Author Affiliations
1 Departamento de Física Teórica Atómica y Óptica, Universidad de Valladolid, Valladolid, Spain
2 Université de Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications (CELIA), UMR 5107, Talence, France
3 European XFEL GmbH, Schenefeld, Germany
4 Laboratory for Laser Energetics, Rochester, New York, USA
5 CEA-DAM, DIF, Arpajon, France
6 University of Michigan, Ann Arbor, Michigan, USA
7 Los Alamos National Laboratory, Los Alamos, New Mexico, USA
8 Lawrence Livermore National Laboratory, Livermore, California, USA
9 Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
10 Technische Universität Dresden, Dresden, Germany
11 Institute of Physics of the ASCR, Prague, Czech Republic
12 CEA-CESTA, CS 60001, Le Barp Cedex, France
13 Blackett Laboratory, Imperial College London, London, UK
14 Department of Astrophysics and Astronomy, The Johns Hopkins University, Baltimore, Maryland, USA
15 Center for Energy Research, University of California San Diego, San Diego, California, USA
Diagnosing the evolution of laser-generated high energy density (HED) systems is fundamental to develop a correct understanding of the behavior of matter under extreme conditions. Talbot–Lau interferometry constitutes a promising tool, since it permits simultaneous single-shot X-ray radiography and phase-contrast imaging of dense plasmas. We present the results of an experiment at OMEGA EP that aims to probe the ablation front of a laser-irradiated foil using a Talbot–Lau X-ray interferometer. A polystyrene (CH) foil was irradiated by a laser of 133 J, 1 ns and probed with 8 keV laser-produced backlighter radiation from Cu foils driven by a short-pulse laser (153 J, 11 ps). The ablation front interferograms were processed in combination with a set of reference images obtained ex situ using phase-stepping. We managed to obtain attenuation and phase-shift images of a laser-irradiated foil for electron densities above ${10}^{22}\;{\mathrm{cm}}^{-3}$ . These results showcase the capabilities of Talbot–Lau X-ray diagnostic methods to diagnose HED laser-generated plasmas through high-resolution imaging.
deflectometry OMEGA EP phase-contrast imaging Talbot–Lau X-ray interferometry 
High Power Laser Science and Engineering
2023, 11(4): 04000e49
Author Affiliations
1 Quantum Beam Science Directorate, Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizugawa, Kyoto 619-0215, Japan
2 Graduate School for the Creation of New Photonics Industries, Hamamatsu 431-1202, Japan
Ablation dynamics of tungsten irradiated with a 70 fs laser pulse is investigated with X-ray interferometry and X-ray imaging using a 13.9 nm soft X-ray laser of 7 ps pulse duration. The evolution of high-density ablation front of tungsten (i.e., W) is presented. The ablation front expands to 120 nm above the original target surface at 160 ps after femtosecond-laser irradiation with an expansion speed of approximately 750 m/s. These results will provide important data for understanding ablation properties of W, which is a candidate material of the first wall of magnetic confinement fusion reactors.
140.7240 UV, EUV, and X-ray lasers 350.3390 Laser materials processing 340.7440 X-ray imaging 340.7450 X-ray interferometry 
Chinese Optics Letters
2015, 13(7): 070002

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