne GENIER : "Development of low-noise visible to near-infrared fiber-based supercontinuum source"

PhD works of Etienne GENIER : "Development of low-noise visible to near-infrared fiber-based supercontinuum source"

Due to the current situation, the defence is public but only available via: https://live.femto-st.fr/

Abstract :This Ph.D thesis focuses on the development of a low-noise visible near-infrared fiber-based supercontinuum source. Firstly, we give a complete theoretical, numerical and experimental description of coherent supercontinuum generation in polarization-maintaining fiber all-normal dispersion photonic crystal fiber. Then, exploiting several numerical simulations, we demonstrate a short available parameter space to obtain a low-noise supercontinuum source. This parameter space is extremely limited by the technical laser noise such as amplitude noise, phase noise, and pulse duration noise. The limiting factor is mainly the input pulse duration of the laser which can induce the generation of stimulated Raman scattering components for long pulse duration. Via a detailed experimental and numeral analysis of the impact of input polarization on supercontinuum generation, we present, for the first time to our knowledge, the possibility to generate cross-phase modulation instability in an all-normal dispersion polarization-maintaining fiber. Finally, we display different all-normal dispersion supercontinuum generation systems using commercially available femtosecond seed laser. Finally, using different noise measurement setups, we demonstrate that we obtained the most stable supercontinuum spectrum. Our works represent a fundamental study of low-noise supercontinuum generation in all-normal dispersion fiber and lead to the development of industrial system for biomedical and metrology applications.

Jury composition : M. Arnaud Mussot, Professeur des Universités, Université de Lille, Reporter ;
M. Alexander Heidt, Associate Professor, University of Bern, Reporter ;
M. Maxime Jacquot, Professeur des Universités, Université de Bourgogne Franche-Comté, Reviewer ;
M. Ole Bang, Professor, Technical University of Denmark, Reviewer ;
M. Mariusz Klimczak, Assistant Professor, University of Warsaw, Reviewer ;
M. John Dudley, Professor, Université de Bourgogne Franche-Comté, Co-director ;
M. Thibaut Sylvestre, Directeur de recherche, Université de Bourgogne Franche-Comté, Director 

Localization : Amphithéâtre J.J Gagnepain, Bâtiment TEMIS, 15B, Avenue des Montboucons, Besançon