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2 October 2019 Diffraction compensation of slope errors on strongly curved grating substrates
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In 2019, the Institut für angewandte Photonik (IAP) e. V. in cooperation with Nano Optics Berlin (NOB) GmbH and SIOS Meßtechnik GmbH has made an important progress in the technology for precision soft X-ray optics – the development of three-dimensional (3-D) reflection zone plates (RZPs) with diffractive compensation of slope errors. 2-D mapping of spherical and toroidal grating substrates was used for the metrology of their individual profile. Based on these data, the inscribed grating structure, which corrects the slope error distribution, was computed. The correction algorithm has been implemented as a Python script, and first pilot samples of slope error compensated RZPs are in fabrication process. The 3-D device can replace two or three components in an optical scheme and, therefore, reduce absorption losses by several orders of magnitude. Beyond, the fabrication of customized 3-D Fresnel structures on curved substrates promises considerable improvements for efficiency, resolution and energy range in wavelength dispersive applications. As an example, we present simulations for a compact instrument within (150 – 250) eV. Further development of this approach toward commercial availability will enable the design and construction of compact soft Xray monochromators and spectrometers with unique parameters.
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Christoph Braig, Jürgen Probst, Enrico Langlotz, Ilko Rahneberg, Michael Kühnel, Alexei Erko, Thomas Krist, and Christian Seifert "Diffraction compensation of slope errors on strongly curved grating substrates", Proc. SPIE 11109, Advances in Metrology for X-Ray and EUV Optics VIII, 111090U (2 October 2019);


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