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Optical Dilution and Feedback Cooling of a Gram-Scale Oscillator to 6.9 mK

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. doi:10.1103/PhysRevLett.99.160801.

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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.

Item Type:Article
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Corbitt, Thomas0000-0002-5520-8541
Ottaway, David0000-0001-6794-1591
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.
Issue or Number:16
Record Number:CaltechAUTHORS:CORprl07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9013
Deposited By: Archive Administrator
Deposited On:20 Oct 2007
Last Modified:08 Nov 2021 20:55

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