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We report on the storage of orbital angular momentum (OAM) of light of a Laguerre–Gaussian mode in an ensemble of cold cesium atoms and its retrieval along an axis different from the incident light beam. We employed a time-delayed four-wave mixing (FWM) configuration to demonstrate that at small angle (2°), after storage, the retrieved beam carries the same OAM as the one encoded in the input beam...
A special vapour cell has been built, that allows the measurement of the atom–surface van der Waals interaction exerted by a CaF2 window at the interface with Cs vapour. Mechanical and thermal fragility of fluoride windows make common designs of vapour cells impractical, so that we have developed an all-sapphire sealed cell with an internal CaF2 window. Although some impurities have remained when...
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