Spin-exchange relaxation-free magnetometry using elliptically polarized light

V. Shah, M. V. Romalis

Research output: Contribution to journalArticlepeer-review

192 Scopus citations


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 7fT/ Hz with a miniature 5×5×5mmRb vapor cell.

Original languageEnglish (US)
Article number013416
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number1
StatePublished - Aug 6 2009

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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