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A High Sensitivity Laser-Pumped Cesium Magnetometer |
HUANG Kai-Kai, LI Nan, LU Xuan-Hui** |
Institute of Optics, Department of Physics, Zhejiang University, Hangzhou 310027
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Cite this article: |
HUANG Kai-Kai, LI Nan, LU Xuan-Hui 2012 Chin. Phys. Lett. 29 100701 |
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Abstract An atomic magnetometer based on optically detected magnetic resonance is investigated and demonstrated experimentally. We build an 894 nm external cavity diode laser which is frequency locked to the F=4→F'=3 transition of Cs D1 line with DAVLL spectroscopy. With the phase-locked loop, the frequency of the rf coils is actively locked to the Larmor frequency and the magnetometer tracks the magnetic field variations in a phase coherent manner. An ultimate sensitivity of 19 fT/Hz1/2 and an intrinsic sensitivity of 8.6 pT/Hz1/2 in the magnetic environment which is close to geomagnetic field have been achieved with the spatial resolution smaller than 2 cm.
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Received: 07 March 2012
Published: 01 October 2012
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PACS: |
07.55.Ge
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(Magnetometers for magnetic field measurements)
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33.80.Be
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(Level crossing and optical pumping)
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33.80.+i
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76.70.Hb
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(Optically detected magnetic resonance (ODMR))
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Abstract
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