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Shiyao Shao(邵师尧), Qing Li(李庆), Lihua Zhang(张力华), Bang Liu(刘邦), Zhengyuan Zhang(张正源), Qifeng Wang(王启锋), Jun Zhang(张俊), Yu Ma(马宇), Tianyu Han(韩天宇), Hanchao Chen(陈瀚超), Jiadou Nan(南佳豆), Yiming Yin(殷一鸣), Dongyang Zhu(朱东杨), Yajun Wang(王雅君), Dongsheng Ding(丁冬生), and Baosen Shi(史保森). 2025: A Rb-Cs dual-species magneto-optical trap, Chinese Physics B, 34(6): 063702. doi: 10.1088/1674-1056/adc190
Citation: Shiyao Shao(邵师尧), Qing Li(李庆), Lihua Zhang(张力华), Bang Liu(刘邦), Zhengyuan Zhang(张正源), Qifeng Wang(王启锋), Jun Zhang(张俊), Yu Ma(马宇), Tianyu Han(韩天宇), Hanchao Chen(陈瀚超), Jiadou Nan(南佳豆), Yiming Yin(殷一鸣), Dongyang Zhu(朱东杨), Yajun Wang(王雅君), Dongsheng Ding(丁冬生), and Baosen Shi(史保森). 2025: A Rb-Cs dual-species magneto-optical trap, Chinese Physics B, 34(6): 063702. doi: 10.1088/1674-1056/adc190
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A Rb-Cs dual-species magneto-optical trap

  • 1 Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;

  • 2 Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

  • Received Date: 14/01/2025
    Accepted Date: 15/03/2025
  • Fund Project:

    Project supported by the National Key R&D Program of China (Grant No. 2022YFA1404002), the National Natural Science Foundation of China (Grant Nos. U20A20218, 61525504, 61435011, and T2495253), the Anhui Initiative in Quantum Information Technologies (Grant No. AHY020200), and the Major Science and Technology Projects in Anhui Province (Grant No. 202203a13010001).

  • PACS: 37.10.-x; 37.10.De; 42.50.Ct; 42.50.-p

  • We describe a three-dimensional (3D) magneto-optical trap (MOT) capable of simultaneously capturing 85Rb and 133Cs atoms. Unlike conventional setups, our system utilizes two separate laser systems that are combined before entering the vacuum chamber, enabling the simultaneous trapping of two different atomic species. We trapped 85Rb and 133Cs atoms using relatively low total power: 8 mW cooling and 4 mW repump for 85Rb, and 7.5 mW cooling and 1.5 mW repump for 133Cs. The number of trapped atoms was \(1.6 \times 10^8\) for 85Rb and \(1.4 \times 10^8\) for 133Cs. The optical depths were 3.71 for 85Rb and 3.45 for 133Cs. The temperature of trapped atoms was $\sim200$ μK for 85Rb and $\sim 200$ μK for 133Cs. Our 3D MOT setup allows full horizontal optical access to the trapped atomic ensembles without spatial interference from the trapping or repump laser beams. Our vacuum system is also quite simple, avoiding much of the complexity typically encountered in similar dual-species systems. However, the red detuning of the cooling laser used for atomic trapping in our system is relatively small, leaving room for further optimization. This system offers a versatile platform for exploring complex phenomena in ultracold atom physics, such as Rydberg molecule formation and interspecies interactions.
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A Rb-Cs dual-species magneto-optical trap

  • Received Date: 14/01/2025
  • Accepted Date: 15/03/2025
Fund Project: 

Abstract: We describe a three-dimensional (3D) magneto-optical trap (MOT) capable of simultaneously capturing 85Rb and 133Cs atoms. Unlike conventional setups, our system utilizes two separate laser systems that are combined before entering the vacuum chamber, enabling the simultaneous trapping of two different atomic species. We trapped 85Rb and 133Cs atoms using relatively low total power: 8 mW cooling and 4 mW repump for 85Rb, and 7.5 mW cooling and 1.5 mW repump for 133Cs. The number of trapped atoms was \(1.6 \times 10^8\) for 85Rb and \(1.4 \times 10^8\) for 133Cs. The optical depths were 3.71 for 85Rb and 3.45 for 133Cs. The temperature of trapped atoms was $\sim200$ μK for 85Rb and $\sim 200$ μK for 133Cs. Our 3D MOT setup allows full horizontal optical access to the trapped atomic ensembles without spatial interference from the trapping or repump laser beams. Our vacuum system is also quite simple, avoiding much of the complexity typically encountered in similar dual-species systems. However, the red detuning of the cooling laser used for atomic trapping in our system is relatively small, leaving room for further optimization. This system offers a versatile platform for exploring complex phenomena in ultracold atom physics, such as Rydberg molecule formation and interspecies interactions.

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