Sensitivity characterisation of a parametric transducer for gravitational wave detection through optical spring effect

N. C. Carvalho, J. Bourhill, M. E. Tobar, O. D. Aguiar

    Research output: Contribution to journalArticle

    Abstract

    We present the characterisation of the most recent parametric transducers designed to enhance the Mario Schenberg gravitational wave detector sensitivity. The transducer is composed of a microwave re-entrant cavity that attaches to the gravitational wave antenna via a rigid spring. It functions as a three-mode mass-spring system; motion of the spherical antenna couples to a 50 μm thick membrane, which converts its mechanical motion into a frequency shift of the cavity resonance. Through the optical spring effect, the microwave transducer frequency-displacement sensitivity was measured to be 726 MHz μm-1 at 4 K. The spherical antenna detection sensitivity is determined analytically using the transducer amplification gain and equivalent displacement noise in the test setup, which are 5.5 × 1011 V m-1 and 1.8 × 1019 m √Hz-1, respectively.

    Original languageEnglish
    Article number175001
    JournalClassical and Quantum Gravity
    Volume34
    Issue number17
    DOIs
    Publication statusPublished - 28 Jul 2017

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