| ATOMIC AND MOLECULAR PHYSICS |
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Coherent Population Trapping-Ramsey Interference in Cold Atoms |
| CHEN Xi1,2,3, YANG Guo-Qing1,2,3, WANG Jin1,2**, ZHAN Ming-Sheng1,2 |
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, and Wuhan National Laboratory for Optoelectronics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
2Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071
3Graduate University Chinese Academy of Sciences, Beijing 100049
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| Cite this article: |
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CHEN Xi, YANG Guo-Qing, WANG Jin et al 2010 Chin. Phys. Lett. 27 113201 |
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Abstract We demonstrate an experimental observation of coherent population trapping-Ramsey interference in cold 87Rb atoms by employing the time-domain separated oscillatory fields' method. The interference fringe with line width of 80 Hz is obtained. We propose a novel method to measure the cold atom number. The measurement is insensitive to the pump beam intensity, the single photon detuning and even the initial state population. We use this method to normalize the interference signal and to improve the signal-to-noise ratio significantly.
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| Keywords:
32.80.Pj
03.75.Lm
03.75.Dg
42.50.Gy
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Received: 10 August 2010
Published: 22 October 2010
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| PACS: |
32.80.Pj
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03.75.Lm
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(Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)
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03.75.Dg
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(Atom and neutron interferometry)
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42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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