Spin-exchange relaxation-free magnetometry using elliptically polarized light
By Vishal Shah, M. Romalis. 2009
207 citations recorded by the source corpus.
Spin-exchange relaxation free alkali-metal magnetometers typically operate in the regime of high optical density, presenting challenges for simple and efficient optical pumping and detection. We describe a high-sensitivity Rb magnetometer using a single elliptically polarized off-resonant laser beam. Circular component of the light creates relatively uniform spin polarization while the linear component is used to measure optical rotation generated by the atoms. Modulation of the atomic spin direction with an oscillating magnetic field shifts the detected signal to high frequencies. Using a fiber-coupled distributed feedback laser, we achieve magnetic field sensitivity of $7\text{ }\text{fT}/\sqrt{\text{Hz}}$ with a miniature $5\ifmmode\times\else\texttimes\fi{}5\ifmmode\times\else\texttimes\fi{}5\text{ }\text{mm}\text{ }\text{Rb}$ vapor cell.
Subfields: Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/bb2af60182956b60492cf13ffed937e866acd6e7
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Citations in the corpus
- Optically pumped magnetometers: From quantum origins to multi-channel magnetoencephalography (2019, background): “This condition will be satisfied when γB1 ω which is often the case as making B1 large relative to ω runs the risk of increasing relaxation and reducing the sensitivity of the sensor (Shah and Romalis, 2009).”