  Dynamical coherent structure (pattern) formation in the Klein-Gordon lattice
excited by periodic external field near the optical resonance is studied. It is
shown that besides spatial patterns discovered recently (V.M.Burlakov,
Phys.Rev.Lett. 80, 3988 (1998)) the spatio-temporal patterns can be generated
in the lattice in rather broad region of excitation parameters. An influence of
cubic anharmonicity in the lattice potential and that of random noise on the
pattern formation is examined.

Pattern Formation and Solitons;Pattern Formation and Solitons