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In this work we demonstrate a high sensitivity atomic gradiometer capable ofoperation in earth-field level environments. We apply a light-pulse sequence atfour times the Larmor frequency to achieve gradiometer sensitivity <20fT/cm/$\sqrt{\rm Hz}$ at the finite field strength of 22 $\mu$T. Theexperimental timing sequence can be tuned to the field magnitude of interest.Our one dimensional all-optical gradiometer performs a differential measurementbetween two regions of a single vapor cell on a 4 cm baseline. Our results pavethe way for extensions to operation in higher dimensions, vector sensitivity,and more advanced gradiometers.

An all-optical intrinsic atomic gradiometer with sub-20 fT/cm/$\sqrt{\rm Hz}$ sensitivity in a 22 $\mu$T earth-scale magnetic field