Automatic beam alignment for the mode-cleaner cavities of GEO 600

Grote, H. et al. (2004) Automatic beam alignment for the mode-cleaner cavities of GEO 600. Applied Optics, 43(9), pp. 1938-1945.

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Publisher's URL: http://ao.osa.org/abstract.cfm?id=79239

Abstract

The automatic alignment system for the two suspended, triangular mode-cleaner cavities of the gravitational wave detector GEO 600 has been in continuous operation since the spring of 2001. A total of 20 angular degrees of freedom are controlled by feedback loops with almost no manual alignment having been required since installation. Error signals for the eight most important degrees of freedom are obtained with the differential wave-front sensing technique. We describe the sensing system, the control topology, and the performance of the automatic alignment system. A continuous locking stretch of more than 120 h has been achieved.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Casey, Dr Morag and Hough, Professor James and Robertson, Dr David and Ward, Professor Henry and Strain, Professor Kenneth
Authors: Grote, H., Heinzel, G., Freise, A., Gossler, S., Willke, B., Luck, H., Ward, H., Casey, M.M., Strain, K.A., Robertson, D., Hough, J., and Danzmann, K.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Applied Optics
ISSN:0003-6935

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