Microtorus: a High Finesse Microcavity with Whispering-Gallery Modes
Vladimir S. Ilchenko, Michael L. Gorodetsky, X. Steve Yao, Lute Maleki
Abstract
We have demonstrated a 165 micron oblate spheroidal microcavity with free spectral range 383.7 GHz (3.06nm), resonance bandwidth 25 MHz (Q ~ 107) at 1550nm, and finesse F > 104. 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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