Sapphire hard X-ray Fabry–Perot resonators for synchrotron experiments

Hard X-ray Fabry–Perot resonators (FPRs) made from sapphire crystals were constructed and characterized. The FPRs consisted of two crystal plates, part of a monolithic crystal structure of Al2O3, acting as a pair of mirrors, for the backward reflection (0 0 0 30) of hard X-rays at 14.3147 keV. The dimensional accuracy during manufacturing and the defect density in the crystal in relation to the resonance efficiency of sapphire FPRs were analyzed from a theoretical standpoint based on X-ray cavity resonance and measurements using scanning electron microscopic and X-ray topographic techniques for crystal defects. Well defined resonance spectra of sapphire FPRs were successfully obtained, and were comparable with the theoretical predictions.

Source: Journal of Synchrotron Radiation - April 18, 2016 Category: Physics Authors: Tsai, Y.-W.Wu, Y.-H.Chang, Y.-Y.Liu, W.-C.Liu, H.-L.Chu, C.-H.Chen, P.-C.Lin, P.-T.Fu, C.-C.Chang, S.-L. Tags: sapphire Fabry – Perot resonator coherent X-rays backward diffraction dynamical diffraction high-resolution monochromator research papers Source Type: research