Journal
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume 27, Issue 5, Pages 914-919Publisher
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.27.000914
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Funding
- European Community [217257]
- European Space Agency (ESA)
- Deutsches Zentrum fur Luft- und Raumfahrt (DLR)
- Bundesministerium fur Wirtschaft und Technologie
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We investigate the thermal expansion of low thermal noise Fabry-Perot cavities made of low thermal expansion (LTE) glass spacers and fused silica (FS) mirrors. The different thermal expansion of mirror and spacer deforms the mirror. This deformation strongly contributes to the cavity's effective coefficient of thermal expansion (CTE), decreasing the zero crossing temperature by about 20 K compared to an all-LTE glass cavity. Finite element simulations and CTE measurements show that LTE rings optically contacted to the back surface of the FS mirrors allow to tune the zero crossing temperature over a range of 30 K. (C) 2010 Optical Society of America
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