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Theses

Étude d’effets optiques non linéaires d’ordres 2 et 3 dans des nanofibres optiques

Abstract : In this PhD thesis we study 2nd and 3rd order optical non-linearities in optical nanofibers, which are obtained by stretching standard fibers until their diameter becomes of the order of magnitude of the wavelength. The first application is the realization of wavelength converters in the visible range in the sub-ns regime, range which is only minimally covered by pulsed sources. The principle of these converters is to use stimulated Raman scattering in the evanescent field immersed in a liquid. By defining and optimizing their operating range, we have reach external conversion efficiencies from the pump at 532 nm to the first Stokes order of ethanol at 630 nm near to 60%. The performances of our converters are very repeatable and open the way to a new family of very compact, reliable and all-fibered components.The second application is the study of a source of correlated photon pairs for quantum telecommunications. Our source is based of parametric fluorescence on the surface of a silica nanofiber. In the phase-matching we propose, the pump wave is emitted on the mode TM01 at 775 nm and the photon pairs are emitted around1.5 μm in the fundamental mode, enabling a recoupling with only a few losses in the optical network. Our study mainly concern the choice of the standard fiber enabling to optimize the efficiency of the mechanism, the conception of the nanofiber and its tapers as well as the implementation of preliminary experiments for the excitation of high ordrer modes.
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Submitted on : Monday, May 17, 2021 - 7:33:08 AM
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  • HAL Id : tel-03227123, version 1

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Maha Bouhadida. Étude d’effets optiques non linéaires d’ordres 2 et 3 dans des nanofibres optiques. Optique [physics.optics]. Université Paris-Saclay, 2021. Français. ⟨NNT : 2021UPASP019⟩. ⟨tel-03227123⟩

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