An optically-modulated zero-field atomic magnetometer with suppressed spin-exchange broadening
Ricardo Jimenez Martinez, Svenja A. Knappe, John E. Kitching
We implement an optically-pumped 87Rb magnetometer based on a zero-field dispersive resonance enabled by the optical modulation of the 87Rb ground state energy levels. The magnetometer is operated in the spin-exchange relaxation-free regime where high magnetic field sensitivities can be achieved. Contrary to previous magnetometers that use a radio-frequency magnetic field to generate the zero-field dispersive resonance the device presented here does not need an intrinsic radio-frequency field to generate its signal. Such device can be used in applications requiring array-based magnetometers where radio frequency magnetic fields can induce cross-talk among the sensors or affect the source of the magnetic field being measured.