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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DOI：
10.1088/1674-1056/24/11/113701
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
J. Huang;J. Zhang;S. Wang;Z. B. Wang;L. J. Wang
中科院分区：
文献类型：
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作者：
J. Huang;J. Zhang;S. Wang;Z. B. Wang;L. J. Wang
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)-62P3/2 (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*10^9 to 3.7*10^8 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.
