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Couplage optomécanique, action en retour et limites quantiques dans les mesures optiques ultrasensibles

Abstract : We present a very sensitive optical measurement of small displacements of a mirror. Thanks to the use of a very high-finesse cavity, we have reached a sensitivity of 10-20 m.Hz-1/2 over a wide frequency band (several
hundreds of kilohertz).

Our setup allows us to study accurately the noise sources in an optical measurement and the resulting limits. We are particularly interested in the optomechanical coupling induced by the radiation pressure exerted by light on a movable mirror. The mirror can move in response to the quantum fluctuations of radiation pressure, leading to an additional position noise. This back-action of the measurement on the system is responsible for quantum limits in the measurement.

Among the improvements made on the experimental setup, we have injected two laser beams into the cavity in order to study the quantum effects of optomechanical coupling. We have demonstrated a cancellation of back-action noise in the measurement resulting from a destructive interference between the displacements of both mirrors of the cavity. We present the potential applications of this effect for the improvement of the sensitivity in optical measurements, especially in gravitational-wave detectors based on dual resonators.
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https://tel.archives-ouvertes.fr/tel-00164656
Contributor : Thomas Caniard <>
Submitted on : Monday, July 23, 2007 - 10:38:57 AM
Last modification on : Thursday, December 10, 2020 - 12:38:43 PM
Long-term archiving on: : Thursday, April 8, 2010 - 7:33:18 PM

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  • HAL Id : tel-00164656, version 1

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Thomas Caniard. Couplage optomécanique, action en retour et limites quantiques dans les mesures optiques ultrasensibles. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2007. Français. ⟨tel-00164656⟩

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