“Negative” Backaction Noise in Interferometric Detection of a Microlever

J. Laurent, A. Mosset, O. Arcizet, J. Chevrier, S. Huant, and H. Sellier
Phys. Rev. Lett. 107, 050801 – Published 28 July 2011

Abstract

Interferometric detection of mirror displacements is intrinsically limited by laser shot noise. In practice, however, it is often limited by thermal noise. Here we report on an experiment performed at the liquid helium temperature to overcome the thermal noise limitation and investigate the effect of classical laser noise on a microlever that forms a Fabry-Perot cavity with an optical fiber. The spectral noise densities show a region of “negative” contribution of the backaction noise close to the resonance frequency. We interpret this noise reduction as a coherent coupling of the microlever to the laser intensity noise. This optomechanical effect could be used to improve the detection sensitivity as discussed in proposals going beyond the standard quantum limit.

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  • Received 14 March 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.050801

© 2011 American Physical Society

Authors & Affiliations

J. Laurent, A. Mosset, O. Arcizet, J. Chevrier, S. Huant, and H. Sellier

  • Institut Néel, CNRS et Université Joseph Fourier, B.P. 166, F-38042 Grenoble Cedex 9, France

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Issue

Vol. 107, Iss. 5 — 29 July 2011

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