Commissioning of the tuned DC readout at GEO 600

J. Degallaix*, H. Grote, M. Prijatelj, M. Hewitson, S. Hild, C. Affeldt, A. Freise, J. Leong, H. Luck, K.A. Strain, H. Wittel, B. Willke, K. Danzmann

*Corresponding author for this work

Research output: Contribution to journalConference article in journalAcademicpeer-review


Recent experimental results from GEO 600 operating with a DC readout and a tuned signal recycling cavity are reported. Compared to the S5/Astrowatch setup, two major changes in the configuration have been implemented: the control readout to keep the interferometer on the dark fringe is changed from heterodyne to homodyne readout and the signal recycling cavity is shifted from a 550Hz detuning to a 0 Hz detuning (also called tuned). As preliminary experiments showed,the tuned DC readout sensitivity is similar to the heterodyneone. To take advantage of the new DC readout detection scheme, an Output Mode Cleaner (OMC) has to be installed. The design, building and testing of the GEO OMC, which consists of a 4 mirrors monolithic ring cavity, will also be presented in this article.
Original languageEnglish
Article number012013
Pages (from-to)1-8
Number of pages8
JournalJournal of Physics: Conference Series
Publication statusPublished - 1 Jan 2010
Externally publishedYes


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