HEAT SUPEREMISSION AND NUCLEATION-FRONT PROPAGATION UNDER LASER-INDUCED CRYSTALLIZATION OF THIN AMORPHOUS FILMS

The laser-induced solid-state explosive nucleation in amorphous media is studied analytically. The shapes of the temperature switching wave and that of the nucleation front as well as the formula for the front velocity are derived considering also self-consistent medium deformati on. Two conditions of explosive nucleation reflecting the roles of lat ent heat emission and of deformation are formulated. It is shown that, in explosive nucleation, the rate of internal heat emission is propor tional to the square of the latent crystallization heat (''superemissi on'') in analogy to photon supeffadiance in initially inverted two-lev el atomic systems.