Abstract

We demonstrate coherent storage and retrieval of pulsed light using the atomic frequency comb protocol in a room temperature alkali vapor. We utilize velocity-selective optical pumping to prepare multiple velocity classes in the $F = 4$ hyperfine ground state of cesium. The frequency spacing of the classes is chosen to coincide with the $F^\prime = 4 - F^\prime = 5$ hyperfine splitting of the ${6^2}{{\rm P}_{3/2}}$ excited state, resulting in a broadband periodic absorbing structure consisting of two usually Doppler-broadened optical transitions. Weak coherent states of duration $2\;{\rm ns} $ are mapped into this atomic frequency comb with pre-programmed recall times of $8\;{\rm ns} $ and $12\;{\rm ns} $, with multi-temporal mode storage and recall demonstrated. Utilizing two transitions in the comb leads to an additional interference effect upon rephasing that enhances the recall efficiency.

© 2021 Optical Society of America

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