Application of new pre-isolation techniques to mode cleaner design

Pablo Barriga, Andrew Woolley, C. Zhao, David Blair, Carlo Bradaschia (Editor)

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)


    Two very low frequency pre-isolation stages can greatly reduce the residual motion of suspended optical components. In a mode cleaner this can reduce the control forces required on the mirrors, simplifying lock acquisition and reducing noise injection through control forces. This paper describes a 12 m triangular suspended mode cleaner under construction for the AIGO high optical power interferometer. A novel and very compact multistage isolator supports the cavity mirrors. It combines an inverse pendulum in series with a low-mass Roberts linkage, both with pendulum frequencies below 0.1 Hz. The suspension chain is. connected to the Roberts linkage via a Euler spring stage and a cantilever spring assembly for vertical isolation. We present an analysis of the mode cleaner, emphasizing the advantage of the improved mode-cleaner suspension and its power-handling capability. The effect of seismic noise on the residual velocity of the mirrors and the predicted frequency stability of the optical cavity are presented.
    Original languageEnglish
    Pages (from-to)S951-S958
    JournalClassical and Quantum Gravity
    Issue number5
    Publication statusPublished - 2004


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