In this contribution, we compare the performance of Hartmann masks and inverted Hartmann masks of different periods for phase-sensitive X-ray imaging. The Hartmann masks were gold meshes and the inverted Hartmann masks were arrays of gold pillars, both manufactured by UV lithography and gold electroforming on low-absorbing graphite substrates. We asses masks performance by comparing the visibility and homogeneity of the periodic patterns. Manufactured customized masks exhibit clear periodic patterns and demonstrate visibility values from 30 % to 50 % depending on the setup configuration. Finally, we show the phase contrast imaging with an angular resolution of 1.5 μm and demonstrate that images obtained with an inverted Hartmann mask have superior quality.
Inspired by the recently successfully demonstrated Shack-Hartmann sensors for hard X-rays, we present a twodimensional compound refractive lens array (CRLA) with parabolic shapes for multimodal X-ray imaging. The promising structure was produced by two-photon polymerization using state-of-the-art 3D-Printer, which allows the manufacturing of sub-micrometer structures. The 2D parabolic microlens array with 12x12 spots was characterized by scanning electron microscopy and X-ray imaging. For an X-ray energy of 8.5 keV the average focal spot size is around 8 μm at a focal distance of 38.2±0.5 cm with a visibility of 0.72. As an example of a potential application for quantitative optics characterization a diamond refractive lens was investigated by multi-contrast imaging resulting in a 0.4 μrad differential phase resolution.
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