Bruit thermique et effets de la pression de radiation dans une cavité optique de grande finesse

Abstract : We study how a cavity with a movable mirror can be used to measure very small displacements The use of a high-finesse optical cavity allows to observe the thermal noise of the mirrors. which is an important limitation to high-sensitivity measurements. The mirror can also move under the influence of the quantum fluctuations of radiation pressure, which leads to a Standard Quantum Limit for a position measurement. We present the results of our experiment in which a laser beam beam is sent into a single-port cavity with the back mirror coated on a mechanical resonator. We observed the Brownian motion of the mirror with a very high sensitivity (2.75 x 10^-19 m/√Hz ). We also studied the possibility of cooling the mirror using the radiation pressure of a second intensity-modulated beam. Close to the mechanical resonance. we apply an additional viscous force without any additional noise (cold damping). We have observed a reduction of the thermal noise, both at the mechanical resonance frequency and at low frequency. A potential application of such a cooling process to gravitational interferometers is discussed.
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Pierre-François Cohadon. Bruit thermique et effets de la pression de radiation dans une cavité optique de grande finesse. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2000. Français. ⟨tel-00011772⟩

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