Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 45: Precision Measurement and Metrology 2
Q 45.5: Talk
Thursday, March 17, 2011, 11:45–12:00, HÜL 386
The frequency reference cavity for the AEI 10m Prototype interferometer — •Fumiko Kawazoe1, Alessandro Bertolini1, Michael Born1, Yanbei Chen2, Katrin Dahl1, Stefan Gossler1, Christian Graef1, Gerhard Heinzel1, Stefan Hild3, Sabina Huttner3, Gerrit Kuehn1, Harald Lueck1, Kasem Mossavi1, Roman Schnabel1, Kentaro Somiya4, Kenneth A. Strain3, John R Taylor1, Alexander Wanner1, Tobias Westphal1, Benno Willke1, and Karsten Danzmann1 — 1Max-Planck-Institut fuer Gravitationsphysik, QUEST, and Leibniz Universitaet Hannover,30167 Hannover, Germany — 2California Institute of Technology, Pasadena, CA 91125 — 3University of Glasgow, Glasgow, G12 8QQ, UK — 4Waseda Institute for Advanced Study,1-6-1 Nishi Waseda, Shinjuku-ku, Tokyo 169-8050, Japan
The AEI 10m Prototype Interferometer will run an interferometric experiment called the sub-SQL interferometer whose sensitivity is designed to reach and even surpass the Standard Quantum Limit. In order to achieve such a good sensitivity, it is required that the laser frequency noise is suppressed to a level of 10−4 Hz/√Hz at 20 Hz dropping to below 10−6 Hz/√Hz at 1 kHz. For this purpose we have designed a ∼ 20 Hz round-trip optical cavity with each mirror individually suspended from a triple cascaded pendulum systems. By controlling the laser frequency to follow the reference cavity’s supporting frequency, we aim to achieve the required level of frequency stability. Here, details of the reference cavity design and the according control loop are presented.