Approaching the quantum limit with optically instrumented multimode gravitational-wave bar detectors

Astronomy and Astrophysics – Astrophysics

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Velocity, Acceleration, And Rotation, Optical Instruments And Equipment

Scientific paper

A laser-illuminated Fabry-Perot cavity with a finesse of 83000 and power dissipation of a few μW is tested at room temperature. The sensitivity to changes in the length of the cavity is 5.6×10-17 m/√Hz . The sensitivity of multimode gravitational-wave bar detectors operated between 0.03 and 4.2 K and instrumented with a Fabry-Perot transducer of similar characteristics is calculated. The sensitivity projected for a three-mode 2400-kg Al 5056 antenna operating at 800 Hz and cooled to 0.03 K is δh=6.8×10-21 and the noise temperature of the system is a factor of 16 above the standard quantum limit. Such a sensitivity would permit observations of astrophysical significance.

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