Phys. Rev. Lett. 99, 017201 (2007) [4 pages]Feedback Cooling of a Cantilever’s Fundamental Mode below 5 mKReceived 7 February 2007; published 2 July 2007 We cool the fundamental mechanical mode of an ultrasoft silicon cantilever from a base temperature of 2.2 K down 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.017201
DOI:
10.1103/PhysRevLett.99.017201
PACS:
85.85.+j, 42.50.Lc, 45.80.+r, 46.40.−f
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