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Phys Rev Lett. 2009 Jul 31;103(5):053901. Epub 2009 Jul 28.

Ultrahigh-Q tunable whispering-gallery-mode microresonator.

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Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.


Typical microresonators exhibit a large frequency spacing between resonances and a limited tunability. This impedes their use in a large class of applications which require a resonance of the microresonator to coincide with a predetermined frequency. Here, we experimentally overcome this limitation with highly prolate-shaped whispering-gallery-mode "bottle microresonators" fabricated from standard optical glass fibers. Our resonators combine an ultrahigh quality factor of 3.6 x 10(8), a small mode volume, and near-lossless fiber coupling, characteristic of whispering-gallery-mode resonators, with a simple and customizable mode structure enabling full tunability.

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