The grazing-incidence hard X-ray retro-reflector (GIRR) is a novel optical element,\nwhich completely suppresses the conventional mirror beam in the retro-reflection\nmode, and, at the same time, totally reflects the primary grazing incident X-radiation\nbackwards to its source in strictly anti-parallel direction with minimal scattering. The\nGIRR is a good alternative to hard X-ray normal-incidence Bragg mirror, and has a\nhigh potential for applications in various X-ray optical devices and techniques, such\nas, hard X-ray optical noise (or background) filters, high-quality hard X-ray waveguides,\nlow-gain hard X-ray free electron laser resonators (XFELRs), X-ray holography,\ncoherent X-ray diffraction imaging, phase-contrast imaging, as well as in hard\nX-ray optical data storage devices and deep space hard X-ray communications. The\nproposed optical element consists of single-crystal wafer covered by a thin, non-diffracting\nlayer of low-absorbing material.
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