Automatic Beam Alignment for the Mode-Cleaner Cavities of GEO 600

H Grote; G Heinzel; Andreas Freise; S Go�ler; B Willke; H L�ck; H Ward; MM Casey; KA Strain; D Robertson; J Hough; K Danzmann

doi:10.1364/AO.43.001938

Automatic Beam Alignment for the Mode-Cleaner Cavities of GEO 600

H Grote, G Heinzel, Andreas Freise, S Go�ler, B Willke, H L�ck, H Ward, MM Casey, KA Strain, D Robertson, J Hough, K Danzmann

Physics and Astronomy

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5 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1938-
Journal	Applied Optics
Volume	43
Issue number	9
DOIs	https://doi.org/10.1364/AO.43.001938
Publication status	Published - 1 Jan 2004

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AU - Grote, H

AU - Heinzel, G

AU - Freise, Andreas

AU - Go�ler, S

AU - Willke, B

AU - L�ck, H

AU - Ward, H

AU - Casey, MM

AU - Strain, KA

AU - Robertson, D

AU - Hough, J

AU - Danzmann, K

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AB - 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.

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JF - Applied Optics

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Automatic Beam Alignment for the Mode-Cleaner Cavities of GEO 600

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