Abstract

Splitting of high-Q whispering gallery modes into a doublet of counterpropagating modes was observed in a resonator fabricated from LiNbO3. An energy-transfer rate of 10โ€‰MHz was calculated by measuring the frequency detuning of the doublet structure. The splitting rate is also used to calculate the maximum variation in the internal index of refraction over one wavelength, which is of the order of 10โˆ’7. This shows that the mechanical process used to fabricate whispering-gallery-mode resonators from LiNbO3 is sufficient to achieve material-limited quality factors.

© 2007 Optical Society of America

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