NOISE PERFORMANCE OF A 72 m SUSPENDED FABRY-PEROT CAVITY

J.C. Dumas, Li Ju, Pablo Barriga, C.N. Zhao, A.A. Woolley, David Blair

    Research output: Chapter in Book/Conference paperOther chapter contribution

    Abstract

    We report on a seismic isolator with a relatively compact 3 m stack, combining new passive isolation techniques. It consists of three cascaded passive 3D isolator stages suspended from an Ultra Low Frequency (ULF) horizontal Robert linkage stage which itself is suspended from a ULF 3D pre-isolator. The 3D isolators use self-damping pendulums and Euler springs for the horizontal and vertical stages respectively, while the 3D pre-isolator is the combination of an inverse pendulum which provides low frequency horizontal pre-isolation, and a LaCoste linkage for low frequency vertical pre-isolation. Two isolators suspending mirror test masses have been built to form a 72 m optical cavity in order to test their performance. We report results which demonstrate residual motion at nanometer level at frequencies above 1 Hz.
    Original languageEnglish
    Title of host publicationINTERNATIONAL JOURNAL OF MODERN PHYSICS D
    Place of PublicationSINGAPORE
    Pages2063-2067
    DOIs
    Publication statusPublished - 2011

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