  Novel nonlinear optical phenomena - photonic flame effect (PFE) and
stimulated globular scattering (SGS) are discussed.PFE consisted in the
appearance of the few seconds duration emission in blue-green spectral range
under 20 ns ruby laser pulse excitation and simultaneous excitation of several
spatially separated synthetic opal crystalls situated on the Cu plate. SGS was
observed both in forward and backward directions. Spectral and energetical SGS
characteristics were measured.
