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Magnetic field imaging is a valuable resource for signal source localizationand characterization. This work reports an optically pumped magnetometer (OPM)based on the free-induction-decay (FID) protocol, that implementsmicrofabricated cesium (Cs) vapor cell technology to visualize the magneticfield distributions resulting from various magnetic sources placed close to thecell. The slow diffusion of Cs atoms in the presence of a nitrogen (N$_{2}$)buffer gas enables spatially independent measurements to be made within thesame vapor cell by translating a $175\,\mu$m probe beam over the sensing area.For example, the OPM was used to record temporal and spatial information toreconstruct magnetic field distributions in one and two dimensions. The optimalmagnetometer sensitivity was estimated to be 0.43$\,\mathrm{pT/\sqrt{Hz}}$within a Nyquist limited bandwidth of $500\,$Hz. Furthermore, the sensor'sdynamic range exceeds the Earth's field of approximately $50\,\mu$T, whichprovides a framework for magnetic field imaging in unshielded environments.

Free-induction-decay magnetic field imaging with a microfabricated Cs vapor cell