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Rapid extraction of the phase shift of the cold-atom interferometer via phase demodulation |
| Cheng Bing (程冰)a, Wang Zhao-Ying (王兆英)a, Xu Ao-Peng (许翱鹏)a, Wang Qi-Yu (王启宇)a, Lin Qiang (林强)a b |
a Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027, China;
b Center for Optics and Optoelectronics Research, College of Science, Zhejiang University of Technology, Hangzhou 310023, China |
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Abstract Generally, the phase of the cold-atom interferometer is extracted from the atomic interference fringe, which can be obtained by scanning the chirp rate of the Raman lasers at a given interrogation time T. If mapping the phase shift for each T with a series of measurements, the extraction time is limited by the protocol of each T measurement, and therefore increases dramatically when doing fine mapping with a small step of T. Here we present a new method for rapid extraction of the phase shift via phase demodulation. By using this method, the systematic shifts can be mapped though the whole interference area. This method enables quick diagnostics of the potential cause of the phase shift in specific time. We demonstrate experimentally that this method is effective for the evaluation of the systematic errors of the cold atomic gravimeter. The systematic phase error induced by the quadratic Zeeman effect in the free-falling region is extracted by this method. The measured results correspond well with the theoretic prediction and also agree with the results obtained by the fringe fitting method for each T.
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Received: 10 May 2015
Revised: 27 June 2015
Accepted manuscript online:
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PACS:
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37.25.+k
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(Atom interferometry techniques)
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32.60.+i
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(Zeeman and Stark effects)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11174249 and 61475139), the Ministry of Science and Technology of China (Grant No. 2011AA060504), the National Basic Research Program of China (Grant No. 2013CB329501), and the Fundamental Research Funds for the Central Universities, China (Grant No. 2015FZA3002). |
Corresponding Authors:
Wang Zhao-Ying, Lin Qiang
E-mail: zhaoyingwang@zju.edu.cn;qlin@zjut.edu.cn
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Cite this article:
Cheng Bing (程冰), Wang Zhao-Ying (王兆英), Xu Ao-Peng (许翱鹏), Wang Qi-Yu (王启宇), Lin Qiang (林强) Rapid extraction of the phase shift of the cold-atom interferometer via phase demodulation 2015 Chin. Phys. B 24 113704
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