Unshielded three-axis vector operation of a spin-exchange-relaxation-free atomic magnetometer

Seltzer, S. J.; Romalis, M. V.
November 2004
Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4804
Academic Journal
We describe a vector alkali-metal magnetometer that simultaneously and independently measures all three components of the magnetic field. Using a feedback system, the total field at the location of the magnetometer is kept near zero, suppressing the broadening due to spin-exchange collisions. The resonance linewidth and signal strength of the magnetometer compare favorably with two different scalar operation modes in which spin-exchange relaxation is only partially suppressed. Magnetic field sensitivity on the order of 1 pT/ √Hz is demonstrated in a laboratory environment without magnetic shields.


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