Microtorus: a High Finesse Microcavity with Whispering-Gallery Modes

Details Microtorus: a High Finesse Microcavity with Whispering-Gallery Modes Microtorus: a High Finesse Microcavity with Whispering-Gallery Modes

2000-09-28

arxiv.org/abs/physics/0009092v1

Physics

Optics

11 pages, 3 figures

Scientific paper

10.1364/OL.26.000256

We have demonstrated a 165 micron oblate spheroidal microcavity with free spectral range 383.7 GHz (3.06nm), resonance bandwidth 25 MHz (Q ~ 10^7) at 1550nm, and finesse F > 10^4. The highly oblate spheroidal dielectric microcavity combines very high Q-factor, typical of microspheres, with vastly reduced number of excited whispering-gallery (WG) modes (by two orders of magnitude). The very large free spectral range in the novel microcavity - few hundred instead of few GigaHertz in typical microspheres - is desirable for applications in spectral analysis, narrow-linewidth optical and RF oscillators, and cavity QED.

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