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arXiv · 0901.4921

Ultra-high-Q tunable whispering-gallery-mode microresonator

M. Pöllinger·D. O'Shea·F. Warken·A. Rauschenbeutel
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Abstract

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 microcavity 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 ultra-high quality factor of 360 million, a small mode volume, and near lossless fibre coupling, characteristic of whispering-gallery-mode resonators, with a simple and customizable mode structure enabling full tunability.

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M. Pöllinger, D. O'Shea, F. Warken, A. Rauschenbeutel. 2010-07-05. Ultra-high-Q tunable whispering-gallery-mode microresonator. https://doi.org/10.1103/physrevlett.103.053901

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