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Bragg-Fresnel Optics

enlarged view

Bragg-Fresnel Lenses with extended aperture for synchrotron beams (with A. Firsov, BESSY GmbH)

The necessity to design an optical element for a particular geometry and one fixed energy conflicts with the desired flexibility of the experimental arrangement and limits the number of possible experimental methods, mainly to μ-fluorescence analysis and μ-diffraction. The properties of static, made by etching including a metallic structure on the surface of multilayers and crystals, or dynamic, produced by surface and volume acoustic waves were measured and calculated. Bragg-Fresnel gratings are basic elements for the construction of a variety of X-ray optical devices including fast X-ray modulators and spectrometers. Understanding their properties is essential for the design of efficient high resolution, focusing dispersive X-ray optics.