Enhanced characteristics of fused silica fibers using laser polishing

Heptonstall, A. et al. (2014) Enhanced characteristics of fused silica fibers using laser polishing. Classical and Quantum Gravity, 31(10), p. 105006. (doi: 10.1088/0264-9381/31/10/105006)

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Publisher's URL: http://dx.doi.org/10.1088/0264-9381/31/10/105006


The search for gravitational wave signals from astrophysical sources has led to the current work to upgrade the two largest of the long-baseline laser interferometers, the LIGO detectors. The first fused silica mirror suspensions for the Advanced LIGO gravitational wave detectors have been installed at the LIGO Hanford and Livingston sites. These quadruple pendulums use synthetic fused silica fibers produced using a CO<sub>2</sub> laser pulling machine to reduce thermal noise in the final suspension stage. The suspension thermal noise in Advanced LIGO is predicted to be limited by internal damping in the surface layer of the fibers, damping in the weld regions, and the strength of the fibers. We present here a new method for increasing the fracture strength of fused silica fibers by laser polishing of the stock material from which they are produced. We also show measurements of mechanical loss in laser polished fibers, showing a reduction of 30% in internal damping in the surface layer.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Grant, Mr Alastair and Heptonstall, Dr Alastair and Bell, Dr Angus and Hammond, Professor Giles and Tokmakov, Dr Kirill and Robertson, Mr Neil and Cagnoli, Dr Gianpietro and Rowan, Professor Sheila and Kumar, Mr Rahul and Martin, Dr Iain and Cumming, Dr Alan and Hough, Professor James and Strain, Professor Kenneth and Jones, Mr Russell and Barton, Dr Mark
Authors: Heptonstall, A., Barton, M. A., Bell, A. S., Bohn, A., Cagnoli, G., Cumming, A., Grant, A., Gustafson, E., Hammond, G. D., Hough, J., Jones, R., Kumar, R., Lee, K., Martin, I. W., Robertson, N. A., Rowan, S., Strain, K. A., and Tokmakov, K. V.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Classical and Quantum Gravity
Publisher:IOP Publishing
ISSN (Online):1361-6382
Copyright Holders:Copyright © 2014 The Authors
First Published:First published in Classical and Quantum Gravity 31(10):105006
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
459313Investigations in Gravitational Radiation.Sheila RowanScience & Technologies Facilities Council (STFC)ST/J000361/1P&A - PHYSICS & ASTRONOMY