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27 September 2008 Testing of x-ray prism lenses
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Abstract
X-ray prism lenses have been defined with the aim to collimate X-ray radiation emitted from an X-ray tube working as a condenser lenses. Such a lens must have a large aperture as low absorption as possible. X-ray prism lenses combine low absorption and large apertures. They are made up of a large array of equilateral triangular prismatic microstructures. The intent by using these structures is to obtain as many refracting surfaces as possible in the smallest volume. The higher surface-volume-ratio in comparison to standard lenses reduces absorption significantly at the expense of focus quality. A first lens has been fabricated by X-ray lithography out of PMMA, with a designed aperture of up to 1.4 mm working distances of 325 mm to the point source and X-ray energy of 9 keV. The edge-length of the prismatic microstructures is 10 μm. The lenses have been tested at the ESRF in (Grenoble, France) and at ANKA (Karlsruhe, Germany). The results show an influence of the imperfections of the lens structures (bended prismatic microstructures) on the focal spot along the focal line. The measured gain was 28 at a focal width of 8 μm at full width at half maximum. Due to these imperfections the relevant aperture is currently limited to 500 μm.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Simon, E. Reznikova, V. Nazmov, M. Umbach, and A. Last "Testing of x-ray prism lenses", Proc. SPIE 7100, Optical Design and Engineering III, 710025 (27 September 2008); https://doi.org/10.1117/12.797885
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