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

• Published in: Applied physics letters Vol. 110; no. 11
• Main Authors: Kubec, A., Maser, J., Formánek, P., Franke, V., Braun, S., Gawlitza, P., Leson, A., Macrander, A.
• Format: Journal Article
• Language: English
• Published: United States American Institute of Physics (AIP) 13-03-2017
• Subjects: MATERIALS SCIENCE
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.4978610

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.