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Chin. Phys. B, 2024, Vol. 33(12): 120703    DOI: 10.1088/1674-1056/ad84d0
INSTRUMENTATION AND MEASUREMENT Prev   Next  

Apparatus for producing single strontium atoms in an optical tweezer array

Kai Wen(文凯)1,†, Huijin Chen(陈辉锦)1,†, Xu Yan(颜煦)2, Zejian Ren(任泽剑)1, Chengdong He(何成东)2, Elnur Hajiyev2, Preston Tsz Fung Wong(黄梓峰)2, and Gyu-Boong Jo1,2,‡
1 Microelectronics Thrust, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou 511455, China;
2 Department of Physics, The Hong Kong University of Science and Technology, Hong Kong 999077, China
Abstract  We outline an experimental setup for efficiently preparing a tweezer array of $^{88}$Sr atoms. Our setup uses permanent magnets to maintain a steady-state two-dimensional magneto-optical trap (MOT) which results in a loading rate of up to $10^{8}$ s$^{-1}$ at 5 mK for the three-dimensional blue MOT. This enables us to trap $2\times10^{6}$ $^{88}$Sr atoms at 2 μK in a narrow-line red MOT with the $^{1}$S$_{0}$ $\rightarrow$ $^{3}$P$_{1}$ intercombination transition at 689 nm. With the Sisyphus cooling and pairwise loss processes, single atoms are trapped and imaged in 813 nm optical tweezers, exhibiting a lifetime of 2.5 min. We further investigate the survival fraction of a single atom in the tweezers and characterize the optical tweezer array using a release and recapture technique. Our experimental setup serves as an excellent reference for those engaged in experiments involving optical tweezer arrays, cold atom systems, and similar research.
Keywords:  optical tweezer array      single atom      sisyphus cooling  
Received:  20 August 2024      Revised:  26 September 2024      Accepted manuscript online:  09 October 2024
PACS:  07.77.Gx (Atomic and molecular beam sources and detectors)  
  03.75.-b  
Fund: GBJ acknowledges support from the RGC through 16306119, 16302420, 16302821, 16306321, 16306922, 16302123, C6009-20G, N-HKUST636-22, and RFS2122-6S04. KW acknowledges support from the Guangzhou and Nansha District Postdoctoral Project. CH acknowledges support from the RGC for RGC Postdoctoral fellowship.
Corresponding Authors:  Gyu-Boong Jo     E-mail:  gbjo@ust.hk

Cite this article: 

Kai Wen(文凯), Huijin Chen(陈辉锦), Xu Yan(颜煦), Zejian Ren(任泽剑), Chengdong He(何成东), Elnur Hajiyev, Preston Tsz Fung Wong(黄梓峰), and Gyu-Boong Jo Apparatus for producing single strontium atoms in an optical tweezer array 2024 Chin. Phys. B 33 120703

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