Production of $^{87}$Rb Bose–Einstein Condensate with a Simple Evaporative Cooling Method
Rehman Fazal1 , Jia-Zhen Li1 , Zhi-Wen Chen1 , Yuan Qin1 , Ya-Yi Lin1 , Zuan-Xian Zhang1 , Shan-Chao Zhang1** , Wei Huang1** , Hui Yan1 , Shi-Liang Zhu1,2
1 Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, GPETR Center for Quantum Precision Measurement and SPTE, South China Normal University, Guangzhou 5100062 National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093
Abstract ：A Bose–Einstein condensate with a large atom number is an important experimental platform for quantum simulation and quantum information research. An optical dipole trap is the a conventional way to hold the ultracold atoms, where an atomic cloud is evaporatively cooled down before reaching the Bose–Einstein condensate. A carefully designed trap depth controlling curve is typically required to realize the optimal evaporation cooling. We present and demonstrate a simple way to optimize the evaporation cooling in a crossed optical dipole trap. A polyline shape optical power control profile is easily obtained with our method, by which a pure Bose–Einstein condensate with atom number $1.73\times10^5 $ is produced. Theoretically, we numerically simulate the optimal evaporation cooling using the parameters of our apparatus based on a kinetic theory. Compared to the simulation results, our evaporation cooling shows a good performance. We believe that our simple method can be used to quickly realize evaporation cooling in optical dipole traps.
收稿日期: 2019-12-17
出版日期: 2020-02-22
:
67.85.Hj
(Bose-Einstein condensates in optical potentials)
37.10.-x
(Atom, molecule, and ion cooling methods)
64.70.fm
(Thermodynamics studies of evaporation and condensation)
引用本文:
. [J]. 中国物理快报, 2020, 37(3): 36701-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/37/3/036701
或
https://cpl.iphy.ac.cn/CN/Y2020/V37/I3/36701
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2020, Vol. 37 
