  We report on the storage of light via the phenomenon of Coherent Population
Oscillation (CPO) in an atomic cesium vapor at room temperature. In the
experiment the optical information of a probe field is stored in the CPO of two
ground states of a Lambda three-level system formed by the Zeeman sublevels of
the hyperfine transition F = 3 - F' = 2 of cesium D2 line. We show directly
that this CPO based memory is very insensitive to stray magnetic field
inhomogeneities and presents a lifetime which is mainly limited only by atomic
motion. A theoretical simulation of the measured spectra was also developed and
is in very good agreement with the experiment.
