Self-cooling of a micro-mirror by radiation pressure

Details Self-cooling of a micro-mirror by radiation pressure Self-cooling of a micro-mirror by radiation pressure

2006-07-11

arxiv.org/abs/quant-ph/0607068v2

Nature 444, 67 - 70 (02 Nov 2006)

Physics

Quantum Physics

11 pages, 9 figures, minor corrections

Scientific paper

10.1038/nature05273

We demonstrate passive feedback cooling of a mechanical resonator based on radiation pressure forces and assisted by photothermal forces in a high-finesse optical cavity. The resonator is a free-standing high-reflectance micro-mirror (of mass m=400ng and mechanical quality factor Q=10^4) that is used as back-mirror in a detuned Fabry-Perot cavity of optical finesse F=500. We observe an increased damping in the dynamics of the mechanical oscillator by a factor of 30 and a corresponding cooling of the oscillator modes below 10 K starting from room temperature. This effect is an important ingredient for recently proposed schemes to prepare quantum entanglement of macroscopic mechanical oscillators.

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