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Frontiers in Optics

Significant Enhancement of Magneto-Optical Rotation in a Low-Light Resonant Tripod System

E. Y. Zhu, Feng Lei Zhou, E. W. Hagley, Lu Deng

Published Jan 1, 2017• 0 citations
Publisher

Abstract

The magneto-optical rotation experienced by a resonant probe field in an ambient-temperature atomic vapor is enhanced more than ten-fold when a secondary low-intensity optical field is introduced, forming an atomic tripod system.
DOI
10.1364/fio.2017.jtu3a.50

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Nonlinear resonances in alkali metal vapor, which are detected by the magneto-optical rotation of the linear polarization of light, are actively used in quantum magnetometry to fabricate atomic magnetometers. The magneto-optical rotation in most such sensors is due to magnetic birefringence, and rotation angles usually do not exceed tens of milliradians. In this work, an experiment where magneto-optical resonances of linear polarization rotation of a probe wave are due to strong dichroism induced in a medium by a counterpropagating pump wave has been proposed. Both waves are in resonance with the Fg = 2 → Fe = 1 optical transition in the 87Rb D1 line (λ ≈ 795 nm). Experiments have been carried out with a 2-cm-long cylindrical cell filled with a buffer gas, and the maximum rotation angle is ≈390 mrad (22°) at a width of resonance of about 300 nT. The results show that the configuration proposed for the observation of magneto-optical rotation is promising for the fabrication of compact high-sensitivity atomic magnetometers.
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