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

Research output: Contribution to journalArticle

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.

Details

Authors
Organisations
External organisations
  • European Synchrotron Radiation Facility
  • University of Bordeaux
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
Original languageEnglish
Article number024501
JournalStructural Dynamics
Volume6
Issue number2
Publication statusPublished - 2019
Publication categoryResearch
Peer-reviewedYes

Related research output

Xiaocui Wang, 2019 May 17, Department of Physics, Lund University. 145 p.

Research output: ThesisDoctoral Thesis (compilation)

View all (1)