Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 21: Solids at Low Temperature - Poster Session
TT 21.18: Poster
Mittwoch, 28. März 2007, 14:00–17:45, Poster A
Mechanical Loss Measurements on Calcium Fluoride Bulk Material at Low Temperatures — •Christian Schwarz1, Ronny Nawrodt1, Anja Zimmer1, Sandor Nietzsche1, Wolfgang Vodel1, Andreas Tünnermann2, and Paul Seidel1 — 1Friedrich-Schiller-University Jena - Institute of Solid State Physics, Helmholtzweg 5, 07743 Jena, Germany — 2Friedrich-Schiller-University - Institute of Applied Physics, Albert-Einstein-Straße 15, 07745 Jena, Germany
Interferometric gravitational wave detectors are one of the most sensitive devices ever developed. The detectors currently in use are limited by different kinds of noise. One of the fundamental noise sources is thermal noise. To lower thermal noise within the detection band it is necessary to use low mechanical loss materials as optical components.
One promissing candidate as a low loss material is calcium fluoride. Detailed measurements of the mechanical loss of single crystal calcium fluoride samples (Dia. 76.2 mm × 75 mm) are presented within a temperature range from 5 to 300 K. The lowest loss was observed at 65 K as 3.6× 10−9. Possible damping mechanisms are discussed and compared with the experimental results.
This work was supported by the DFG under contract SFB Transregio 7.