Large-scale inhomogeneity in sapphire test masses revealed by Rayleigh scattering imaging

Z. Yan, Li Ju, F. Eon, Slawomir Gras, C. Zhao, J.S. Jacob, David Blair, Carlo Bradaschia (Editor)

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Rayleigh scattering in test masses can introduce noise and reduce the sensitivity of laser interferometric gravitational wave detectors. In this paper, we present laser Rayleigh scattering imaging as a technique to investigate sapphire test masses. The system provides three-dimensional Rayleigh scattering mapping of entire test masses and quantitative evaluation of the Rayleigh scattering coefficient. Rayleigh scattering mapping of two sapphire samples reveals point defects as well as inhomogeneous structures in the samples. We present results showing significant non-uniforin scattering within two 4.5 kg sapphire test masses manufactured by the heat exchanger method.
    Original languageEnglish
    Pages (from-to)S1139-S1144
    JournalClassical and Quantum Gravity
    Volume21
    Issue number5
    DOIs
    Publication statusPublished - 2004

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