Proposed cryogenic Q-factor measurement of mirror substrates

Details Proposed cryogenic Q-factor measurement of mirror substrates Proposed cryogenic Q-factor measurement of mirror substrates

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cqgra..21s1133n&link_type=abstract

Classical and Quantum Gravity, Volume 21, Issue 5, pp. S1133-S1138 (2004).

Computer Science

2

Scientific paper

The thermal noise of optical components (e.g., end mirrors, beam splitters) is one of the limiting factors of the sensitivity of most of the present interferometric gravitational wave detectors, and it will be limiting in the advanced detectors now being designed. This thermal noise occurs mainly in the optical substrates and their mirror coatings. One possible method for minimizing thermal noise is cooling to cryogenic temperatures, maximizing the mechanical Q and maximizing the eigenfrequencies of the substrate. A new cryogenic apparatus for investigations of the temperature dependency of the Q-factor of several substrate materials down to 4.2 K is proposed. Possible methods of mode excitation and ring down measurement are discussed.

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