- Conference date: 4-9 June 2000
- Location: Florence, Itlay
Sensitivity in gravitational-wave interferometers is limited by the Brownian motion of the mirrors. This thermal noise is a consequence of the energy of the mirror at thermal equilibrium and it induces small displacements and deformations of the mirror surface. This noise can be studied experimentally with a high-finesse optical cavity since the phase of the reflected field is very sensitive to changes of the cavity length. We have observed the Brownian motion of a mirror and we have cooled the mirror by the radiation pressure of light. Such an active control of the thermal noise may be useful to increase the sensitivity of gravitational-wave detectors.
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