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Proceedings Paper

Low mechanical loss coatings for LIGO optics: progress report
Author(s): Roger P. Netterfield; Mark Gross; Fred N. Baynes; Katie L. Green; Gregory M. Harry; Helena Armandula; Sheila Rowan; Jim Hough; David R. M. Crooks; Martin M. Fejer; Roger Route; Steven D. Penn
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Paper Abstract

A significant limiting factor on the sensitivity of interferometric gravitational wave detectors has been identified as thermal noise generated by mechanical loss in the high reflectivity dielectric mirror coatings on the test masses. The development of coatings which maintain high optical performance and minimize mechanical loss is therefore vital if the current designs of interferometers are to achieve adequate sensitivity. While the origins of the mechanical loss are yet to be fully elucidated, some progress has been made toward minimizing it, although there is still some way to go before specifications can be met. The work reported here is progress made toward achieving low mechanical loss coatings on behalf of the LIGO consortium. The current directions include attempts to reduce the loss in the coating materials by control of the coating stoichiometry and intrinsic stress. This includes such methods as ion bombardment of the growing films and optimization of post-deposition thermal treatments.

Paper Details

Date Published: 20 August 2005
PDF: 9 pages
Proc. SPIE 5870, Advances in Thin-Film Coatings for Optical Applications II, 58700H (20 August 2005); doi: 10.1117/12.618288
Show Author Affiliations
Roger P. Netterfield, Commonwealth Scientific and Industrial Research Organisation (Australia)
Mark Gross, Commonwealth Scientific and Industrial Research Organisation (Australia)
Fred N. Baynes, Commonwealth Scientific and Industrial Research Organisation (Australia)
Katie L. Green, Commonwealth Scientific and Industrial Research Organisation (Australia)
Gregory M. Harry, LIGO Lab., Massachusetts Institute of Technology (United States)
Helena Armandula, LIGO Lab., California Institute of Technology (United States)
Sheila Rowan, Univ. of Glasgow (United Kingdom)
Jim Hough, Univ. of Glasgow (United Kingdom)
David R. M. Crooks, Univ. of Glasgow (United Kingdom)
Martin M. Fejer, Stanford Univ. (United States)
Roger Route, Stanford Univ. (United States)
Steven D. Penn, Hobart and William Smith Colleges (United States)


Published in SPIE Proceedings Vol. 5870:
Advances in Thin-Film Coatings for Optical Applications II
Michael L. Fulton; Jennifer D. T. Kruschwitz, Editor(s)

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