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Q: Fachverband Quantenoptik und Photonik
Q 53: Poster Photonik
Q 53.10: Poster
Donnerstag, 13. März 2008, 16:30–19:00, Poster C2
Towards tunable high-Q whispering-gallery-mode resonators — •Michael Pöllinger, Danny O’Shea, Florian Warken, and Arno Rauschenbeutel — Institut für Physik, Universität Mainz, Staudingerweg 7, 55128 Mainz
We present experimental results on the fabrication and characterization of tunable whispering-gallery-mode resonators. These so-called bottle resonators are highly prolate and exhibit an advantageous mode geometry and spectrum [1]. They are realized from glass fibers, which are flame heated and elongated to produce a 15 µm diameter waist. The resonator structure is then obtained by focused CO2 laser heating. The resonators are spectrally characterized in a setup where light is coupled in and out by means of micron sized coupling fibers. Furthermore, this setup allows us to tune the resonance frequency by applying mechanical strain. Tuning over more than one free spectral range and quality factors in the Q = 106–107 range have been observed.
Our current efforts aim at enhancing Q. Therefore, we fabricate resonators from different ultra-pure commercial glass fibers, investigate the surface properties by TEM imaging and quantitatively investigate the spatial mode structure of the resonator. Achieving Q-factors in the 108–109 range together with the special features of the resonator would open interesting perspectives for cQED experiments and ultralow-power optical switches.
We acknowledge financial support by the DFG research unit 557.
Y. Louyer, D. Meschede, and A. Rauschenbeutel, Phys. Rev. A 72, 031801(R) (2005).