A cold 87Rb atomic beam

doi:10.1088/1674-1056/20/12/126701

Abstract We demonstrate an experimental setup for the production of a beam source of cold ⁸⁷Rb atoms. The atoms are extracted from a trapped cold atomic cloud in an unbalanced three-dimensional magneto-optical trap. Via a radiation pressure difference generated by a specially designed leak tunnel along one trapping laser beam, the atoms are pushed out continuously with low velocities and a high flux. The most-probable velocity in the beam is varied from 9 m/s to 19 m/s by varying the detuning of the trapping laser beams in the magneto-optical trap and the flux can be tuned up to 4×10⁹ s^-1 by increasing the intensity of the trapping beams. We also present a simple model for describing the dependence of the beam performance on the magneto-optical trap trapping laser intensity and the detuning.

Keywords: continuous atomic beam unbalanced three-dimensional magneto-optical trap radiation pressure difference laser cooling and trapping

Received: 29 June 2011
Revised: 24 September 2011
Accepted manuscript online:

PACS:

67.85.-d

(Ultracold gases, trapped gases)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50775127), the Major State Basic Research Development Program of China (Grant No. 2010CB922901), and the Independent Research Projects of Tsinghua University, China (Grant No. 2009THZ06).

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Wang Xiao-Jia(王晓佳), Feng Yan-Ying(冯焱颖), Xue Hong-Bo(薛洪波), Zhou Zhao-Ying(周兆英), and Zhang Wen-Dong(张文栋) A cold ⁸⁷Rb atomic beam 2011 Chin. Phys. B 20 126701

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A cold 87Rb atomic beam

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A cold ⁸⁷Rb atomic beam