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The rapid melting and resolidification of gold films irradiated by laser pulses less than 100 fs are investigated using the dual-hyperbolic two-step model. The solid–liquid interfacial velocity in the ultrafast phase change process is obtained by coupling a hyperbolic interfacial energy balance equation and nucleation dynamics. The results are compared with the experimental data for the 28-fs laser. The effects of laser pulse widths and fluences on melting process are investigated. A phase chart of the variations of pulse widths and fluences is established. The relationship between the melting threshold and ablation threshold is also presented.
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