Generation of a large compressive strain wave in graphite by ultrashort-pulse laser irradiation

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

We have studied strain wave generation in graphite induced by an intense ultrashort laser pulse. The study was performed in the intensity regime above the ablation threshold of graphite. The aim was to maximize the strain and, thus, also the internal pressure (stress). Laser pulses with a 1 ps temporal duration melt the surface of graphite resulting in a molten material which initially exists at the solid density. As the molten material expands, a compressive strain wave starts propagating into the crystal below the molten layer. The strain pulse was studied with time-resolved X-ray diffraction. At a temporal delay of 100 ps after laser excitation, we observed >10% compressive strain, which corresponds to a pressure of 7.2 GPa. This strain could be reproduced by hydrodynamic simulations, which also provided a temperature map as a function of time and depth.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • European Synchrotron Radiation Facility
  • University of Bordeaux
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Atom- och molekylfysik och optik
Originalspråkengelska
Artikelnummer024501
TidskriftStructural Dynamics
Volym6
Utgivningsnummer2
StatusPublished - 2019
PublikationskategoriForskning
Peer review utfördJa

Relaterad forskningsoutput

Xiaocui Wang, 2019 maj 17, Department of Physics, Lund University. 145 s.

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

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