17 September 2012 Resolution limits of transmission optics for x-ray astronomy
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Abstract
We report on recent theoretical and experimental results on diffractive-refractive transmission lenses as promising candidates for next-generation X-ray telescopes with an ultra-high angular resolution. This feature is especially analyzed for elementary refractive, diffractive and dispersion-corrected hybrid lenses and a fundamental limit to the angular resolution for optics of the latter type is identified. An inherent flexibility in adjusting the image sharpness is obtained from the segmentation of an aperture into small partitions, whose degree of coherence can be controlled continuously. Successfully realized monolithic phase zone plates from a spin-coated polymer show the way to the practical implementation of large-scale objectives. Based on these concepts, an arrangement for enhanced and variable high-throughput imaging around the Fe-Kα line at 6.4 keV is finally proposed.
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Christoph Braig, Christoph Braig, Vadim Burwitz, Vadim Burwitz, Thomas Käsebier, Thomas Käsebier, Ernst-Bernhard Kley, Ernst-Bernhard Kley, Peter Predehl, Peter Predehl, Andreas Tünnermann, Andreas Tünnermann, } "Resolution limits of transmission optics for x-ray astronomy", Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 844341 (17 September 2012); doi: 10.1117/12.925542; https://doi.org/10.1117/12.925542
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