Metals (Oct 2023)

Thermal Lattice Field during Ultra-Short Laser Pulse Irradiation of Metal Targets: A Fokker–Planck Analytical Model

  • Sinziana-Andreea Anghel,
  • Mihai Oane,
  • Cristian N. Mihăilescu,
  • Bogdan A. Sava,
  • Mihail Elişa,
  • Natalia Mihăilescu,
  • Dorina Ticoş,
  • Alexandra M. I. Trefilov,
  • Carmen Ristoscu,
  • Ana V. Filip,
  • Ion N. Mihăilescu

DOI
https://doi.org/10.3390/met13101775
Journal volume & issue
Vol. 13, no. 10
p. 1775

Abstract

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The ultrafast fs laser pulse heating of thin metal films is studied for the first time using the two-temperature model on the basis of the Fokker–Planck formalism. The incident laser radiation is multi-modal, while the electron temperature is described during the first 2 fs. The predictions are intended for use by experimentalists in optoelectronics, photonics, laser processing, electronics, and bio- and nanomedicine. The crucial role of the nano-sized spatial dimensions of the metal sample is highlighted. A significant result of this study is the interdependence between the target’s size, the phonon/lattice characteristics, and the coefficient β (the quotient of non-diffusive phenomena), which varies between zero (pure diffusive case) and one (pure non-diffusive case).

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