Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 7: Superconductivity & Solids At Low Temperature - Poster Session
TT 7.51: Poster
Montag, 27. März 2006, 14:00–17:45, P1
Internal Dissipation of Silicon at Cryogenic Temperatures — •Ronny Nawrodt1, Anja Zimmer1, Sandor Nietzsche1, Wolfgang Vodel1, Tina Clausnitzer2, Ernst-Berhard Kley2, Andreas Tünnermann2, and Paul Seidel1 — 1Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, D-07743 Jena — 2Friedrich-Schiller-Universität Jena, Institut für Angewandte Physik, Albert-Einstein-Strasse 15, D-07745 Jena
Internal dissipation at a certain temperature is the origin of thermal noise. Optical interferometric gravitational wave detectors are sensitivity limited by the thermal noise of their optical components (e.g. end mirrors, cavity couplers, beam splitters). The main contributions to this noise are due to the substrate, the optical coating, and the suspension. The thermal noise can be reduced by cooling to cryogenic temperatures. In addition the overall mechanical quality factor as a measure of dissipation should preferable increase at low temperatures. The experimental details of a new cryogenic apparatus for investigations of the temperature dependency of the dissipation of different substrate materials in the range of 5 to 300 K are presented. The main focus is on silicon as a well suited material for cryogenic optics due to its special low temperature properties. Results on Si[100] and Si[111] are presented and discussed.
This work is supported by the German DFG under contract SFB TR7.