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Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell |
| Huang Jia-Qiang (黄家强)a c, Zhang Jian-Wei (张建伟)b c, Wang Shi-Guang (王时光)b c, Wang Zheng-Bo (王正博)b c, Wang Li-Jun (王力军)a b c |
a Department of Physics, Tsinghua University, Beijing 100084, China;
b Department of Precision Instruments, Tsinghua University, Beijing 100084, China;
c Joint Institute for Measurement Science (JMI), Tsinghua University, Beijing 100084, China |
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Abstract We report an experimental study on the temperature and number evolution of cold cesium atoms diffusively cooled inside a wall-coated glass cell by measuring the absorption profile of the 62S1/2 (F=4)→2P3/2 (F’=5) transition line with a weak probe laser in the evolution process. We found that the temperature of the cold atoms first gradually decreases from 16 mK to 9 mK, and then rapidly increases. The number of cold atoms first declines slowly from 2.1×109 to 3.7×108 and then falls drastically. A theoretical model for the number evolution is built and includes the instantaneous temperature of the cold atoms and a fraction p, which represents the part of cold cesium atoms elastically reflected by the coated cell wall. The theory is overall in good agreement with the experimental result, and a nonzero value is obtained for the fraction p, which indicates that the cold cesium atoms are not all heated to the ambient temperature by a single collision with the coated cell wall. These results can provide helpful insight for precision measurements based on diffuse laser cooling.
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Received: 11 July 2015
Revised: 17 August 2015
Accepted manuscript online:
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PACS:
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37.10.De
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(Atom cooling methods)
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42.62.Fi
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(Laser spectroscopy)
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34.35.+a
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(Interactions of atoms and molecules with surfaces)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11304177). |
Corresponding Authors:
Zhang Jian-Wei, Wang Li-Jun
E-mail: Zhangjw@tsinghua.edu.cn;lwan@tsinghua.edu.cn
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Cite this article:
Huang Jia-Qiang (黄家强), Zhang Jian-Wei (张建伟), Wang Shi-Guang (王时光), Wang Zheng-Bo (王正博), Wang Li-Jun (王力军) Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell 2015 Chin. Phys. B 24 113701
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