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Pan, Huaihai; Späth, Christian; Guggenmos, Alexander; Chew, Soo Hoon; Schmidt, Jürgen; Zhao, Quan-zhong and Kleineberg, Ulf (2016): Low chromatic Fresnel lens for broadband attosecond XUV pulse applications. In: Optics Express, Vol. 24, No. 15: pp. 16788-16798

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Fresnel zone plates show a great potential in achieving high spatial resolution imaging or focusing for XUV and soft/hard X-ray radiation, however they are usually strictly monochromatic due to strong chromatic dispersion and thus do not support broad radiation spectra, preventing their application to attosecond XUV pulses. Here we report on the design and theoretical simulations based on the design of an achromatic hybrid optics combining both, a refractive and diffractive lens in one optical element. We are able to show by calculation that the chromatic dispersion along the optical axis can be greatly reduced compared to a standard Fresnel zone plate while preserving the temporal structure of the attosecond XUV pulses at focus. (C) 2016 Optical Society of America

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