Nano-Kelvin Thermometry and Temperature Control: Beyond the Thermal Noise Limit

Wenle Weng, James D. Anstie, Thomas M. Stace, Geoff Campbell, Fred N. Baynes, and Andre N. Luiten
Phys. Rev. Lett. 112, 160801 – Published 21 April 2014

Abstract

We demonstrate thermometry with a resolution of 80nK/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 (±0.3ppm). 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.

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  • Received 16 July 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.160801

© 2014 American Physical Society

Authors & Affiliations

Wenle Weng1,2,*, James D. Anstie2,1, Thomas M. Stace3, Geoff Campbell4, Fred N. Baynes1, and Andre N. Luiten2,1

  • 1School of Physics, University of Western Australia, Western Australia 6009, Australia
  • 2Institute for Photonics and Advanced Sensing and School of Chemistry and Physics, University of Adelaide, South Australia 5005, Australia
  • 3School of Mathematics and Physics, University of Queensland, Brisbane, Queensland 4072, Australia
  • 4Department of Quantum Science, Australian National University, Australian Capital Territory 0200, Australia

  • *wlweng@physics.uwa.edu.au

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Vol. 112, Iss. 16 — 25 April 2014

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