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Progress report on the development of microwave spectral references at the LPMO

Published online by Cambridge University Press:  15 December 1999

V. Giordano ,
Y. Kersalé ,
O. di Monaco  and
M. Chaubet
V. Giordano*
Affiliation:
Laboratoire de Physique et de Métrologie des Oscillateurs (UPR 3203 CNRS associé à l'Université de Franche Comté), 32 avenue de l'Observatoire, 25044 Besançon Cedex, France
Y. Kersalé
Affiliation:
Laboratoire de Physique et de Métrologie des Oscillateurs (UPR 3203 CNRS associé à l'Université de Franche Comté), 32 avenue de l'Observatoire, 25044 Besançon Cedex, France
O. di Monaco
Affiliation:
Laboratoire de Physique et de Métrologie des Oscillateurs (UPR 3203 CNRS associé à l'Université de Franche Comté), 32 avenue de l'Observatoire, 25044 Besançon Cedex, France
M. Chaubet
Affiliation:
Centre National d'Études Spatiales, 18 avenue E. Belin, 31055 Toulouse Cedex, France
*
giordano@lpmo.univ-fcomte.fr
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Abstract

The Sapphire Whispering Gallery Mode Resonator technology enables the design of microwave oscillators presenting exceptional short term frequency stability. The resonator consists in a Al2O3 monocrystal disk where the electro-magnetical field is efficiently confined thanks to a process analog to the optical total reflection. Due to the low value of the sapphire dielectric losses, Q-factors as high as 200000 at the ambient temperature and better than 10 millions at 77 K is currently obtained. The sapphire resonator constitutes then an ideal frequency reference that can be inserted in an oscillator loop. At the Laboratoire de Physique et de Métrologie des Oscillateurs, we implemented several sapphire resonator oscillators operating at the ambient temperature and at 77 K. We proposed original solutions to solve the Mayn difficulties arising from the sapphire resonator, i.e. the large number of spurious resonances and the large temperature sensitivity.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 8 , Issue 3 , December 1999 , pp. 269 - 274
Copyright
© EDP Sciences, 1999

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