Application of absorption measurements to the temperature determination of a cloud of cold Cesium atoms

Stella Müller, Daniel Varela Magalhães, Aida Bebeachibuli +2 more

He Jun, Wang Jing, Qiu Ying +4 more

The basic model and the experimental measurement method of short-distance time-of-flight absorption spectra for determining the temperature of cold atoms are described. Based on the realization of temperature measurement of cold cesium atoms in a magneto-optical trap，the influences of measurement errors of the three experimental parameters，namely the falling distance h，the initial Gaussian radius σ0 of the cold cloud, and the Gaussian radius σp of probe beam, on the determination of temperature have been analyzed and compared.

Ch Salomon, Jean Dalibard

王旭成 Wang Xucheng, 成华东 Cheng Huadong, 肖玲 Xiao Ling +3 more

Tao Geng, 闫树斌 Yan Shubin, Yanhua Wang +4 more

We report the basic idea and experimental demonstration of measuring the temperature of cold cesium atomic cloud confined in a magneto-optical trap (MOT) by analyzing absorption spectrum observed in the short-distance time-of-flight (TOF) method. Compared with the conventional TOF scheme, we measure the temperature of cold atomic cloud in MOT by short-distance TOF method for our small vapor cell. If the cold atomic cloud is released, it will fall and expand due to gravity and its initial velocity distribution. Utilizing a cylindrical resonant probe beam positioned several millimeters beneath the MOT (in this paper, we analyzed the cases for 3mm, 5mm, and 8mm of center-to-center distance between the MOT region and the probe beam, respectively), we can record the short-distance TOF absorption spectrum with a photodiode when cold atoms go through the probe region. Analysis of the short-distance TOF absorption spectrum yields the effective temperature of the cold cloud in MOT.

Jianming Zhao, Lirong Wang, Liantuan Xiao +3 more