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Appl. Sci. 2018, 8(10), 1728; https://doi.org/10.3390/app8101728

Hard X-ray Generation from ZnO Nanowire Targets in a Non-Relativistic Regime of Laser-Solid Interactions

1
Institute of Optics and Quantum Electronics, Friedrich Schiller University, Jena, Max Wien Platz 1, 07743 Jena, Germany
2
Helmholtz Institute Jena, Fröbelstieg 3, 07743 Jena, Germany
3
Abbe Center of Photonics, Friedrich Schiller University, Jena, Albert Einstein Straße 6, 07745 Jena, Germany
4
Institute of Solid State Physics, Friedrich Schiller University, Jena, Helmholtzweg 3, 07743 Jena, Germany
5
GSI Helmholtz Centre for Heavy Ion Research, Planckstraße 1, 64220 Darmstadt, Germany
6
Goethe University, Institute of Applied Physics, Max von Laue Straße 1, 60438 Frankfurt am Main, Germany
*
Author to whom correspondence should be addressed.
Received: 29 August 2018 / Revised: 16 September 2018 / Accepted: 21 September 2018 / Published: 25 September 2018
(This article belongs to the Special Issue Diagnostic Techniques for Laser-plasma Experiments)
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Abstract

We present a detailed investigation of X-ray emission from both flat and nanowire zinc oxide targets irradiated by 60 fs 5 × 1016 W/cm2 intensity laser pulses at a 0.8 µm wavelength. It is shown that the fluence of the emitted hard X-ray radiation in the spectral range 150–800 keV is enhanced by at least one order of magnitude for nanowire targets compared to the emission from a flat surface, whereas the characteristic Kα line emission (8.64 keV) is insensitive to the target morphology. Furthermore, we provide evidence for a dramatic increase of the fast electron flux from the front side of the nanostructured targets. We suggest that targets with nanowire morphology may advance development of compact ultrafast X-ray sources with an enhanced flux of hard X-ray emission that could find wide applications in highenergy density (HED) physics. View Full-Text
Keywords: X-ray generation; laser-matter interaction; ultrashort laser pulses; X-ray spectroscopy; laser plasma emission; nanostructured arrays X-ray generation; laser-matter interaction; ultrashort laser pulses; X-ray spectroscopy; laser plasma emission; nanostructured arrays
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Samsonova, Z.; Höfer, S.; Hollinger, R.; Kämpfer, T.; Uschmann, I.; Röder, R.; Trefflich, L.; Rosmej, O.; Förster, E.; Ronning, C.; Kartashov, D.; Spielmann, C. Hard X-ray Generation from ZnO Nanowire Targets in a Non-Relativistic Regime of Laser-Solid Interactions. Appl. Sci. 2018, 8, 1728.

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