Imaging Microwave and DC Magnetic Fields in a Vapor-Cell Rb Atomic Clock


We have a tendency to report on the experimental measurement of the dc and microwave magnetic field distributions within a recently developed compact magnetron-type microwave cavity mounted inside the physics package of a high-performance vapor-cell atomic frequency standard. Pictures of the microwave field distribution with sub-100- lateral spatial resolution are obtained by pulsed optical-microwave Rabi measurements, using the Rb atoms inside the cell as field probes and detecting with a CCD camera. Asymmetries observed in the microwave field images can be attributed to the precise practical realization of the cavity and therefore the Rb vapor cell. Similar spatially resolved images of the dc magnetic field distribution are obtained by Ramsey-sort measurements. The relaxation time in the Rb vapor cell is found to be position dependent and correlates with the gradient of the dc magnetic field. The presented technique is very helpful for experimental in situ characterization of dc magnetic fields and resonant microwave structures, for atomic clocks or alternative atom-based mostly sensors and instrumentation.

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