Corbitt, Thomas and Wipf, Christopher and Bodiya, Timothy and Ottaway, David and Sigg, Daniel and Smith, Nicolas and Whitcomb, Stanley and Mavalvala, Nergis (2007) Optical Dilution and Feedback Cooling of a Gram-Scale Oscillator to 6.9 mK. Physical Review Letters, 99 (16). Art. No. 160801. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:CORprl07
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We report on the use of a radiation pressure induced restoring force, the optical spring effect, to optically dilute the mechanical damping of a 1 g suspended mirror, which is then cooled by active feedback (cold damping). Optical dilution relaxes the limit on cooling imposed by mechanical losses, allowing the oscillator mode to reach a minimum temperature of 6.9 mK, a factor of ~40 000 below the environmental temperature. A further advantage of the optical spring effect is that it can increase the number of oscillations before decoherence by several orders of magnitude. In the present experiment we infer an increase in the dynamical lifetime of the state by a factor of ~200.
|Additional Information:||©2007 The American Physical Society. (Received 8 May 2007; published 18 October 2007) We would like to thank our colleagues at the LIGO Laboratory, especially Rolf Bork and Jay Heefner, and the MQM group for invaluable discussions. We gratefully acknowledge support from National Science Foundation Grants No. PHY-0107417 and No. PHY-0457264.|
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|Deposited On:||20 Oct 2007|
|Last Modified:||26 Dec 2012 09:44|
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