Abstract
The results of theoretical studies are reported for threshold characteristics of a metal ablation by ultrashort laser pulses. Two possible mechanisms of the laser ablation at laser fluence <i>F</i>≥F<sub>th</sub> are considered: thermal mechanism of ablation connected with a kinetics of a metal-vacuum surface evaporation and mechanism of ablation connected with a hydrodynamics of a dense matter. The analysis has been made within the framework of a two-temperature model of metals for two region of laser pulse duration-femtosecond and picosecond, and the extended of a two-temperature model of the metal. Analytical expressions for the ablation-threshold fluency <i>F</i><sub>th</sub> as well as the threshold values of the lattice time temperature T<sub>th</sub>(F<sub>th</sub>) are obtained.
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