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Lasers are becoming a more and more important tool in cutting and shapingmaterials. Improving precision and effectivity is an ongoing demand in scienceand industry. One possibility are double pulses. Here we study laser ablationof aluminum by the two-temperature model. There the laser is modeled as asource in a continuum heat conduction equation for the electrons, whosetemperature then is transferred to a molecular dynamics particle model by anelectron-phonon coupling term. The melting and ablation effectivity isinvestigated depending on the relative intensity and the time delay between twoGaussian shaped laser pulses. It turns out that at least for aluminum theoptimal pulse shapes are standard Gaussian pulses. For double pulses with delaytimes up to 200 ps we find a behavior as observed in experiment: the ablationdepth decreases beyond a delay of 10 ps even if one does not account for theweakening at the second pulse due to laser-plasma interaction.

Simulation of Laser Ablation in Aluminum: The Effectivity of Double Pulses