Abstract
We present an experiment where a cloud of cold caesium atoms is dropped onto an atomic mirror formed by a laser evanescent wave, and is cooled during the reflection. This cooling is due to a single Sisyphus process, transferring atoms from one ground-state hyperfine level to another, less coupled to the evanescent wave. We compare our results with a simple one-dimensional theoretical model. We also give the first experimental evidence for a large increase in the confinement lifetime of the atoms in this ‘gravitational cavity’ because of the cooling process.
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