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

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

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cqgra..21s1139y&link_type=abstract

Classical and Quantum Gravity, Volume 21, Issue 5, pp. S1139-S1144 (2004).

Physics

3

Scientific paper

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-uniform scattering within two 4.5 kg sapphire test masses manufactured by the heat exchanger method.

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