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Proceedings Paper

Applications of highly oriented pyrolytic graphite (HOPG) for x-ray diagnostics and spectroscopy
Author(s): Herbert Legall; Holger Stiel; Peter-Victor Nickles; Aniouar A. Bjeoumikhov; Norbert Langhoff; Michael Haschke; Vladimir A. Arkadiev; Reiner Wedell
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Paper Abstract

Thin films of highly oriented pyrolytic graphite (HOPG) give the opportunity to realize crystal optics with arbitrary geometry by mounting it on a mould of any shape. A specific feature of a HOPG is its mosaicity accompanied by mosaic focusing and high integral reflectivity. These characteristics are of interest for compact x-ray diagnostic tools and spectrometers. Another interesting feature is, due to the mosaic spread of the HOPG crystals, that it is possible also with a beam of low divergence to record a spectrum in a broad energy range even within one laser shot. That means that the HOPG spectrometer can act as a polychromator. The latter feature is important if irreversible changes in samples should be investigated or, e.g., if in time-resolved pump-probe experiments a spectrum should be recorded before sample degradation takes place due to high pump intensities. Different design considerations for a compact HOPG-spectrometer based on experimental and theoretical studies will be presented. For applications in plasma diagnostics and XAFS (x-ray absorption fine structure) the attainable energy resolution plays a central role and has been intensively investigated. The results of our investigations demonstrate that HOPG can be used as powerful optics for x-ray diagnostics as well as for x-ray absorption and emission spectroscopy.

Paper Details

Date Published: 31 August 2005
PDF: 11 pages
Proc. SPIE 5918, Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II, 591802 (31 August 2005); doi: 10.1117/12.614847
Show Author Affiliations
Herbert Legall, Max-Born-Institut (Germany)
Holger Stiel, Max-Born-Institut (Germany)
Peter-Victor Nickles, Max-Born-Institut (Germany)
Aniouar A. Bjeoumikhov, Institute for Scientific Instruments GmbH (Germany)
Norbert Langhoff, Institute for Scientific Instruments GmbH (Germany)
Michael Haschke, Institute for Scientific Instruments GmbH (Germany)
Vladimir A. Arkadiev, Institut fuer angewandte Photonik e.V. (Germany)
Reiner Wedell, Institut fuer angewandte Photonik e.V. (Germany)


Published in SPIE Proceedings Vol. 5918:
Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II
George A. Kyrala; Jean-Claude J. Gauthier; Carolyn A. MacDonald; Ali M. Khounsary, Editor(s)

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