Characterization of noise sources in a microfabricated single-beam zero-field optically-pumped magnetometer
Characterization of noise sources in a microfabricated single-beam zero-field optically-pumped magnetometer
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DOI：
10.1063/1.5098088
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发表时间：
2019-07-28
影响因子：
3.2
通讯作者：
Knappe, S.
中科院分区：
文献类型：
--
作者：
Krzyzewski, S. P.;Perry, A. R.;Knappe, S.
我们提出了一个实验的噪声特性的微型单光束吸收为基础的光泵磁力计的噪声底为7 fT/Hz（1/2）的自旋交换弛豫自由制度。我们实验评估的噪声所产生的激光强度，激光频率，激光偏振，细胞温度，和磁场线圈用于相敏检测的磁强计信号。我们发现，在DC和30 Hz之间的范围内的噪声是噪声源耦合到原子的方式类似于磁场的结果，而在30 Hz以上的频率的噪声主要是由于激光强度噪声。我们的研究结果对我们的系统的噪声源设置了上限，该上限与频率高于5 Hz的磁力计的噪声谱很好地匹配。
We present an experimental noise characterization of a miniature single-beam absorption-based optically-pumped magnetometer with a noise floor of 7fT/Hz(1/2) operating in the spin-exchange relaxation-free regime. We experimentally evaluate noise arising from the laser intensity, laser frequency, laser polarization, cell temperature, and magnetic field coils used for the phase-sensitive detection of the magnetometer signal. We find that noise in the range between DC and 30Hz is a result of noise sources coupling to the atoms in a manner similar to a magnetic field, while the noise at frequencies above 30Hz is mainly due to laser intensity noise. Our results place an upper limit on the noise sources for our system that matches well with the noise spectrum of the magnetometer at frequencies above 5Hz.