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

Research output: Contribution to journalArticle

5 Citations (Scopus)


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 languageEnglish
Pages (from-to)1938-
JournalApplied Optics
Issue number9
Publication statusPublished - 1 Jan 2004


Dive into the research topics of 'Automatic Beam Alignment for the Mode-Cleaner Cavities of GEO 600'. Together they form a unique fingerprint.

Cite this