Chin. Phys. Lett.  2011, Vol. 28 Issue (1): 013701    DOI: 10.1088/0256-307X/28/1/013701
ATOMIC AND MOLECULAR PHYSICS |
Measurement of Local Gravity via a Cold Atom Interferometer
ZHOU Lin1,2,3, XIONG Zong-Yuan1,2,3, YANG Wei1,2,3, TANG Biao1,2,3, PENG Wen-Cui1,2,3, WANG Yi-Bo1,2,3, XU Peng1,2,3, WANG Jin1,2, ZHAN Ming-Sheng1,2**
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences-Wuhan National Laboratory for Optoelectronics, Wuhan 430071
2Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071
3Graduate University of the Chinese Academy of Sciences, Beijing 100049
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ZHOU Lin, XIONG Zong-Yuan, YANG Wei et al  2011 Chin. Phys. Lett. 28 013701
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Abstract We demonstrate a precision measurement of local gravity acceleration g in Wuhan by a compact cold atom interferometer. The atom interferometer is in vertical Mach–Zehnder configuration realized using a π/2−π-π/2 Raman pulse sequence. Cold atoms were prepared in a magneto-optical trap, launched upward to form an atom fountain, and then coherently manipulated to interfere by stimulated Raman transition. Population signal vs Raman laser phase was recorded as interference fringes, and the local gravity was deduced from the interference signal. We have obtained a resolution of 7×10−9 g after an integration time of 236 s under the best vibrational environment conditions. The absolute g value was derived from the chirp rate with a difference of 1.5×10−7 g compared to the gravity reference value. The tidal phenomenon was observed by continuously monitoring the local gravity over 123 h.
Keywords: 37.25.+k      04.80.Nn      06.30.Gv     
Received: 24 June 2010      Published: 23 December 2010
PACS:  37.25.+k (Atom interferometry techniques)  
  04.80.Nn (Gravitational wave detectors and experiments)  
  06.30.Gv (Velocity, acceleration, and rotation)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/28/1/013701       OR      https://cpl.iphy.ac.cn/Y2011/V28/I1/013701
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ZHOU Lin
XIONG Zong-Yuan
YANG Wei
TANG Biao
PENG Wen-Cui
WANG Yi-Bo
XU Peng
WANG Jin
ZHAN Ming-Sheng
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