• Sergey I. Kudryashov
  • Andrey A. Samokhvalov
  • Yaroslav D. Golubev
  • Dmitry S. Ivanov
  • Martin E. Garcia
  • Vadim P. Veiko
  • Baerbel Rethfeld
  • Vladimir Yu. Mikhailovskii
Double-pulse femtosecond laser ablation of thin aluminum films and bulk aluminum counterintuitively demonstrated a strong (60-70%) raise of the thickness-dependent thresholds for inter-pulse delays of 20-200 ps, preventing material removal at above-threshold fluencies. Time-resolved optical pump-probe reflection and double-pump transmission studies were performed and confirmed the variation of the ablation threhold depending on the interpulse delay. To support the experimental measurements, the process of double-pulse laser ablation was modelled with the combined atomistic-continuum model. The applied model can describe the laser-induced non-equilibrium phase transition processes at atomic precision, whereas the effect of free carriers, playing a determinant role for the case of ultrashort laser pulses, is accounted for in the continuum. The simulations revealed the underlying pre-ablative laser-induced stress dynamics in the hot, acoustically relaxed Al melt, crucially sensitive to the second pump-pulse compressive pressurization. The results of theoretical and experimental study enable efficient dynamic all-optical control of ultrafast laser ablation.
Original languageEnglish
Article number147940
Number of pages7
JournalApplied Surface Science
Volume537
Early online date23 Sep 2020
DOIs
StatePublished - 30 Jan 2021

    Research areas

  • thin films, double-pulse laser ablation, spallation, pump-probe, acoustic relaxation, two-temperature model, molecular dynamics simulations, all-optical control, All-optical control, Molecular dynamics simulations, Two-temperature model, Thin films, Double-pulse laser ablation, Pump-probe, Acoustic relaxation, Spallation, MOLECULAR-DYNAMICS, METAL TARGETS, SILICON, ALUMINUM, SPALLATION, LIQUIDS

    Scopus subject areas

  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces, Coatings and Films
  • Chemistry(all)
  • Surfaces and Interfaces

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