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Fabrication and efficiency measurement of a Mo/C/Si/C three material system multilayer Laue lens

 
: Kubec, Adam; Maser, Jörg M.; Formánek, Petr; Franke, Volker; Braun, Stefan; Gawlitza, Peter; Leson, Andreas; Macrander, Albert T.

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Applied Physics Letters 110 (2017), No.11, Art. 111905, 6 pp.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
English
Journal Article
Fraunhofer IWS ()
advanced photon source; efficiency measurement

Abstract
In this letter, we report on the manufacturing of a multilayer Laue lens (MLL) consisting of a multilayer stack with three materials: molybdenum and silicon as the absorber and spacer layer, respectively, and carbon as transition layers. The design has four layers per period: Mo/C/Si/C. It yields 6000 zones and provides an aperture of 50 μm. This allows the MLL structure to accept a large portion of the coherent part of the beam and to achieve a small spot size. The MLL deposition was made by magnetron sputtering at the Fraunhofer IWS, and the sectioning was done by laser cutting and subsequent focused ion beam milling to a thickness that provides a good efficiency for a photon energy of 12 keV. The diffraction efficiency as a function of the tilting angle has been measured at beamline 1-BM of the Advanced Photon Source. An efficiency of almost 40% has been achieved. This shows that the material system performs well compared to MLLs made of two-materials and that it is in excellent agreement with the numerically calculated efficiency for a comparable molybdenum/silicon bilayer system lens. We conclude that the three material system offers high efficiencies and is advantageous for stress reduction in MLLs.

: http://publica.fraunhofer.de/documents/N-442077.html