  We report on the storage of Orbital Angular Momentum (OAM) of light via the
phenomenon of Coherent Population Oscillation (CPO) in cold cesium atoms. The
experiment is performed using a delayed four wave mixing configuration where
the transverse optical information of a probe field carrying OAM associated
with its azimuthal phase dependence is stored in the CPO of Zeeman sublevels of
the hyperfine transition $F=3\rightarrow F^{\prime}=2$ of cesium $D_{2}$ line.
We also demonstrate experimentally the simultaneous storage and retrieval of
different OAM states propagating along different directions in space, leading
to algebric operations with OAM and therefore opening the possibility of
multiplexing OAM states.
