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  Mechanical Q-factor measurements on a test mass with a structured surface

Nawrodt, R., Zimmer, A., Koettig, T., Clausnitzer, T., Bunkowski, A., Kley, E.-B., et al. (2007). Mechanical Q-factor measurements on a test mass with a structured surface. New Journal of Physics, 9: 225. doi:10.1088/1367-2630/9/7/225.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-49B4-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-49B5-D
Genre: Journal Article

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 Creators:
Nawrodt, Ronny, Author
Zimmer, A., Author
Koettig, Torsten, Author
Clausnitzer, Tina, Author
Bunkowski, Alexander1, 2, Author
Kley, Ernst-Bernhard, Author
Schnabel, Roman1, Author              
Danzmann, Karsten1, Author              
Vodel, W., Author
Tünnermann, Andreas1, 2, Author
Seidel, Paul, Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24010              
2AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24009              

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 Abstract: We present mechanical Q-factors (quality factors) of a crystalline quartz test mass with a nano-structured surface, measured in the temperature regime from 5 to 300 K. The nano-structure was a grating with a period of 2 μm and a depth of about 0.1 μm. Comparative measurements were performed on the plain substrate and on the structured test mass with different numbers of SiO2/Ta2O5 coating layers. The measurements at different stages of the test mass fabrication process show that the surface distortion induced by the nanostructure does not severely lower the mechanical Q-factor of the substrate. Damping due to a multi-layer coating stack was found to be orders of magnitude higher. The results provide vital information concerning the potential usage of low-thermal noise nano-structured test masses in future generations of high-precision laser interferometers and in current attempts to measure quantum effects of macroscopic mirror oscillators.

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 Dates: 2007
 Publication Status: Published in print
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 Identifiers: eDoc: 318080
DOI: 10.1088/1367-2630/9/7/225
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Title: New Journal of Physics
Source Genre: Journal
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Pages: - Volume / Issue: 9 Sequence Number: 225 Start / End Page: - Identifier: -