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Interferometric detection of mirror displacements is intrinsically limited bylaser shot noise. In practice, however, it is often limited by thermal noise.Here we report on an experiment performed at the liquid helium temperature toovercome the thermal noise limitation and investigate the effect of classicallaser noise on a microlever that forms a Fabry-Perot cavity with an opticalfiber. The spectral noise densities show a region of negative contribution ofthe backaction noise close to the resonance frequency. We interpret this noisereduction as a coherent coupling of the microlever to the laser intensitynoise. This optomechanical effect could be used to improve the detectionsensitivity as discussed in proposals going beyond the Standard Quantum Limit.

Negative Backaction Noise in Interferometric Detection of a Microlever