Wide-Band Direct Measurement of Thermal Fluctuations in an Interferometer

Details Wide-Band Direct Measurement of Thermal Fluctuations in an Interferometer Wide-Band Direct Measurement of Thermal Fluctuations in an Interferometer

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phrvl..91z0602n&link_type=abstract

Physical Review Letters, vol. 91, Issue 26, id. 260602

Physics

26

Brownian Motion, Gravitational Wave Detectors And Experiments, Interferometers

Scientific paper

We directly measured mechanical thermal fluctuations in mirrors over three decades of frequency range using a short-length Fabry-Perot interferometer. This is the first such measurement at wide off-resonant frequency band that is much lower than mechanical resonant frequencies. Theoretically, the mechanical fluctuation in mirrors had been thought to become the principal noise in precise interferometry, such as in gravitational wave detection. We identified the thermally induced noises in the interferometer, the so-called substrate Brownian noise, substrate thermoelastic noise, and coating Brownian noise.

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