| ATOMIC AND MOLECULAR PHYSICS |
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State Preparation in a Cold Atom Clock by Optical Pumping |
| Yu-Xiong Duan1,2, Bin Wang1**, Jing-Feng Xiang1,2, Qian Liu1,2, Qiu-Zhi Qu1, De-Sheng Lü1, Liang Liu1 |
1Key Laboratory of Quantum Optics, and Center for Cold Atom Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800
2University of Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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Yu-Xiong Duan, Bin Wang, Jing-Feng Xiang et al 2017 Chin. Phys. Lett. 34 073201 |
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Abstract We implement optical pumping to prepare cold atoms in our prototype of the $^{87}$Rb space cold atom clock, which operates in the one-way mode. Several modifications are made on our previous physical and optical system. The effective atomic signal in the top detection zone is increased to 2.5 times with 87% pumping efficiency. The temperature of the cold atom cloud is increased by 1.4 $\mu$K. We study the dependences of the effective signal gain and pumping efficiency on the pumping laser intensity and detuning. The effects of $\sigma$ transition are discussed. This technique may be used in the future space cold atom clocks.
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Received: 20 April 2017
Published: 23 June 2017
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| PACS: |
32.10.Fn
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(Fine and hyperfine structure)
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32.80.Xx
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(Level crossing and optical pumping)
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07.87.+v
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(Spaceborne and space research instruments, apparatus, and components (satellites, space vehicles, etc.))
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| Fund: Supported by the Fund from the Ministry of Science and Technology of China under Grant No 2013YQ09094304, and the Youth Innovation Promotion Association of Chinese Academy of Sciences. |
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