Abstract
Abstract The main assumptions of thermal and plasma models of pulsed heating are discussed. With the effective time of energy dissipation of the electron-hole plasma in a crystal of ∼10 −8 s and in an amorphous phase of ∼10 −10 s for pulses longer than 10 −8 s, phase and structural transformations are described on the basis of a heat conduction equation. The participation of plasma processes (formation of electron-hole pairs and their recombination) is conditioned by delay of the plasma relaxation by structural defects and continuous formation of plasma and ionized atoms in the process of pulse action. It is possible to observe acceleration of diffusion processes and crystallization both in the field of mechanical stresses and in the electric field, photostimulation and weakening of atomic bonds in the plasma field. A possibility of kinetic overheating of a crystal without melting above T m has been demonstrated. The results of simulation of the crystallization by a thermal model within the pulse duration of 1 ps-10 s are presented. Agreement between theory and experiment is discussed.
Published Version
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