Production of $^{87}$Rb Bose–Einstein Condensate in an Asymmetric Crossed Optical Dipole Trap
Zhu Ma1,2† , Chengyin Han1† , Xunda Jiang1,2 , Ruihuan Fang1,2 , Yuxiang Qiu1,2 , Minhua Zhao1,2 , Jiahao Huang1 , Bo Lu1* , and Chaohong Lee1,2*
1 Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing & School of Physics and Astronomy, Sun Yat-Sen University (Zhuhai Campus), Zhuhai 519082, China2 State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-Sen University (Guangzhou Campus), Guangzhou 510275, China
Abstract ：We report the production of $^{87}$Rb Bose–Einstein condensate in an asymmetric crossed optical dipole trap (ACODT) without the need of an additional dimple laser. In our experiment, the ACODT is formed by two laser beams with different radii to achieve efficient capture and rapid evaporation of laser cooled atoms. Compared to the cooling procedure in a magnetic trap, the atoms are firstly laser cooled and then directly loaded into an ACODT without the pre-evaporative cooling process. In order to determine the optimal parameters for evaporation cooling, we optimize the power ratio of the two beams and the evaporation time to maximize the final atom number left in the ACODT. By loading about $6\times10^{5}$ laser cooled atoms in the ACODT, we obtain a pure Bose–Einstein condensate with about $1.4\times10^{4}$ atoms after 19 s evaporation. Additionally, we demonstrate that the fringe-type noises in optical density distributions can be reduced via principal component analysis, which correspondingly improves the reliability of temperature measurement.
收稿日期: 2021-08-20
出版日期: 2021-09-26
:
67.85.Hj
(Bose-Einstein condensates in optical potentials)
37.10.De
(Atom cooling methods)
64.70.fm
(Thermodynamics studies of evaporation and condensation)
引用本文:
. [J]. 中国物理快报, 2021, 38(10): 103701-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/38/10/103701
或
https://cpl.iphy.ac.cn/CN/Y2021/V38/I10/103701
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2021, Vol. 38 
