A High Sensitivity Laser-Pumped Cesium Magnetometer

An atomic magnetometer based on optically detected magnetic resonance is investigated and demonstrated experimentally. We build an 894nm external cavity diode laser which is frequency locked to the F = 4 arrow right F' = 3 transition of Cs D sub(1) line with DAVLL spectroscopy. With the phase-l...

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Bibliographic Details
Published in:Chinese physics letters 2012-10, Vol.29 (10), p.100701-1-100701-3, Article 100701
Main Authors: Huang, Kai-Kai, Li, Nan, Lu, Xuan-Hui
Format: Article
Language:English
Subjects:
Coherence
Coils
Construction
Geomagnetic fields
Holes
Magnetic fields
Phase locked loops
Spectroscopy
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Summary:An atomic magnetometer based on optically detected magnetic resonance is investigated and demonstrated experimentally. We build an 894nm external cavity diode laser which is frequency locked to the F = 4 arrow right F' = 3 transition of Cs D sub(1) 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/Hz super(1/2) and an intrinsic sensitivity of 8.6 pT/Hz super(1/2) in the magnetic environment which is close to geomagnetic field have been achieved with the spatial resolution smaller than 2 cm.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/29/10/100701