Effect of Spatial Homogeneity of Spin Polarization on Magnetic Field Response of an Optically Pumped Atomic Magnetometer Using a Hybrid Cell of K and Rb Atoms

Yosuke Ito, Hiroyuki Ohnishi, Keigo Kamada +1 more

IEEE Transactions on MagneticsOct 18, 201227 citations

Bulletin of the American Physical Society

Improved Modeling of D1 Optical Pumping of Optically Thick Rb and K-Rb vapors

Brian Lancor, Zack DeLand, Thad G Walker

Published Jun 4, 2013• 0 citations

OpenAlex

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Effect of Spatial Homogeneity of Spin Polarization on Magnetic Field Response of an Optically Pumped Atomic Magnetometer Using a Hybrid Cell of K and Rb Atoms

Yosuke Ito, Hiroyuki Ohnishi, Keigo Kamada +1 more

We measured the spatial homogeneity of spin polarization, which is directly related to the sensitivity and magnetic linewidth of an optically pumped atomic magnetometer with a hybrid cell of K and Rb atoms. This was done by changing the position of the probe beam. Furthermore, for comparison, we also measured the sensitivity and magnetic linewidth of atomic magnetometers with single K and single Rb cells, and found that optically thick atoms were spin polarized homogeneously with the hybrid cell. Optically thin alkali metal vapor can be spin polarized homogeneously, and the spin polarization transfers to an optically thick alkali metal vapor. An atomic magnetometer with the hybrid cell was found to be more effective in realizing simultaneous signal measurements at different locations with the uniform sensitivity and magnetic linewidth.We measured the spatial homogeneity of spin polarization, which is directly related to the sensitivity and magnetic linewidth of an optically pumped atomic magnetometer with a hybrid cell of K and Rb atoms. This was done by changing the position of the probe beam. Furthermore, for comparison, we also measured the sensitivity and magnetic linewidth of atomic magnetometers with single K and single Rb cells, and found that optically thick atoms were spin polarized homogeneously with the hybrid cell. Optically thin alkali metal vapor can be spin polarized homogeneously, and the spin polarization transfers to an optically thick alkali metal vapor. An atomic magnetometer with the hybrid cell was found to be more effective in realizing simultaneous signal measurements at different locations with the uniform sensitivity and magnetic linewidth.

IEEE Transactions on MagneticsOct 18, 201227 citations

We present measurements of the circular dichroism of optically pumped Rb vapor near the

{D}_{1}

resonance line. Collisions with the buffer gases

^{3}\mathrm{He}

and

{\mathrm{N}}_{2}

reduce the transparency of the vapor, even when fully polarized. We use two methods to measure this effect, show that the He results can be understood from RbHe potential curves, and show how this effect conspires with the spectral profile of the optical pumping light to increase the laser power demands for optical pumping of very optically thick samples.