All-optical nonzero-field vector magnetometer using orthogonal detecting beams achieves estimated 16 fT/Hz^{1/2} scalar sensitivity and demonstrated 4x10^{-7} rad angular sensitivity in an 8 mm cell.
Zhang et al., Recording Brain Activities in Unshielded Earth’s Field with Optically Pumped Atomic Magnetometers , Science Advances 6, eaba8792 (2020)
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All-Optical Nonzero-Field Vector Magnetic Sensor For Magnetoencephalography
All-optical nonzero-field vector magnetometer using orthogonal detecting beams achieves estimated 16 fT/Hz^{1/2} scalar sensitivity and demonstrated 4x10^{-7} rad angular sensitivity in an 8 mm cell.