Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Matter at Low Temperature: Poster Session
TT 7.3: Poster
Montag, 25. Februar 2008, 14:00–18:00, Poster B
High mechanical Q-factor measurements on silicon bulk material — •Christian Schwarz1, Ronny Nawrodt1, Daniel Heinert1, Anja Schroeter1, Ralf Neubert1, Matthias Thürk1, Wolfgang Vodel1, Andreas Tünnermann2, and Paul Seidel1 — 1Institut für Festkörperphysik, Helmholtzweg 5, D-07743 Jena, Germany — 2Institut für Angewandte Physik, Albert-Einstein-Straße 15, D-07745 Jena, Germany
The direct observation of gravitational waves is one of the biggest challenges in science. Current detectors are limited by different kinds of noise. One of the fundamental noise sources is thermal noise arising from the optical components. One of the most promising attempts to reduce the thermal noise contribution in future detectors will be the use of high Q-factor materials at cryogenic temperatures. Silicon seems to be the most interesting material due to its excellent optical and thermal properties. We present high Q-factor measurements on bulk samples of high purity silicon in a temperature range from 5 to 300 K. The sample dimensions vary between 76.2 mm × 12...75 mm. The Q-factor exceeds 4· 108 at 6 K. The influence of the crystal orientation, doping and the sample preparation on the Q-factor is discussed.
This work is supported by the German science foundation under contract SFB Transregio 7.