Abstract

This paper presents a study of the process of superfast cooling from the melt, implemented when materials are being processed with ultrashort laser pulses. An analytical solution of the kinetic equation is found that describes the distribution function of the nucleation centers of the crystalline phase, depending on the number of atoms contained in them, on the assumption that a fairly large number of particles whose size exceeds a critical value exist at each specified instant of cooling, and that the nucleation centers are lamellar. Both conditions are satisfied in practice during rapid cooling from the melt. The mean size of the crystalline nucleation centers is computed, and the volume of the crystallized phase is determined. The critical cooling rate, at which the crystallization process is suppressed and an amorphous layer can be formed, is determined as a function of the parameters of the laser-operation regime and the thermodynamic characteristics of the material.

© 2008 Optical Society of America

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