We demonstrate an x-ray beam splitter with high performances for multi-kilo-electron-volt photons. The device is based on diffraction on kinoform structures, which overcome the limitations of binary diffraction gratings. This beam splitter achieves a dynamical splitting ratio in the range 0-99.1% by tilting the optics and is tunable, here shown in a photon energy range of 7.2-19 keV. High diffraction efficiency of 62.6% together with an extinction ratio of 0.6% is demonstrated at 12.4 keV, with angular separation for the split beam of 0.5 mrad. This device can find applications in beam monitoring at synchrotrons, at x-ray free electron lasers for online diagnostics and beamline multiplexing and, possibly, as key elements for delay lines or ultrashort x-ray pulses manipulation.
@article{arxiv.1711.11083,
title = {Tunable kinoform x-ray beam splitter},
author = {Maxime Lebugle and Gediminas Seniutinas and Felix Marschall and Vitaliy A. Guzenko and Daniel Grolimund and Christian David},
journal= {arXiv preprint arXiv:1711.11083},
year = {2017}
}