Abstract
Well-aligned crystallites of dimensions up to 2–3 × 100 μ m have been obtained by scanning amorphous Ge films on fusedsilica substrates with the slit image of a cw Nd:YAG laser. A theoretical model has been developed for the dynamics of the crystallization process, a solid-phase transformation that is greatly accelerated by liberation of the latent heat of transformation, resulting in either periodic or runaway motion of the crystallization front. The model explains many of the qualitative features of the experiments and yields a semiquantitative fit of the dependence of period on temperature.
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