With continuing improvements in X-ray optics, conventional techniques for measuring their performance are finding it hard to keep up. Iterative phase-retrieval algorithms for reconstructing an optical field at the focus of an optical element could not only solve this problem, but remove the need for such optics altogether.
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Jacobsen, C. Imaging at arm's length. Nature Phys 2, 71–72 (2006). https://doi.org/10.1038/nphys230
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DOI: https://doi.org/10.1038/nphys230
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