| ATOMIC AND MOLECULAR PHYSICS |
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Laser Cooling of 87Rb to 1.5µK in a Fountain Clock |
| WANG Bin1, LÜ De-Sheng1**, QU Qiu-Zhi1, ZHAO Jian-Bo1, LI Tang1, LIU Liang1,2**, WANG Yu-Zhu1
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1Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
2State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062 |
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| Cite this article: |
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WANG Bin, LÜ, De-Sheng et al 2011 Chin. Phys. Lett. 28 063701 |
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Abstract We report an experiment on the adiabatic cooling of 87Rb atoms in an atomic fountain to a temperature as low as 1.5 μK, which is roughly twice the recoil temperature. The atomic fountain has the (1,1,1) optical geometry for cooling and launching of cold atoms. The atoms are first cooled in an optical molasses of 6 beams to 3.4 μK by polarization gradient geometry and then are adiabatically cooled by decreasing the intensity of laser from 1.8Is per beam to zero in 1 ms during the launching of cold atoms. We also study the dependences of atomic temperature on different laser parameters. The method we used is useful in any cold atom physics experiment.
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| Keywords:
37.10.De
37.10.Vz
32.10.Fn
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Received: 08 March 2011
Published: 29 May 2011
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| PACS: |
37.10.De
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(Atom cooling methods)
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37.10.Vz
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(Mechanical effects of light on atoms, molecules, and ions)
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32.10.Fn
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(Fine and hyperfine structure)
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