Chin. Phys. Lett.  2018, Vol. 35 Issue (8): 086701    DOI: 10.1088/0256-307X/35/8/086701
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Observation of Atomic Dynamic Behaviors in the Evaporative Cooling by In-Situ Imaging the Plugged Hole of Ultracold Atoms
Tian-You Gao1,3, Dong-Fang Zhang1**, Ling-Ran Kong1,3, Rui-Zong Li1,3, Kai-Jun Jiang1,2**
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
2Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071
3University of Chinese Academy of Sciences, Beijing 100049
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Tian-You Gao, Dong-Fang Zhang, Ling-Ran Kong et al  2018 Chin. Phys. Lett. 35 086701
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Abstract We experimentally observe the dynamic evolution of atoms in the evaporative cooling, by in-situ imaging the plugged hole of ultracold atoms. Ultracold rubidium atoms confined in a magnetic trap are plugged using a blue-detuned laser beam with a waist of 20 μm at a wavelength of 767 nm. We probe the variation of the atomic temperature and width versus the radio frequency in the evaporative cooling. Both the behaviors are in good agreement with the calculation of the trapping potential dressed by the rf signal above the threshold temperature, while deviating from the calculation near the phase transition. To accurately obtain the atomic width, we use the plugged hole as the reference to optimize the optical imaging system by precisely minimizing the artificial structures due to the defocus effect.
Received: 20 April 2018      Published: 15 July 2018
PACS:  67.85.-d (Ultracold gases, trapped gases)  
  67.10.Ba (Boson degeneracy)  
  64.70.fm (Thermodynamics studies of evaporation and condensation)  
  37.10.De (Atom cooling methods)  
Fund: Supported by the National Key Research and Development Program of China under Grant No 2016YFA0301503, the National Natural Science Foundation of China under Grant Nos 11674358 and 11434015, and the Instrument Project of the Chinese Academy of Sciences under Grant No YJKYYQ20170025.
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https://cpl.iphy.ac.cn/10.1088/0256-307X/35/8/086701       OR      https://cpl.iphy.ac.cn/Y2018/V35/I8/086701
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Tian-You Gao
Dong-Fang Zhang
Ling-Ran Kong
Rui-Zong Li
Kai-Jun Jiang
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