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Atomic magnetometers have very high absolute precision and sensitivity tomagnetic fields but suffer from a fundamental problem: the vectorial ortensorial interaction of light with atoms leads to "dead zones", certainorientations of magnetic field where the magnetometer loses its sensitivity. Wedemonstrate a simple polarization modulation scheme that simultaneously createscoherent population trapping (CPT) in orientation and alignment, therebyeliminating dead zones. Using $^{87}$Rb in a 10 Torr buffer gas cell we measurenarrow, high-contrast CPT transparency peaks in all orientations and also showabsence of systematic effects associated with non-linear Zeeman splitting.

Isotropic magnetometry with simultaneous excitation of orientation and alignment CPT resonances