Matter and Radiation at Extremes, Volume. 9, Issue 4, 047803(2024)
Demonstrating grating-based phase-contrast imaging of laser-driven shock waves
Fig. 1. Schematic of experimental setup for X-ray Talbot interferometry of laser-driven shock waves. A ps laser pulse is focused on a thin wire to produce X-rays that propagate through the target of interest, which has previously been irradiated with a ns laser beam. The Talbot interferometer, placed downstream of the target, is formed by the gratings G1 and G2. Finally, the X-rays are detected by a digital detector protected from electromagnetic pulses by a Faraday cage.
Fig. 2. Moiré fringe patterns obtained at PHELIX (a) and LULI (b). The color code is the same for both images and indicates the deposited X-ray energy in keV. The axis indicates the spatial extent in the object plane. Vertical red lines in the images mark the pixels from which the lineouts in (c) and (d) were generated. The fringe visibilities obtained at the PHELIX and LULI lasers were 15% ± 3% and 28% ± 3%, respectively. Note that the vertical stripes in the image obtained at PHELIX stem from defects in the absorption grating used.
Fig. 3. Retrieved transmission image (a) and differential phase-contrast image (b) from data acquired at the PHELIX laser. The 23
Fig. 4. Lineouts from the areas marked in red in
Fig. 5. Experimental results from the LULI beamtime: (a) transmission; (b) DPC; (c) dark-field image. The dark spot in the transmission image is a sapphire bead, which will not be discussed in this paper. The highly absorbing vertical area on the left side is a copper flag to shield the detector from preplasma emission.
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Leonard Wegert, Stephan Schreiner, Constantin Rauch, Bruno Albertazzi, Paulina Bleuel, Eric Fröjdh, Michel Koenig, Veronika Ludwig, Artem S. Martynenko, Pascal Meyer, Aldo Mozzanica, Michael Müller, Paul Neumayer, Markus Schneider, Angelos Triantafyllidis, Bernhard Zielbauer, Gisela Anton, Thilo Michel, Stefan Funk. Demonstrating grating-based phase-contrast imaging of laser-driven shock waves[J]. Matter and Radiation at Extremes, 2024, 9(4): 047803
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Received: Jan. 26, 2024
Accepted: May. 20, 2024
Published Online: Aug. 13, 2024
The Author Email: Wegert Leonard (L.Wegert@gsi.de)