Open AccessProbe noise characteristics of the spin-exchange relaxation-free (SERF) magnetometer
Author(s) -
Bozheng Xing,
Chang Sun,
Ziao Liu,
Junpeng Zhao,
Jixi Lu,
Bangcheng Han,
M. D. Ding
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.416797
Subject(s) - noise (video) , noise spectral density , magnetometer , noise floor , shot noise , physics , optics , noise generator , noise measurement , sensitivity (control systems) , noise temperature , relative intensity noise , quantum noise , background noise , flicker noise , acoustics , nuclear magnetic resonance , noise figure , phase noise , noise reduction , magnetic field , optoelectronics , detector , electronic engineering , laser , computer science , cmos , artificial intelligence , image (mathematics) , amplifier , engineering , quantum , semiconductor laser theory , quantum mechanics
In the spin-exchange relaxation-free (SERF) magnetometer, the probe noise is a consequential factor affecting the gradiometric measurement sensitivities. In this paper, we proposed a new characteristics model of the probe noise based on noise separation. Different from noise analysis on single noise source, we considered most of the noise sources influencing the probe system and realized noise sources level measurement experimentally. The results demonstrate that the major noise type changes with the signal frequency. Below 10 Hz, the probe noise mainly comes from the sources independent of light intensity such as the vibration, which accounts for more than 50%; while at 30 Hz, the photon shot noise and the magnetic noise are the main origins, with proportion about 43% and 32%, respectively. Moreover, the results indicate that the optimal probe light intensity with highest sensitivity appears when the response of the magnetic noise is equal to the sum of the electronic noise and half of the shot noise. The optimal intensity gets larger with higher signal frequency. The noise characteristics model could be applied in modulating or differential optical systems and helps sensitivity improvement in SERF magnetometer.