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Chin. Phys. B, 2011, Vol. 20(12): 126701    DOI: 10.1088/1674-1056/20/12/126701
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

A cold 87Rb atomic beam

Wang Xiao-Jia(王晓佳)a)b), Feng Yan-Ying(冯焱颖) b)c)†, Xue Hong-Bo(薛洪波)b), Zhou Zhao-Ying(周兆英)b), and Zhang Wen-Dong(张文栋)a)
a Key Laboratory of Instrumentation Science and Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China; b State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China; c Joint Institute of Measurement Science (JMI), National Institute of Metrologia–Tsinghua University, Beijing 100084, China
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).

Cite this article: 

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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