Bottle microresonator with actively stabilized evanescent coupling

Abstract

The evanescent coupling of light between a whispering-gallery-mode bottle microresonator and a subwavelength-diameter coupling fiber is actively stabilized by means of the Pound–Drever–Hall technique. We demonstrate the stabilization of a critically coupled resonator with a control bandwidth of $0.1\mathrm{Hz}$, yielding a residual transmission of $(9\pm 3)\times {10}^{-3}$ for more than an hour. Simultaneously, the frequency of the resonator mode is actively stabilized.

© 2011 Optical Society of America

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