Towards measuring the off-resonant thermal noise of a pendulum mirror

Details Towards measuring the off-resonant thermal noise of a pendulum mirror Towards measuring the off-resonant thermal noise of a pendulum mirror

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cqgra..19.1717l&link_type=abstract

Classical and Quantum Gravity, Volume 19, Issue 7, pp. 1717-1721 (2002).

Physics

4

Scientific paper

Thermal noise is one of the dominant noise sources in interferometric length measurements and can limit the sensitivity of gravitational wave detectors. Our goal is to analyse the off-resonant thermal noise of a high Q pendulum. Therefore we interferometrically detect the length changes of a 2.3 cm long optical resonator, which for good seismic isolation consists of two multiple stage pendulums. We are able to lock the length of this optical resonator to a frequency-stabilized laser beam and as a result get the spectral density of the differential mirror movement.

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