High-resolution monochromator using a high-efficiency single-mode x-ray resonator at Laue incidence.

We report a high-resolution and high-efficiency monochromator with energy resolution, triangle E/E similar to 2.08 * 10(-7), utilizing a hard x-ray single-mode Fabry-Perot (FP) resonator at Laue incidence at 14.4388 keV. Instead of using multiple-crystal diffraction via several asymmetric-cut crystals, a 3 meV single-peak is generated from the interference of a Si-made two-plate cavity with a thickness of 70 mu m and a gap of 45 mu m, where a (0 -4 0) Laue reflection is used to excite the backreflection (12 4 0) for the enhancement of the FP efficiency. Due to the large angular acceptance of (12 4 0) and (0 -4 0), the energy tunability can be achieved by changing the incident angle into the resonator. The application of x-ray resonators at Laue incidence as a monochromator can be further implemented to x-ray optics. (C) 2017 Optical Society of America