Alignment-Based Optically Pumped Magnetometer Using a Buffer-Gas Cell
Alignment-Based Optically Pumped Magnetometer Using a Buffer-Gas Cell
复制标题
DOI：
10.1103/physrevapplied.19.064047
复制
发表时间：
2023-01
影响因子：
4.6
通讯作者：
L. M. Rushton;L. Elson;A. Meraki;K. Jensen
中科院分区：
文献类型：
--
作者：
L. M. Rushton;L. Elson;A. Meraki;K. Jensen
基于排列的光泵磁强计(OPM)能够在FT/SQRT(赫兹)范围内以高灵敏度测量振荡磁场。到目前为止，基于排列的磁强计只使用涂有石蜡的蒸汽室来延长碱性蒸气的自旋弛豫寿命。这些电池的缺点是它们是手工吹制的，因此生产起来很耗时，而且有点不可靠。另一方面，缓冲气室可以使用微制造技术大规模制造。我们首次展示了一种基于排列的磁力计，它使用一个含有铯(Cs)、碱蒸汽和氮(N_2)缓冲气体的缓冲气体蒸汽室。OPM工作在55摄氏度，我们实现了对带宽为800赫兹的10 kHz振荡磁场的325 FT/SQRT(赫兹)灵敏度。基于准直的磁强计使用单束激光进行光学泵浦和探测，由于单束几何结构的健壮性和缓冲气体室的大规模微制造潜力，可能允许更快地实现射频OPM的商业化。
Alignment-based optically pumped magnetometers (OPMs) are capable of measuring oscillating magnetic fields with high sensitivity in the fT/sqrt(Hz) range. Until now, alignment-based magnetometers have only used paraffin-coated vapour cells to extend the spin relaxation lifetimes of the alkali vapour. The drawback of these cells is that they are hand-blown and are therefore time-intensive, and somewhat unreliable, to produce. Buffer gas cells, on the other hand, can be manufactured on a mass scale using microfabrication techniques. We present the first demonstration of an alignment-based magnetometer using a buffer gas vapour cell containing caesium (Cs) alkali vapour and nitrogen (N2) buffer gas. The OPM is operated at 55 degrees C and we achieve a 325 fT/sqrt(Hz) sensitivity to 10 kHz oscillating magnetic fields with an 800 Hz bandwidth. The alignment-based magnetometer uses a single laser beam for optical pumping and probing and could potentially allow for more rapid commercialisation of radio-frequency OPMs, due to the robustness of the one-beam geometry and the potential for mass-scale microfabrication of buffer gas cells.