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Optics Communications

Nondegenerate four-wave mixing in a Zeeman degenerate three-level system of cold cesium

S. Barreiro, J. W. R. Tabosa

Published Feb 10, 2004• 3 citations
Publisher
DOI
10.1016/j.optcom.2004.01.066

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Summary form only given. The demonstration of electromagnetically induced transparency (EIT) on an atomic transition along with its potential possibilities of applications has driven a much deeper investigation on the atom-field interaction, specifically concerning to the level degeneracy. This coherent response of an atomic system can also be studied through four-wave mixing (FWM), a process named electromagnetically induced grating (EIG) which present the advantage of being a background free technique. In this work we present results on the observation of subnatural EIG resonance in a degenerate open two-level system where the Zeeman degeneracy plays a important role. The experiment is performed in cold cesium atoms obtained from a MOT and employs the conventional backwards FWM configuration.
We report on the generation of light carrying orbital angular momentum through Bragg diffraction into an electromagnetically induced coherence grating in a degenerate two-level system of cold cesium atoms, demonstrating the c onservation the c onservation of orbital angular momentum of light in a coherent four-wave mixing process. The induced Zeeman coherence grating is shown to contain the spatial phase structure of the incident beams. The e xchange of phase information between a light beam with orbital angular momentum and a long-lived atomic coherence opens up the way to process quantum process information encoded in a multidimensional state space.