Abstract
We demonstrate a oblate spheroidal microcavity with a free spectral range of 383.7 GHz (3.06 nm), a resonance bandwidth of 23 MHz (quality factor ) at 1550 nm, and finesse . The highly oblate spheroidal dielectric microcavity combines a very high factor, typical of microspheres, with a vastly reduced number of excited whispering-gallery modes (by 2 orders of magnitude). The very large free spectral range in this novel microcavity–a few hundred gigahertz instead of a few gigahertz as in typical microspheres—is desirable for applications in spectral analysis, narrow-linewidth optical and rf oscillators, and cavity QED.
© 2001 Optical Society of America
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