We present the direct measurements of electric-dipole moments for 5P 3/2 → nD 5/2 transitions with 20 < n < 48 for Rubidium atoms. The measurements were performed in an ultracold sample via observation of the Autler-Townes splitting in a three-level ladder scheme, commonly used for 2-photon excitation of Rydberg states. To the best of our knowledge, this is the first systematic measurement of the electric dipole moments for transitions from low excited states of rubidium to Rydberg states. Due to its simplicity and versatility, this method can be easily extended to other transitions and other atomic species with little constraints. Good agreement of the experimental results with theory proves the reliability of the measurement method.

Highlights We have built and tested an Optically Pumped Magnetometer based on non-linear magnetooptical rotation. We present a new approach to OPM- based MEG using a modular NOPM sensor. Our sensor is resilient to non-zero and non-uniform magnetic field environments and crosstalk free. We demonstrate the operation of the NOPM sensor by measuring auditory response and calculating time-frequency representation of power.

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No abstract