Études expérimentales de dispositifs intégrés à base de micro-résonateurs à mode de galerie en verres actifs

Abstract : Glass-based whispering gallery mode (WGM) microresonators are easy to produce by melting techniques. However, they suffer from surface contamination which limits their long term quality factor to only about 10E8. In this thesis, we show that an optical gain provided by erbium ions can compensate for residual losses. The optical characterization method is based on frequency-swept “Cavity-Ring-Down-Measurement”. This method can fully describe the linear properties of microcavities such as coupling regime and group delay. In compensation loss regime we demonstrate that it is possible to control the coupling regime of an ultrahigh Q-factor microresonator from undercoupling to spectral selective amplification. Under the selective amplification regime, we obtain an internal Q-factor exceding 10E10. In selective amplification, we experimentally show that it is possible to obtain high amplification up to 33 dB and a high group delay. The microresonators with high Q-factor and high finesse could give rise to a modal coupling which exhibits a splitting of the resonance in the transmission. A characterization of this phenomenon with the cavity ring down method was realized. Moreover, these microresonators, are conducive to the non-linear effect observation. A model incorporating the thermal effect and the Kerr effect has been achieved. Confrontation between theory and experiment allowed us to estimate the real optical power injected into the mode as well as estimating the mode volume.
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Alphonse Rasoloniaina. Études expérimentales de dispositifs intégrés à base de micro-résonateurs à mode de galerie en verres actifs. Autre [cond-mat.other]. Université Rennes 1, 2014. Français. ⟨NNT : 2014REN1S014⟩. ⟨tel-01009345v2⟩

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