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Simulation of ultrashort double pulse laser ablation of metals

M. POVARNITSYN1,* , K. KHISHCHENKO1, P. LEVASHOV1, A. ZAKHARENKOV1, J. HERMANN2, S. DE FALCO2, T. ITINA3

Affiliation

  1. Joint Institute for High Temperatures of RAS, Izhorskaya 13 bldg 2, 125412 Moscow, Russia
  2. LP3 - UMR6182 CNRS, 163, Avenue de luminy - C. 917, 13288, Marseille cedex 9, France
  3. Laboratoire Hubert Curien, UMR CNRS 5516, 18 rue Benoît Lauras, Bât. F, 42000, St-Etienne, France

Abstract

We perform a hydrodynamic simulation of laser ablation of metals to explain the results of recent experiments with subpicosecond double pulses (2  2 J/cm2 ). In the experiments, the time delay del between the pulses varies from 0.1 ps to 200 ps. When the delay is much shorter than the electron-ion relaxation time ei (delay << ei) the crater depth is the same as for a single pulse of energy 4 J/cm2 . For the intermediate delays (delay ~ ei) the crater depth monotonically drops. For the long delay delay >> ei the crater depth corresponds to that obtained with a single pulse. The results of the hydrodynamic two-temperature simulations performed with realistic absorption and multiphase equation of state explain the observed behavior..

Keywords

Laser ablation, Femtosecond, Double pulse, Hydrodynamic model.

Submitted at: June 30, 2009
Accepted at: Feb. 27, 2010

Citation

M. POVARNITSYN, K. KHISHCHENKO, P. LEVASHOV, A. ZAKHARENKOV, J. HERMANN, S. DE FALCO, T. ITINA, Simulation of ultrashort double pulse laser ablation of metals, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 3, pp. 674-676 (2010)