Abstract

We have tuned the whispering-gallery modes of a fused-silica microresonator over nearly 1  nm at 800  nm, i.e., over half a free spectral range, or 106 linewidths of the resonator. This result has been achieved by use of a new method based on the stretching of a two-stem microsphere. We describe devices that will permit new cavity QED experiments with this high-Q optical resonator when it is desirable to optimize its coupling to emitters with given transition frequencies. The demonstrated tuning capability is compatible with both UHV and low-temperature operation, which should be useful for future experiments with laser-cooled atoms or single quantum dots.

© 2001 Optical Society of America

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