Optical Dilution and Feedback Cooling of a Gram-Scale Oscillator to 6.9 mK
T. R. CorbittLIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAChristopher WipfLIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAT. P. BodiyaLIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAD. J. OttawayLIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAD. SiggNicolas de Mateo SmithLIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USAStanley WhitcombLIGO Laboratory, California Institute of Technology, Pasadena, California 91125, USAN. MavalvalaLIGO Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2007en
ABI
Abstract
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 approximately 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 approximately 200.
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