Simulation of ultrashort double pulse laser ablation of metals

M. E. Povarnitsyn (1) , K. V. Khishchenko , Pavel Levashov , A. Zakharenkov , Jörg Hermann (1) , Sylvie de Falco , Tatiana Itina (2)

1 LP3 - Laboratoire Lasers, Plasmas et Procédés photoniques
2 LHC - Laboratoire Hubert Curien

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

Domains: Chemical and Process Engineering

M. E. Povarnitsyn, K. V. Khishchenko, Pavel Levashov, A. Zakharenkov, Jörg Hermann, et al.. Simulation of ultrashort double pulse laser ablation of metals. Journal of Optoelectronics and Advanced Materials, 2010, 12 (3), pp.674-676. ⟨ujm-00472026⟩