Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell
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)-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.
Keywords
Cite
@article{arxiv.1505.06528,
title = {Temperature and number evolution of cold cesium atoms inside a wall-coated glass cell},
author = {J. Q. Huang and J. W. Zhang and S. G. Wang and Z. B. Wang and L. J. Wang},
journal= {arXiv preprint arXiv:1505.06528},
year = {2017}
}