Optically Pumped Magnetometer and Its Application

<p>The optically pumped magnetometer (OPM) is a class of atomic devices that rely on the measurement of Larmor precession of an atomic spin ensemble in a magnetic field. They need the specific frequency light to complete the pumping and detection process. OPMs typically work under the Earth's magnetic field or a limited field. When operating in near-zero field they can realize the spin-exchange relaxation-free (SERF) regime thereby promoting a substantial increase in sensitivity. At present OPMs have been widely used in magnetoencephalography magnetocardiography geomagnetic detection and inertia measurement (comagnetometer). There are a large number of researchers engaged in the study of relevant mechanisms devices technologies and applications. More importantly supported by MEMS technology and micro/nano optics OPMs have the potential to move toward chip-scale sensors. This special issue contains some latest developments in OPMs and related areas. We hope the reprint can provide valuable references for researchers in the related field.</p>