Abstract
Experimental results of femtosecond laser ablation of the metals copper, silver and tungsten are compared to simulations based on the two-temperature model. The comparison provides new information about the laser-heating process: For the noble metals (Cu, Ag), the energy transport via ballistic electrons must be included, while this effect is negligible for a transition metal (W). The comparison provides values for the range of ballistic electrons in the noble metals. The model calculation is also employed to investigate the dependence of the threshold fluence and melting depth on pulse duration. It is observed that for pulses shorter than approximately 1 ps the threshold fluence and melting depth are independent of the pulse duration, while they increase as τ 0.47 and τ 0.51, respectively, for pulses longer than ∼40 ps, in good agreement with approximate analytical expressions predicting a \(\sqrt{\tau}\) dependence.
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Byskov-Nielsen, J., Savolainen, JM., Christensen, M.S. et al. Ultra-short pulse laser ablation of copper, silver and tungsten: experimental data and two-temperature model simulations. Appl. Phys. A 103, 447–453 (2011). https://doi.org/10.1007/s00339-011-6363-7
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DOI: https://doi.org/10.1007/s00339-011-6363-7