Measurement of noise of current source by pump-probe atomic magnetometer

<sec>The stable and reproducible magnetic field generated by a precision current source coil is usually used to calibrate the sensitivity of an atomic magnetometer. The noise directly determines field. Therefore highly sensitive magnetometer can be measure source.</sec><sec>In this paper, pump-probe estimate noises two sources in wide range. Firstly, order suppress drift field, which caused or gradual change magnetization shielding materials, method implementing compensation using B2912A with small proposed realized. experimental results show that significantly suppresses reduces amplitude power spectral density values less than 0.1 Hz, but have little effect on more Hz. Secondly, relationship between range respectively verified experimentally. When varies from 100 nT 10000 nT, increases stepwise 0.2 pT/Hz<sup>1/2</sup> 15 generate while always about 20 DC analyzer N6705B 5000 6000 resolution changes nA 1 μA, leading peak measured 23 pT 230 pT. In same transformation process 2 causing maintain at 300 limited thus estimated set supplied 94.8 mA, 22.70 nA/Hz<sup>1/2</sup> 0.39 μA/Hz<sup>1/2</sup>, respectively. value 20% resolution, will given reasonable explanation combining data processing calibration details future.</sec><sec>Our research great significance calibrating sensor, developing high-precision sources, co-developing induction metrology metrology.</sec>