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A study of coating mechanical and optical losses in view of reducing mirror thermal noise in gravitational wave detectors
Flaminio R., Franc J., Michel C., Morgado N., Pinard L. et al
Dans Classical and Quantum Gravity - The 8th Edoardo Amaldi Conference on Gravitational Waves (Amaldi 8), New-York : (2009) - http://hal.in2p3.fr/in2p3-00567980
Physique/Physique/Instrumentations et Détecteurs
A study of coating mechanical and optical losses in view of reducing mirror thermal noise in gravitational wave detectors
R. Flaminio1, J. Franc1, C. Michel1, N. Morgado1, L. Pinard1, B. Sassolas1
1 :  LMA - Laboratoire des matériaux avancés
CNRS : USR3264 – IN2P3 – Université Claude Bernard - Lyon I (UCBL)
Bâtiment 213 VIRGO 22 7 avenue Pierre de Coubertin 69622 VILLEURBANNE CEDEX
France
Mirror coatings play a crucial role in the performance of laser interferometers devoted to gravitational wave detection such as Virgo and LIGO. Mechanical losses in the coating material limit the sensitivity of the detectors due to the associated mirror thermal noise. The absorption of light in the coating induces a thermal lens in the mirror substrate which reduces the quality of the optical interference and requires sophisticated thermal compensation systems. This paper describes the work ongoing at LMA in order to reduce mechanical losses and optical absorption in the coating. The results obtained by doping Ta2O5 layers and testing different high-index materials are described. Finally the performances of different potential coatings are compared and the results obtained with a 40 kg mirror are reported. Titania doped Ta2O5 shows mechanical losses of 2 × 10−4 and absorption below 0.5 ppm. Nb2O5 appears to be the best competitor from the thermal noise point of view but it has an optical absorption four to five times larger.

Communications avec actes
2010
2009
Classical and Quantum Gravity
internationale
27
0840030

The 8th Edoardo Amaldi Conference on Gravitational Waves (Amaldi 8)
New-York
22/06/2009
26/06/2009