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  Cryogenic Q-factor measurement of optical substrates for optimization of gravitational wave detectors

Nietzsche, S., Nawrodt, R., Zimmer, A., Schnabel, R., Vodel, W., & Seidel, P. (2006). Cryogenic Q-factor measurement of optical substrates for optimization of gravitational wave detectors. Superconductor Science and Technology, 19(5), S293-S296.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4D71-3 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4D72-1
Genre: Conference Paper

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sust6_5_s27.pdf (Publisher version), 298KB
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 Creators:
Nietzsche, S.1, Author
Nawrodt, Ronny, Author
Zimmer, A., Author
Schnabel, Roman2, Author              
Vodel, W., Author
Seidel, Paul, Author
Affiliations:
1External Organizations, ou_persistent13              
2Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              

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 Abstract: Future generations of gravitational wave interferometers are likely to be operated at cryogenic temperatures because one of the sensitivity limiting factors of the present generation is the thermal noise of end mirrors and beam splitters that occurs in the optical substrates as well as in the dielectric coatings. A possible method for minimizing thermal noise is cooling to cryogenic temperatures, maximizing the mechanical quality factor Q, and maximizing the eigenfrequencies of the substrate. We present experimental details of a new cryogenic apparatus that is suitable for the measurement of the temperature-dependent Q-factor of reflective, transmissive as well as nano-structured grating optics down to 5 K. In particular, the SQUID-based and the optical interferometric approaches to the measurement of the amplitude of vibrating test bodies are compared and the method of ring-down recording is described.

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Language(s): eng - English
 Dates: 2006-05
 Publication Status: Published in print
 Pages: -
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 Identifiers: eDoc: 298188
ISI: 000238405900028
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Title: ISEC 2005: The 10th International Superconductive Electronics Conference
Place of Event: Noordwijkerhiut, The Netherlands
Start-/End Date: 2005-09-05 - 2005-09-09

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Title: Superconductor Science and Technology
  Alternative Title : Supercond. Sci. Technol.
Source Genre: Journal
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Pages: - Volume / Issue: 19 (5) Sequence Number: - Start / End Page: S293 - S296 Identifier: ISSN: 0953-2048