Chinese Optics Letters, Vol. 3, Issue 1, 0157 (2005)
Femtosecond laser ablation of metals: a molecular dynamics simulation study
Xuan Liu1,2 and Yang Wang1,2
- 1Department of Mechanical &
- 2Automation, Harbin Institute of Technology, Harbin 150001
Using molecular dynamics (MD) methods combining with two-step radiation heating model, the mechanisms of ablation and the thermodynamic states at Ni surface under femtosecond laser irradiation are investigated. Simulation results show that the main mechanisms of ablation are evaporation and tensile stresses generated inside the target. The velocity of stress wave is predicted to be nearly equal to sound velocity. The rates of ablation at different fluences obtained from simulations are in good agreement with experimental data. Superheating phenomenon is also discovered.
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