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Sources optiques infrarouges impulsionnelles ultra-courtes et spectralement ultra-larges générées par effet Raman dans les fibres creuses

Abstract : Gas-filled Hollow-Core Photonic Crystal Fibers (HC-PCF) are efficient tools regarding ultra-wide and coherent optical frequency combs by Stimulated Raman Scattering (SRS). Coherence is reached thanks to highly transient regime as it allows amplification, from quantum to macroscopic level, of a unique spatial and temporal mode (TSM). This results in the generation of Stokes waves with a well-determined phase. The present work details on which time scale coherence can subsist, between two consecutive pulses. The possibility of making a new kind of mode-lock is studied. Then the extreme versatility of gas-filled HC-PCF is illustrated by presenting different kind of new laser sources, exploiting different nonlinear phenomena as Raman and optical Kerr effects. Both ultra-broad and infrared sources are proposed. Then, ultra-short optical wave synthesis is performed. The repetition rate of these pulses is equivalent to the frequency shift of first rotational Raman transition in hydrogen, perfectly showing that ultra-wide Raman frequency combs are coherent. This result is a new step regarding an all-optical waveform generator. Such a device would be of major importance in a future photonic computer.
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David Kergoustin. Sources optiques infrarouges impulsionnelles ultra-courtes et spectralement ultra-larges générées par effet Raman dans les fibres creuses. Optique / photonique. Université de Limoges, 2019. Français. ⟨NNT : 2019LIMO0097⟩. ⟨tel-02476429⟩

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