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ID: 298188.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
Cryogenic Q-factor measurement of optical substrates for optimization of gravitational wave detectors
Authors:Nietzsche, S.; Nawrodt, Ronny; Zimmer, A.; Schnabel, Roman; Vodel, W.; Seidel, Paul
Date of Publication (YYYY-MM-DD):2006-05
Title of Journal:Superconductor Science and Technology
Journal Abbrev.:Supercond. Sci. Technol.
Volume (in Journal):19
Issue / Number:5
Start Page:S293
End Page:S296
Name of Conference/Meeting:ISEC 2005: The 10th International Superconductive Electronics Conference
Place of Conference/Meeting:Noordwijkerhiut, The Netherlands
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:Peer-review
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
MPI für Gravitationsphysik/Teilinstitut Hannover
External Affiliations:Univ Jena, Inst Festkorperphys, D-07743 Jena, Germany.; Univ Hannover, Max Planck Inst Gravitationsphys, D-30167 Hannover, Germany.
Identifiers:ISI:000238405900028 [ID No:1]
ISSN:0953-2048 [ID No:2]
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