Feedback cooling of a cantilever's fundamental mode below 5 mK

Details Feedback cooling of a cantilever's fundamental mode below 5 mK Feedback cooling of a cantilever's fundamental mode below 5 mK

2007-02-20

arxiv.org/abs/cond-mat/0702446v1

Phys. Rev. Lett. 99, 017201 (2007)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.99.017201

We cool the fundamental mechanical mode of an ultrasoft silicon cantilever from a base temperature of 2.2 K to 2.9 +/- 0.3 mK using active optomechanical feedback. The lowest observed mode temperature is consistent with limits determined by the properties of the cantilever and by the measurement noise. For high feedback gain, the driven cantilever motion is found to suppress or "squash" the optical interferometer intensity noise below the shot noise level.

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