(2405.08696) Demonstration of magnetically silent optically pumped magnetometers for the TUCAN electric dipole moment experiment

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Abstract:We report the performance of a magnetically silent, optically pumped cesium magnetometer with a statistical sensitivity of 3.5 pT/rtHz at 1~Hz and a stability of 90 fT over 150 seconds of measurement. Optical pumping with coherent, linearly polarized, resonant light leads to a relatively long polarized ground state of cesium vapor contained in a measuring cell. The state precedes at its Larmor frequency in the magnetic field to be measured. Nonlinear magneto-optical rotation then leads to rotation of the polarization plane of a linearly polarized probe laser beam. The rotation angle is modulated at twice the Larmor frequency. A measurement of this frequency constitutes an absolute measure of the magnetic field amplitude. Featuring purely optical operation, non-magnetic construction, low noise, and high stability, this sensor will be used for the upcoming TUCAN electric dipole moment experiment and other highly sensitive magnetic applications. Innovative aspects of the system include commercial construction and the ability to operate up to 24 sensors on a single probe laser diode.