Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell

doi:10.1088/1674-1056/24/11/113701

中国物理B ›› 2015, Vol. 24 ›› Issue (11): 113701-113701.doi: 10.1088/1674-1056/24/11/113701

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Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell

黄家强^{a c}, 张建伟^{b c}, 王时光^{b c}, 王正博^{b c}, 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

收稿日期:2015-07-11 修回日期:2015-08-17 出版日期:2015-11-05 发布日期:2015-11-05
通讯作者: Zhang Jian-Wei, Wang Li-Jun E-mail:Zhangjw@tsinghua.edu.cn;lwan@tsinghua.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11304177).

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

Received:2015-07-11 Revised:2015-08-17 Online:2015-11-05 Published:2015-11-05
Contact: Zhang Jian-Wei, Wang Li-Jun E-mail:Zhangjw@tsinghua.edu.cn;lwan@tsinghua.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11304177).

摘要/Abstract

摘要： 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 6²S_1/2 (F=4)→²P_3/2 (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.

关键词: diffuse laser cooling, laser spectroscopy, atomic collision

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 6²S_1/2 (F=4)→²P_3/2 (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.

Key words: diffuse laser cooling, laser spectroscopy, atomic collision

中图分类号: (Atom cooling methods)

37.10.De

42.62.Fi (Laser spectroscopy) 34.35.+a (Interactions of atoms and molecules with surfaces)

黄家强, 张建伟, 王时光, 王正博, 王力军. Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell[J]. 中国物理B, 2015, 24(11): 113701-113701.

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[J]. Chin. Phys. B, 2015, 24(11): 113701-113701.

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Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell

Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell

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