Abstract
In this study, we use pump-probe microscopy to examine the melting and solidification dynamics of silicon during and after a UV laser pulse with a duration of $$30\,\hbox {ns}$$ . Below the ablation threshold, we observe lateral melt front contraction velocities of up to $$600\,\hbox {ms}^{-1}$$ . The peak velocities spatially coincide with a ring of lower crystallinity within the formerly molten area, as we show with spatially resolved Raman spectroscopy.
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