Ultrafast short-range disordering of femtosecond-laser-heated warm dense aluminum

P. M. Leguay (1) , A. Levy (2) , B. Chimier (3) , F. Deneuville (4) , D. Descamps (3) , C. Fourment (3) , C. Goyon , S. Hulin , S. Petit (5) , O. Peyrusse (3) , J. J. Santos (3) , P. Combis (6) , B. Holst (7) , V. Recoules , P. Renaudin (8) , L. Videau , F. Dorchies (3)

1 EMT-INRS - Énergie Matériaux Télécommunications - INRS
2 LULI - Laboratoire pour l'utilisation des lasers intenses
3 CELIA - Centre d'Etudes Lasers Intenses et Applications
4 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
5 HydrASA - Hydrogéologie, Argiles, Sols, Altérations [E2 – IC2MP équipe 2]
6 DAM/DIF - DAM Île-de-France
7 UiB - Department of Physics and Technology [Bergen]
8 GEMAC - Groupe d'Etude de la Matière Condensée

We have probed, with time-resolved x-ray absorption near-edge spectroscopy (XANES), a femtosecond-laser-heated aluminum foil with fluences up to 1 J/cm2. The spectra reveal a loss of the short-range order in a few picoseconds. This time scale is compared with the electron-ion equilibration time, calculated with a two-temperature model. Hydrodynamic simulations shed light on complex features that affect the foil dynamics, including progressive density change from solid to liquid (∼10 ps). In this density range, quantum molecular dynamics simulations indicate that XANES is a relevant probe of the ionic temperature.

Domaines: Physique [physics]

P. M. Leguay, A. Levy, B. Chimier, F. Deneuville, D. Descamps, et al.. Ultrafast short-range disordering of femtosecond-laser-heated warm dense aluminum. Physical Review Letters, 2013, 111 (24), ⟨10.1103/PhysRevLett.111.245004⟩. ⟨hal-01561843⟩