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

Wang, Xiaocui LU ; Jarnac, A. LU ; Ekström, J. C. LU ; Bengtsson, U.J. LU ; Dorchies, F.; Enquist, H. LU ; Jurgilaitis, A. LU ; Pedersen, M. N.; Tu, C. M. LU and Wulff, M., et al. (2019) In Structural Dynamics 6(2).
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... (More)

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.

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publication status
published
subject
in
Structural Dynamics
volume
6
issue
2
publisher
American Institute of Physics
external identifiers
  • scopus:85063025697
ISSN
2329-7778
DOI
10.1063/1.5089291
language
English
LU publication?
yes
id
2a6aa34d-4265-4fd7-b3c5-482e7f20ace1
date added to LUP
2019-03-28 12:30:46
date last changed
2019-04-23 04:47:24
@article{2a6aa34d-4265-4fd7-b3c5-482e7f20ace1,
  abstract     = {<p>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 &gt;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.</p>},
  articleno    = {024501},
  author       = {Wang, Xiaocui and Jarnac, A. and Ekström, J. C. and Bengtsson, U.J. and Dorchies, F. and Enquist, H. and Jurgilaitis, A. and Pedersen, M. N. and Tu, C. M. and Wulff, M. and Larsson, J.},
  issn         = {2329-7778},
  language     = {eng},
  number       = {2},
  publisher    = {American Institute of Physics},
  series       = {Structural Dynamics},
  title        = {Generation of a large compressive strain wave in graphite by ultrashort-pulse laser irradiation},
  url          = {http://dx.doi.org/10.1063/1.5089291},
  volume       = {6},
  year         = {2019},
}