Light-induced evaporative cooling in a magneto-optical trap
Ma Hong-Yu (马红玉)ab, Cheng Hua-Dong (成华东)a, Wang Yu-Zhu (王育竹)a, Liu Liang (刘 亮)a
a Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; b Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
Abstract This paper presents an experimental demonstration of light-induced evaporative cooling in a magneto-optical trap. An additional laser is used to interact with atoms at the edge of the atomic cloud in the trap. These atoms get an additional force and evaporated away from the trap by both the magnetic field and laser fields. The remaining atoms have lower kinetic energy and thus are cooled. It reports the measurements on the temperature and atomic number after the evaporative cooling with different parameters including the distance between the laser and the centre of the atomic cloud, the detuning, the intensity. The results show that the light-induced evaporative cooling is a way to generate an ultra-cold atom source.
Received: 27 February 2008
Revised: 26 May 2008
Accepted manuscript online:
(Mechanical effects of light on atoms, molecules, and ions)
Fund: Project
supported by the Shanghai Pujiang Programme and the National Basic
Research Programme of China (Grant No 2005CB724506) and the National
Natural Science Foundation of China (Grant No 10604057).
Cite this article:
Ma Hong-Yu (马红玉), Cheng Hua-Dong (成华东), Wang Yu-Zhu (王育竹), Liu Liang (刘 亮) Light-induced evaporative cooling in a magneto-optical trap 2008 Chin. Phys. B 17 4180
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