Abstract

The method is presented for converting a coherent population trapping (CPT) atomic clock into a CPT vector (compass-) magnetometer without mechanically moving parts through a relatively simple add-on. The system of 3D Helmholtz coils was used for compensation of the external magnetic field, allowing measurement of both strength and direction of a magnetic field at the sensitivity level of ${\rm{sub}}\! -\! {\rm{nT}}/{\rm{H}}{{\rm{z}}^{1/2}}$ within a 10-Hz bandwidth. Angular resolution of the developed vector magnetometer amounts to about ${{1}}{{{0}}^{- 2}}$ degrees.

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