Laterally graded Si1-xGex crystals for high-resolution synchrotron x-ray optics

Alexei I. Erko; Franz Schaefers; Wolfgang Gudat; K. J. Sawhney; Nikolai V. Abrosimov; S. N. Rossolenko; V. Alex; S. Groth; W. Schroeder

doi:10.1117/12.259855

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22 November 1996 Laterally graded Si_1-xGe_x crystals for high-resolution synchrotron x-ray optics

Alexei I. Erko, Franz Schaefers, Wolfgang Gudat, K. J. Sawhney, Nikolai V. Abrosimov, S. N. Rossolenko, V. Alex, S. Groth, W. Schroeder

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Proceedings Volume 2856, Optics for High-Brightness Synchrotron Radiation Beamlines II; (1996) https://doi.org/10.1117/12.259855
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

We present first experimental data on a novel type of optical element for synchrotron radiation applications in the x-ray region: namely laterally-graded aperiodic crystals on the basis of Si_1-xGe_x alloys. The lattice parameter of such a gradient crystal containing up to some atomic % Ge in a Si single crystal changes nearly linearly along the plate of diffraction. Thus the variation of the Bragg angle of divergent incident light on the crystal can be compensated for. This opens up the possibility to operate a crystal monochromator in nearly crystal limited resolution in the whole energy range above 2 keV at the full vertical divergence without a collimating premirror. Simultaneously the reflected spectral intensity can be increased considerably as compared with a conventional Si-crystal monochromator.

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Alexei I. Erko, Franz Schaefers, Wolfgang Gudat, K. J. Sawhney, Nikolai V. Abrosimov, S. N. Rossolenko, V. Alex, S. Groth, and W. Schroeder "Laterally graded Si_1-xGe_x crystals for high-resolution synchrotron x-ray optics", Proc. SPIE 2856, Optics for High-Brightness Synchrotron Radiation Beamlines II, (22 November 1996); https://doi.org/10.1117/12.259855

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