Evaluation of imaging properties of soft x-ray multilayer mirrors and their application to highly dispersive spectral imaging

Astronomy and Astrophysics – Astrophysics

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X- And Gamma-Ray Sources, Mirrors, Gratings, And Detectors, X- And Gamma-Ray Lasers, X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

A variety of normal-incidence multilayer mirrors (MMs) intended for studies of astrophysical and laboratory soft-x-ray radiation sources have been synthesized on concave (r=1.6-2.0 m) fused silica substrates. The MMs range in resonance wavelength λ0 from 4.5 to 31 nm. Their imaging capability has been evaluated from small-source imaging tests employing to a laser-plasma broadband XUV radiation source and a high-resolution XUV photographic film. The photographs testify to a subarcsecond angular resolution. For 17.5-nm MMs, a resolution of at least ~=0.32 arcseconds has been demonstrated, which is only 2.4λ0/D for the MMs involved.

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