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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik

Q 15.24: Poster

Montag, 14. März 2011, 16:30–19:30, P1

Full active stabilization of an evanescently coupled ultra-high Q whispering-gallery-mode microresonator-nanofiber system — •Christian Junge, Danny O'Shea, Sebastian Nickel, Konstantin Friebe, and Arno Rauschenbeutel — Technische Universität Wien - Atominstitut, Stadionallee 2, 1020 Wien, Austria

We have experimentally solved the issue of operating an ultra-high Q whispering-gallery-mode microresonator under highly stable and reproducible conditions concerning both its resonance frequency and the evanescent in- and out-coupling of light by means of an optical nanofiber. For this purpose, we have implemented a double Pound-Drever-Hall scheme that allows us to derive two unambiguous error signals. Using these signals, we actively stabilize the resonator frequency to an external reference while, simultaneously, the resonator-nanofiber gap and thus the evanescent in- and out-coupling of light is actively stabilized to a fixed value. We characterize the performance of our method and demonstrate that it also works under ultra-high vacuum conditions. These results are highly relevant for the use of whispering-gallery-mode bottle microresonators in cavity quantum electrodynamics experiments.

Financial support by the DFG, the Volkswagen Foundation, and the ESF is gratefully acknowledged.