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Sensors 2016, 16(6), 896; doi:10.3390/s16060896

Measurement Sensitivity Improvement of All-Optical Atomic Spin Magnetometer by Suppressing Noises

1,2,†,* , 1,2,†
and
1,2
1
School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China
2
Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of Education, Nanjing 210096, China
The first two authors should be regarded as joint first authors.
*
Author to whom correspondence should be addressed.
Academic Editor: Caterina Ciminelli
Received: 28 February 2016 / Revised: 30 May 2016 / Accepted: 2 June 2016 / Published: 17 June 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [3024 KB, uploaded 17 June 2016]   |  

Abstract

Quantum manipulation technology and photoelectric detection technology have jointly facilitated the rapid development of ultra-sensitive atomic spin magnetometers. To improve the output signal and sensitivity of the spin-exchange-relaxation-free (SERF) atomic spin magnetometer, the noises influencing on the output signal and the sensitivity were analyzed, and the corresponding noise suppression methods were presented. The magnetic field noises, including the residual magnetic field noise and the light shift noise, were reduced to approximately zero by employing the magnetic field compensation method and by adjusting the frequency of the pump beam, respectively. With respect to the operation temperature, the simulation results showed that the temperature of the potassium atomic spin magnetometer realizing the spin-exchange relaxation-free regime was 180 °C. Moreover, the fluctuation noises of the frequency and the power were suppressed by using the frequency and the power stable systems. The experimental power stability results showed that the light intensity stability was enhanced 10%. Contrast experiments on the sensitivity were carried out to demonstrate the validity of the suppression methods. Finally, a sensitivity of 13 fT/Hz1/2 was successfully achieved by suppressing noises and optimizing parameters. View Full-Text
Keywords: all optical; atomic spin magnetometer; noise; sensitivity all optical; atomic spin magnetometer; noise; sensitivity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Chen, X.; Zhang, H.; Zou, S. Measurement Sensitivity Improvement of All-Optical Atomic Spin Magnetometer by Suppressing Noises. Sensors 2016, 16, 896.

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