Heinert, D., Craig, K., Grote, H., Hild, S., Lück, H., Nawrodt, R., Simakov, D.A., Vasilyev, D.V., Vyatchanin, S. P. and Wittel, H. (2014) Thermal noise of folding mirrors. Physical Review D, 90(4), 042001. (doi: 10.1103/PhysRevD.90.042001)
|
Text
94871.pdf - Published Version Available under License Creative Commons Attribution. 910kB |
Publisher's URL: http://dx.doi.org/10.1103/PhysRevD.90.042001
Abstract
Current gravitational wave detectors rely on the use of Michelson interferometers. One crucial limitation of their sensitivity is the thermal noise of their optical components. Thus, for example fluctuational deformations of the mirror surface are probed by a laser beam being reflected from the mirrors at normal incidence. Thermal noise models are well evolved for that case but mainly restricted to single reflections. In this work we present the effect of two consecutive reflections under a non-normal incidence onto mirror thermal noise. This situation is inherent to detectors using a geometrical folding scheme such as GEO\,600. We revise in detail the conventional direct noise analysis scheme to the situation of non-normal incidence allowing for a modified weighting funtion of mirror fluctuations. An application of these results to the GEO\,600 folding mirror for Brownian, thermoelastic and thermorefractive noise yields an increase of displacement noise amplitude by 20\% for most noise processes. The amplitude of thermoelastic substrate noise is increased by a factor 4 due to the modified weighting function. Thus the consideration of the correct weighting scheme can drastically alter the noise predictions and demands special care in any thermal noise design process.
Item Type: | Articles |
---|---|
Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Nawrodt, Dr Ronny and Hild, Professor Stefan and Craig, Mr Kieran |
Authors: | Heinert, D., Craig, K., Grote, H., Hild, S., Lück, H., Nawrodt, R., Simakov, D.A., Vasilyev, D.V., Vyatchanin, S. P., and Wittel, H. |
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: | Physical Review D |
Publisher: | American Physical Society |
ISSN: | 1550-7998 |
ISSN (Online): | 1550-2368 |
Copyright Holders: | Copyright © 2014 American Physical Society |
First Published: | First published in Physical Review D 90(4):042001 |
Publisher Policy: | Reproduced under a Creative Commons License |
University Staff: Request a correction | Enlighten Editors: Update this record