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Controling the coupling properties of active ultrahigh-Q WGM microcavities from undercoupling to selective amplification

Abstract : Ultrahigh-quality (Q) factor microresonators have a lot of applications in the photonics domain ranging from low-threshold nonlinear optics to integrated optical sensors. 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 a few 10^8 . Here we show that an optical gain provided by erbium ions can compensate for residual losses. Moreover it is possible to control the coupling regime of an ultrahigh Q-factor three port microresonator from undercoupling to spectral selective amplification by changing the pumping rate. The optical characterization method is based on frequency-swept cavity-ring-down- pectroscopy. This method allows the transmission and dispersive properties of perfectly transparent microresonators and intrinsic finesses up to 4.0x10^7 to be measured. Finally we characterize a critically coupled fluoride glass WGM microresonator with a diameter of 220 mm and a loaded Q-factor of 5.3x10^9 is demonstrated.
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Alphonse Rasoloniaina, Vincent Huet, Thi Kim Ngan Nguyen, Elodie Le Cren, Michel Mortier, et al.. Controling the coupling properties of active ultrahigh-Q WGM microcavities from undercoupling to selective amplification. Scientific Reports, Nature Publishing Group, 2015, 4 (1), pp.4023. ⟨10.1038/srep04023⟩. ⟨hal-01358975⟩

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