A Low-Noise High-Density Alkali Metal Scalar Magnetometer

Details A Low-Noise High-Density Alkali Metal Scalar Magnetometer A Low-Noise High-Density Alkali Metal Scalar Magnetometer

2006-11-08

arxiv.org/abs/physics/0611085v2

Physics

Atomic and Molecular Clusters

10 pages, 7 figures. Version 2 is longer, with more complete description of theoretical analysis and comparison between analyt

Scientific paper

We present an experimental and theoretical study of a scalar atomic magnetometer using an oscillating field-driven Zeeman resonance in a high-density optically-pumped potassium vapor. We describe an experimental implementation of an atomic gradiometer with a noise level below 10 fT/Hz^{1/2}, fractional field sensitivity below 10^{-9}/Hz^{1/2}, and an active measurement volume of about 1.5 cm^3. We show that the fundamental field sensitivity of a scalar magnetometer is determined by the rate of alkali-metal spin-exchange collisions even though the resonance linewidth can be made much smaller than the spin-exchange rate by pumping most atoms into a stretched spin state.

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