Ultrahigh-Q tunable whispering-gallery-mode microresonator.
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.
Pöllinger
M
M
Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany.
O'Shea
D
D
Warken
F
F
Rauschenbeutel
A
A