Laser and Particle Beams

Research Article

Non-equilibrium two-dimensional thermal evolutions in target materials irradiated by femtosecond laser pulse

G. Al-Malkawia1 c1 and A. Hassaneina1

a1 Center for Materials under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, Indiana

Abstract

Non-equilibrium heat transfer described by a two-step temperature model was developed to study the thermal evolution through target materials irradiated by femtosecond laser pulse. Two-dimensional heat transfer equations were solved numerically. The temperature dependent thermo-physical properties of the electron and the lattice are considered in the model. The Gaussian spatial and temporal distribution of the heat and temperature of the electron and the lattice is presented. The effect of reflectivity, electron — lattice coupling factor, and the spot size was studied using copper targets.

(Received July 09 2013)

(Accepted September 17 2013)

Keywords

  • Coupling factor;
  • Femtosecond laser;
  • Spot size;
  • Two temperature model;
  • Ultrashort

Correspondence

c1 Address correspondence and reprint requests to: G. Al-Malkawi, Center for Materials under Extreme Environment, School of Nuclear Engineering, Purdue University, West Lafayette, IN 47907. E-mail: galmalka@purdue.edu