Zhao Ni, Zhang Lulu, Yang Yongbiao, He Jun, Wang Yanhua, Li Tingyu, Wang Junmin
State Key Laboratory of Quantum Optics and Quantum Optics Devices and Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, Shanxi Province, China.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, Shanxi Province, China.
Rev Sci Instrum. 2023 Sep 1;94(9). doi: 10.1063/5.0159751.
This paper introduces a method for characterizing the current noise of commercial constant-current sources (CCSs) using a free-induction-decay (FID) type optically pumped rubidium atomic magnetometer driven by a radio frequency magnetic field. We convert the sensitivity of the atomic magnetometer into the current noise of CCS by calibrating the coil constant. At the same time, the current noise characteristics of six typical commercial low-noise CCSs are compared. The current noise level of the Keysight model B2961A is the lowest among the six tested CCSs, which is 36.233 ± 0.022 nA/Hz1/2 at 1-25 Hz and 133.905 ± 0.080 nA/Hz1/2 at 1-100 Hz. The sensitivity of the atomic magnetometer is dependent on the current noise level of the CCS. The CCS with low noise is of great significance for high-sensitivity atomic magnetometers. This research provides an important reference for promoting the development of high precision CCS, metrology, and basic physics research.
本文介绍了一种利用由射频磁场驱动的自由感应衰减（FID）型光泵铷原子磁力计来表征商用恒流源（CCS）电流噪声的方法。我们通过校准线圈常数将原子磁力计的灵敏度转换为CCS的电流噪声。同时，比较了六种典型商用低噪声CCS的电流噪声特性。在六个测试的CCS中，是德科技（Keysight）型号B2961A的电流噪声水平最低，在1 - 25Hz时为36.233±0.022 nA/Hz1/2，在1 - 100Hz时为133.905±0.080 nA/Hz1/2。原子磁力计的灵敏度取决于CCS的电流噪声水平。低噪声的CCS对高灵敏度原子磁力计具有重要意义。本研究为推动高精度CCS的发展、计量学以及基础物理研究提供了重要参考。
