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Nouvelles dynamiques en cavité laser à fibre dopée : auto organisation et lois d'échelles : application à la génération expérimentale d'impulsions ultracourtes à haute cadence contrôlée en cavité laser à fibre dopée

Abstract : Non-linear effects, which depend essentially on the intensity of the electric field of the wave and the guide, are essential for the generation of pulse regimes in doped fiber lasers. The Kerr effect, which occurs regardless of the propagation and pumping energy, will generate the phenomenon of phase auto modulation (SPM), which will result in a spectral expansion. The SPM can also be seen in the interaction between the two waves that propagate along the slow and fast axes of the guide (XPM). In a passive uniform guide, this self-phase modulation in combination with the chromatic dispersion of the guide can lead to the soliton pulse, but this framework must be largely overcome to address pulse shaping in a dissipative system, such as a laser cavity. This extended framework is that of the dissipative soliton. In this work, we reviewed doped optical fiber as an active medium. We presented the physical principle of mode blocking, introducing the virtual saturable absorber based on the non-linear evolution of polarization (ENLP). In the experimental part, we focused more particularly on new high rate dynamics (multi-GHz) of a doped fiber laser with blocked modes. Before presenting and positioning our work, we first focused on what was published on the generation of ultra-short high speed pulse trains. We studied each configuration, ranging from the generation of high-rate harmonic regime by blocking the usual modes to techniques using modulation instability with interferometric filtering (µcavity, F.P, SFBG). In assessing the opportunities for each, we were attracted by the configuration of Mao, published in Sci. Reports, all fiber, which will be the first part of our experimental contribution. Indeed, initially we resumed the work of Mao et al. where the MZI is taken in series in the fundamental cavity. In order to provide more stability, we have proposed another configuration where the MZI is caught in a recirculation loop that will allow more filtering of the cavity modes in phase. This stability of the impulse regime, at high repetition rate, was observed in real time.
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https://tel.archives-ouvertes.fr/tel-02119263
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Submitted on : Friday, May 3, 2019 - 4:28:47 PM
Last modification on : Saturday, May 4, 2019 - 1:11:24 AM
Long-term archiving on: : Thursday, October 3, 2019 - 11:17:16 AM

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  • HAL Id : tel-02119263, version 1

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Rachid Si Fodil. Nouvelles dynamiques en cavité laser à fibre dopée : auto organisation et lois d'échelles : application à la génération expérimentale d'impulsions ultracourtes à haute cadence contrôlée en cavité laser à fibre dopée. Physique [physics]. Université Bourgogne Franche-Comté; Université des Sciences et de la Technologie Houari Boumediene (Algérie), 2017. Français. ⟨NNT : 2017UBFCK058⟩. ⟨tel-02119263⟩

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