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High mechanical Q-factor measurements on calcium fluoride at cryogenic temperatures

Published online by Cambridge University Press:  22 February 2007

R. Nawrodt ,
A. Zimmer ,
T. Koettig ,
S. Nietzsche ,
M. Thürk ,
W. Vodel  and
P. Seidel
R. Nawrodt*
Affiliation:
Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany
A. Zimmer
Affiliation:
Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany
T. Koettig
Affiliation:
Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany
S. Nietzsche
Affiliation:
Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany
M. Thürk
Affiliation:
Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany
W. Vodel
Affiliation:
Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany
P. Seidel
Affiliation:
Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany
*
ronny.nawrodt@uni-jena.de
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Abstract

Mechanical Q-factor measurements of single crystalline calcium fluoride CaF2 bulk material are presented. Resonant modes between 27 and 100 kHz were investigated on a cylindrical test sample ($\varnothing$$75~{\rm mm} \times 75~{\rm mm}$). For selected modes low temperature measurements of the mechanical Q-factor were done within a temperature range from 5 to 300 K. For the Q-measurements a ring-down technique was used. The substrate was suspended as a pendulum by means of a tungsten wire loop. The highest Q-factor has been achieved around 60 K with 3 × 108 which is the highest Q-factor reported on CaF2 up to now.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 38 , Issue 1 , April 2007 , pp. 53 - 59
Copyright
© EDP Sciences, 2007

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