  The interaction of an atom with an electromagnetic field is discussed in the
presence of a time periodic external modulating force. It is explained that a
control on atom by electromagnetic fields helps to design the quantum analog of
classical optical systems. In these atom optical systems chaos may appear at
the onset of external fields. The classical and quantum chaotic dynamics is
discussed, in particular in an atom optics Fermi accelerator. It is found that
the quantum dynamics exhibits dynamical localization and quantum recurrences.
