Investigation of mechanical dissipation in CO2 laser-drawn fused silica fibres and welds

Details Investigation of mechanical dissipation in CO2 laser-drawn fused silica fibres and welds Investigation of mechanical dissipation in CO2 laser-drawn fused silica fibres and welds

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010cqgra..27c5013h&link_type=abstract

Classical and Quantum Gravity, Volume 27, Issue 3, pp. 035013 (2010).

Computer Science

2

Scientific paper

The planned upgrades to the LIGO gravitational wave detectors include monolithic mirror suspensions to reduce thermal noise. The mirrors will be suspended using CO2 laser-drawn fused silica fibres. We present here measurements of mechanical dissipation in synthetic fused silica fibres drawn using a CO2 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.

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