We demonstrate parabolic single-crystal diamond compound refractive
lenses [1] designed for coherent x-ray imaging
resilient to extreme thermal and radiation loading expected from
next generation light sources. To ensure the preservation of
coherence and resilience, the lenses are manufactured from the highest-quality
single-crystalline synthetic diamond material grown by a high-pressure
high-temperature technique. Picosecond laser milling is
applied to machine lenses to parabolic shapes with a ~1-micron
precision and surface roughness. A compound refractive lens
comprised of six lenses with a radius of curvature R=200 microns at
the vertex of the parabola and a geometrical aperture A=900 microns
focuses 10~keV x-ray photons from an undulator source at the Advanced
Photon Source facility to a focal spot size of ~ 10x40 microns^2 with a gain factor of ~100.\\
[1] S. Terentyev, V. Blank, S. Polyakov, S. Zholudev, A. Snigirev, M. Polikarpov, T. Kolodziej, J. Qian,
H. Zhou, and Yu. Shvyd'ko Applied Physics Letters 107, 111108 (2015); doi: 10.1063/1.4931357
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