Abstract

We demonstrate a 165μm oblate spheroidal microcavity with a free spectral range of 383.7  GHz (3.06  nm), a resonance bandwidth of 23  MHz (quality factor Q107) at 1550  nm, and finesse F104. The highly oblate spheroidal dielectric microcavity combines a very high Q 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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