  We perform Raman spectroscopy of optically trapped non interacting \Rb atoms,
and observe revivals of the atomic coherence at integer multiples of the trap
period. The effect of coherence control methods such as echo and dynamical
decoupling is investigated experimentally, analytically and numerically, along
with the effect of the anharmonicity of the trapping potential. The latter is
shown to be responsible for incompleteness of the revivals. Coherent Raman
control of trapped atoms can be useful in the context of free-oscillation atom
intefrerometry and spatial multi-mode quantum memory.
