Abstract

We report the observation of a transient spectral feature in a dual-channel arrangement for electromagnetically induced transparency in a vacuum Rb vapor cell, which is caused by consecutive interactions of atoms with the two laser beams while their ground-state spin coherence are preserved. Despite a relatively small fraction of atoms that are participating in this process, their contribution to the overall line shape is not negligible and can be controlled by adjusting the relative phases between the optical fields in the two interaction regions. We also demonstrate that, thanks to the extended spin coherence evolution time, such differential intensity measurements can produce an error signal for the microwave frequency stabilization that is as strong as single-channel measurements. Additionally, the effective cancellation of the intensity noise, which dominates the single-channel detection, results in more than an order of magnitude higher signal-to-noise ratio.

© 2019 Optical Society of America

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