Optically pumped atomic magnetometers (OPAMs) have been demonstrated to show sensitivities better than the order of a few femtoteslas. In this study, we developed a portable potassium OPAM module using an electrically heated oven and orthogonal pump and probe beams coupled from polarization-maintaining optical fibers. The OPAM module shared a volume as small as 700 cm3, and its footprint was as small as 60 × 60 mm2; it operated with a single-channel sensitivity of 14 fTrms/Hz1/2 at 100 Hz when the 2-cm cubic potassium cell was heated to 180 °C. In our module, the optical beam path was folded along the magnetic field to be measured. The development of a magnetic sensor device comprising an array of OPAM modules will be an important step toward realizing a biomagnetic imaging system based on OPAMs. The orthogonal two-beam OPAMs will be beneficial for realizing a flexible placement of the array.
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机译:已经证明,光泵原子磁强计(OPAM)的灵敏度比几个飞特拉斯的数量级要好。在这项研究中,我们使用电加热烤箱,正交泵和由偏振保持光纤耦合的探测光束开发了便携式钾OPAM模块。 OPAM模块的体积小至700 cm 3 sup>,占地面积小至60×60 mm 2 sup>;当将2厘米立方钾电池加热到180°C时,它在100 Hz时的单通道灵敏度为14 fT rms inf> / Hz 1/2 sup>。在我们的模块中,光束路径沿着要测量的磁场折叠。包括OPAM模块阵列的磁传感器设备的开发将是实现基于OPAM的生物磁成像系统的重要一步。正交两光束OPAM将有利于实现阵列的灵活放置。
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