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Science 12 March 1999:
Vol. 283. no. 5408, pp. 1706 - 1709
DOI: 10.1126/science.283.5408.1706
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Reports

A Well-Collimated Quasi-Continuous Atom Laser

E. W. Hagley, 1 L. Deng, 12 M. Kozuma, 3 J. Wen, 1 K. Helmerson, 1 S. L. Rolston, 1 W. D. Phillips 1

Extraction of sodium atoms from a trapped Bose-Einstein condensate (BEC) by a coherent, stimulated Raman process is demonstrated. Optical Raman pulses drive transitions between trapped and untrapped magnetic sublevels, giving the output-coupled BEC fraction a well-defined momentum. The pulsed output coupling can be run at such a rate that the extracted atomic wave packets strongly overlap, forming a highly directional, quasi-continuous matter wave.

1 National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
2 Georgia Southern University, Statesboro, GA 30460, USA.
3 Institute of Physics, University of Tokyo, Tokyo 153-8902, Japan.

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