Suppression of Light Shift for High-Density Alkali-Metal Atomic Magnetometer

The light shift is an important error source for atomic magnetometers. It would vanish if the frequency of the circularly polarized light is tuned to the optical resonance center. For high-density alkali-metal atomic magnetometers, the vapor cell has a large optical depth near the resonance, resulti...

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Bibliographic Details
Published in:IEEE sensors journal 2019-01, Vol.19 (2), p.492-496
Main Authors: Lu, Jixi, Quan, Wei, Ding, Ming, Qi, Lu, Fang, Jiancheng
Format: Article
Language:English
Subjects:
Absorption
Alkali metals
Atom optics
Circular polarization
Density
high-density atomic magnetometer
Light shift
Magnetic noise
Magnetic resonance
Magnetic shielding
Magnetometers
optical absorption
Optical pumping
Optical resonance
Optical variables measurement
Polarized light
spin-exchange relaxation-free
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Summary:The light shift is an important error source for atomic magnetometers. It would vanish if the frequency of the circularly polarized light is tuned to the optical resonance center. For high-density alkali-metal atomic magnetometers, the vapor cell has a large optical depth near the resonance, resulting in the difficulty in obtaining the exact resonance center by measuring the optical absorption line. In order to solve this problem, we propose a method to tune the pump light to a frequency where the shift is minimum based on the magnetic field zeroing technique. In addition, we also compare our results with the fitting center of the optical absorption line based on the measurement data far detuned from the resonance. The experimental results show that our method achieves a better suppression result of the light shift.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2018.2877771