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Interactions Brillouin et Kerr dans de nouvelles fibres optiques adaptées à des applications dans l'infrarouge proche et moyen

Abstract : During the last decade, it is worth to mention the significant evolution of the spectral coverage of compact coherent laser sources towards the mid-infrared, in particular stimulated by spectroscopy and bio-photonic applications. The present thesis is part of this development through the investigation of specialty optical fibers designed to bridge the gap between the near-infrared and mid-infrared regions, especially for wavelengths around 2 μm. These fibers based on tellurite glasses or heavily germanium-doped silica fibers exhibit advantageous nonlinear characteristics for the development of laser systems or frequency conversion devices, by using the stimulated Brillouin scattering and Kerr effect. Our experimental measurements reveal a significant increase of Brillouin efficiency (up to 67 times higher) when compared to standard telecom silica fibers. We demonstrate the possibility of developing Brillouin fiber lasers with linewidths and thresholds about few tens of kilohertz and hundreds of mW, respectively. Such Brillouin laser cavities can also generate optical frequency combs by multiple four-wave mixing. The resulting spectral sources are shown to be symmetrical, stable and frequency-tunable. Finally, we show that the highly doped silica fibers have the distinctive feature of reduced sensitivity of the Brillouin shift to the mechanical tensile strain and temperature. In particular, the high 98 mol % doping level makes possible to obtain a temperature-insensitive elastic frequency at wavelengths of 1.55 and 2 μm. This athermal behavior is fundamental to discriminate the effects of temperature and mechanical strain in the field of fiber sensors.
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Koffi Deroh. Interactions Brillouin et Kerr dans de nouvelles fibres optiques adaptées à des applications dans l'infrarouge proche et moyen. Optique [physics.optics]. Université Bourgogne Franche-Comté, 2019. Français. ⟨NNT : 2019UBFCD053⟩. ⟨tel-02964777⟩

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