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

• 作者: Wang Li-Jun 张建伟 王力军 王时光 黄家强
• 来源期刊: 中国物理B（英文版）
• 关键词: diffuse laser cooling laser spectroscopy atomic collision
• 年，卷（期）: 2015,（11）
• 页码范围: 113701-1-113701-6
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/11/113701

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 62S1/2 (F=4)→62P3/2(F0=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.