• 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.
Язык оригиналаанглийский
Номер статьи147940
Число страниц7
ЖурналApplied Surface Science
Том537
Дата раннего онлайн-доступа23 сен 2020
DOI
СостояниеОпубликовано - 30 янв 2021

    Области исследований

  • thin films, double-pulse laser ablation, spallation, pump-probe, acoustic relaxation, two-temperature model, molecular dynamics simulations, all-optical control

    Предметные области Scopus

  • Физика конденсатов
  • Физика и астрономия (все)
  • Поверхности, слои и пленки
  • Химия (все)
  • Поверхности и интерфейсы

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