Stimulated globular scattering and photonic flame effect: new nonlinear   optics phenomena
  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. 
A.Esakov, V.Gorelik, A.Kudryavtseva, N.Tcherniega