Abstract
Numerical modeling is used to investigate the physical mechanisms of the interaction of ultra-short (sub-picosecond) laser pulses with metallic targets. The laser–target interaction is modeled by using a one-dimensional hydrodynamic code that includes the absorption of laser radiation, the electronic heat conduction, the electron-phonon or electron–ion energy exchange, as well as a realistic equation of state. Laser fluences typical for micromachining are considered. The results of the 1D modeling are then used as the initial conditions for a 2D plasma expansion model. The dynamics of laser plume expansion in femtosecond regime is investigated. Calculations show that the plasma plume is strongly forward directed. In addition, a two-peaked axial density profile is obtained for 400 nm laser wavelength. The calculation results agree with the experimental observations.
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52.38.Mf; 02.60.Cb
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Itina, T., Vidal, F., Delaporte, P. et al. Numerical study of ultra-short laser ablation of metals and of laser plume dynamics. Appl. Phys. A 79, 1089–1092 (2004). https://doi.org/10.1007/s00339-004-2647-5
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DOI: https://doi.org/10.1007/s00339-004-2647-5