Heptonstall, A. et al. (2010) Investigation of mechanical dissipation in CO2 laser-drawn fused silica fibres and welds. Classical and Quantum Gravity, 27(3), 035013. (doi: 10.1088/0264-9381/27/3/035013)
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Abstract
The planned upgrades to the LIGO gravitational wave detectors include monolithic mirror suspensions to reduce thermal noise. The mirrors will be suspended using CO<sub>2</sub> laser-drawn fused silica fibres. We present here measurements of mechanical dissipation in synthetic fused silica fibres drawn using a CO<sub>2</sub> laser. The level of dissipation in the surface layer is investigated and is found to be at a similar level to fibres produced using a gas flame. Also presented is a method for examining dissipation at welded interfaces, showing clear evidence of the existence of this loss mechanism which forms an additional component of the total detector thermal noise. Modelling of a typical detector suspension configuration shows that the thermal noise contribution from this loss source will be negligible.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Torrie, Dr Calum and Cantley, Dr Caroline and Rowan, Professor Sheila and Kumar, Mr Rahul and Martin, Dr Iain and Cumming, Dr Alan and Hough, Professor James and Jones, Mr Russell |
| Authors: | Heptonstall, A., Barton, M., Cantley, C., Cumming, A., Cagnoli, G., Hough, J., Jones, R., Kumar, R., Martin, I., Rowan, S., Torrie, C., and Zech, S. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Research Centre: | College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research |
| Journal Name: | Classical and Quantum Gravity |
| Publisher: | Institute of Physics |
| ISSN: | 0264-9381 |
| ISSN (Online): | 1361-6382 |
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