Comportement dynamique de diodes laser de puissance multimodes à 980 nm soumises à un retour optique sélectif en fréquence provenant d’un réseau de Bragg photoinscrit

Abstract : In this thesis, we have studied spectrums and the dynamics properties of a high-powerlaser diode emitting at 980 subject to optical feedback via a fibre Bragg grating (FBG). In such a configuration, FBG is a key element of this work because it establishes an ex-ternal cavity with a reflection like a mirror on one hand and it is a filter which provides frequency selective optical feedback (FOF : Filtered Optical Feedback) at around 980 nm on the other hand. We are interested in investigating this FOF configuration for a project in a collaboration between 3S Photonics Group and the Laboratoire de Physique des Lasers.In order to observe, identify and understand its dynamical behaviours, especially low frequency fluctuations (LFF), the experimental studies have been undertaken particularly with time series from an oscilloscope, RF spectra from an RF spectrum analyser and optical spectra from an optical spectrum analyser and Fabry-Perot interferometer. Onlyfew studies have been done with this FOF laser system and our thesis work may allow new technical and scientific understanding for recent application, particularly application to Erbium-doped fibre amplifier.
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Fadwa Baladi. Comportement dynamique de diodes laser de puissance multimodes à 980 nm soumises à un retour optique sélectif en fréquence provenant d’un réseau de Bragg photoinscrit. Physique [physics]. Université Sorbonne Paris Cité, 2015. Français. ⟨NNT : 2015USPCD111⟩. ⟨tel-02179289⟩

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