Nano-Kelvin thermometry and temperature control: beyond the thermal noise limit
Date
2014
Authors
Weng, W.
Anstie, J.
Stace, T.
Campbell, G.
Baynes, F.
Luiten, A.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Physical Review Letters, 2014; 112(16):160801-1-160801-5
Statement of Responsibility
Wenle Weng, James D. Anstie, Thomas M. Stace, Geoff Campbell, Fred N. Baynes, and Andre N. Luiten
Conference Name
Abstract
We demonstrate thermometry with a resolution of 80 nK/Hz using an isotropic crystalline whispering-gallery mode resonator based on a dichroic dual-mode technique. We simultaneously excite two modes that have a mode frequency ratio that is very close to two (±0.3 ppm). The wavelength and temperature dependence of the refractive index means that the frequency difference between these modes is an ultrasensitive proxy of the resonator temperature. This approach to temperature sensing automatically suppresses sensitivity to thermal expansion and vibrationally induced changes of the resonator. We also demonstrate active suppression of temperature fluctuations in the resonator by controlling the intensity of the driving laser. The residual temperature fluctuations are shown to be below the limits set by fundamental thermodynamic fluctuations of the resonator material.
School/Discipline
Dissertation Note
Provenance
Description
Published 21 April 2014
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Rights
© 2014 American Physical Society