  Cloning of arbitrary images encoded onto the spatial profile of a laser beam
onto that of a second beam is theoretically investigated. The two fields couple
to an atomic lambda system in a coherent population trapping configuration. In
particular, the case in which the probe and control fields are of comparable
strength is considered. By considering more and more complex structures, we
eventually find that our method is suitable to clone arbitrary images, which we
demonstrated by a full numerical simulation of the propagation dynamics of both
applied fields in the atomic medium, with the three letters "CPT" encoded on
the initial control field profile. We find that the cloned structures have
feature sizes reduced by about a factor of 2 compared to the initial images,
consistent with a recent related experiment.
