Abstract
Thermal ablation of a metal surface by low-energy ultrashort laser pulses is considered theoretically. The temporal dynamics of the surface electron and lattice temperatures is studied within the framework of the two-temperature model and for different temperature dependences of the characteristics of the metal (electron-relaxation time, heat capacity, thermal conductivity). The approximation of evaporation into a vacuum is used to determine the ablation depth. Analytical expressions for the ablation-threshold fluenceF th as well as the threshold values of the lattice temperatureT th (F th) and the characteristics time of lattice temperature decayt d (F th) are obtained. This analytical description is in satisfatory agreement with particular numerical calculations.
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