Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Proceedings of the International Quantum Electronics Conference and Conference on Lasers and Electro-Optics Pacific Rim 2011
  • (Optica Publishing Group, 2011),
  • paper J133

Sapphire Whispering Gallery Mode Resonators at Milli-Kelvin Temperature

Not Accessible

Your library or personal account may give you access

Abstract

Single crystal sapphire exhibits extremely high electrical and mechanical Q-factors (~109 at 4K), which are important characteristics for electromechanical experiments at the quantum limit. We report the first cool down of a bulk sapphire sample below super fluid liquid helium temperature (1.6K) to as low as 25mK. The electromagnetic properties were characterized at microwave frequencies over a broad range of excitation powers. At high powers we report the observation of thermal bistability in millikelvin sapphire due to the material properties such as the T3 dependence on thermal conductivity and the ultra-low dielectric loss tangent of the material. We identify “magic temperatures" between 80 to 2100 mK , the lowest ever measured, at which the onset of bistability is suppressed. At very low excitation strength (E/ ω~1) measurements were sensitive enough to measure saturation effects due to a highly detuned electron spin resonance, which limited the loss tangent of the material to about 2×10−8 at 13.868 and 13.259 GHz. Small power dependent frequency shifts were also measured, which corresponds to an added magnetic susceptibility of order 10−9. This work shows that quantum limited microwave resonators with Q-factors >108 are possible by implementing sapphire whispering gallery modes. These phenomena at low temperatures make sapphire suitable for a host of quantum metrology applications.

© 2011 AOS

PDF Article
More Like This
Spectral Properties of Rare-Earth-Ion Doped Whispering Gallery Mode Resonators

D. L. McAuslan, D. Korystov, and J. J. Longdell
I1046 International Quantum Electronics Conference (IQEC) 2011

Experimental observation of whispering gallery modes in novel silicon microcylindrical resonators

N. Vukovic, N. Healy, P. Horak, G. S. Murugan, J. R. Sparks, P. J. A. Sazio, J. V. Badding, and A. C. Peacock
CE5_3 The European Conference on Lasers and Electro-Optics (CLEO/Europe) 2011

Low-threshold Optical Parametric Oscillations in a Whispering Gallery Mode Resonator

J. U. Fürst, D. V. Strekalov, D. Elser, A. Aiello, U. L. Andersen, Ch. Marquardt, and G. Leuchs
CD11_1 The European Conference on Lasers and Electro-Optics (CLEO/Europe) 2011

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved