Extending a release-and-recapture scheme to single atom optical tweezer for effective temperature evaluation

doi:10.1088/1674-1056/20/7/073701

Abstract By recording the fluorescence fraction of the cold atoms remaining in the magneto-optical trap (MOT) as a function of the release time, the release-and-recapture (R&R) method is utilized to evaluate the effective temperature of the cold atomic ensemble. We prepare a single atom in a large-magnetic-gradient MOT and then transfer the trapped single atom into a 1064-nm microscopic optical tweezer. The energy of the single atom trapped in the tweezer is further reduced by polarization gradient cooling (PGC) and the effective temperature is evaluated by extending the R&R technique to a single atom tweezer. The typical effective temperature of a single atom in the tweezer is improved from about 105 μK to about 17 μK by applying the optimum PGC phase.

Keywords: single atom optical tweezer effective temperature release-and-recapture technique

Received: 08 December 2010
Revised: 22 February 2011
Accepted manuscript online:

PACS:	37.10.De	(Atom cooling methods)
	37.10.Gh	(Atom traps and guides)
	87.80.Cc	(Optical trapping)
	42.50.-p	(Quantum optics)

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He Jun(何军), Yang Bao-Dong(杨保东), Zhang Tian-Cai(张天才), and Wang Jun-Min(王军民) Extending a release-and-recapture scheme to single atom optical tweezer for effective temperature evaluation 2011 Chin. Phys. B 20 073701

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Extending a release-and-recapture scheme to single atom optical tweezer for effective temperature evaluation

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