title: Sapphire hard X-ray Fabry-Perot resonators for synchrotron experiments.
abstract: 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.
authors.affiliation: Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan.
authors.forename: Yi Wei
authors.initials: YW
authors.lastname: Tsai
authors.affiliation: Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan.
authors.forename: Yu Hsin
authors.initials: YH
authors.lastname: Wu
authors.affiliation: National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan.
authors.forename: Ying Yi
authors.initials: YY
authors.lastname: Chang
authors.affiliation: Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan.
authors.forename: Wen Chung
authors.initials: WC
authors.lastname: Liu
authors.affiliation: Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan.
authors.forename: Hong Lin
authors.initials: HL
authors.lastname: Liu
authors.affiliation: National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan.
authors.forename: Chia Hong
authors.initials: CH
authors.lastname: Chu
authors.affiliation: Institute of NanoEngineering and MicroSystems, National Tsing Hua University, Hsinchu 300, Taiwan.
authors.forename: Pei Chi
authors.initials: PC
authors.lastname: Chen
authors.affiliation: Institute of NanoEngineering and MicroSystems, National Tsing Hua University, Hsinchu 300, Taiwan.
authors.forename: Pao Te
authors.initials: PT
authors.lastname: Lin
authors.affiliation: Institute of NanoEngineering and MicroSystems, National Tsing Hua University, Hsinchu 300, Taiwan.
authors.forename: Chien Chung
authors.initials: CC
authors.lastname: Fu
authors.affiliation: Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan.
authors.forename: Shih Lin
authors.initials: SL
authors.lastname: Chang
keywords: backward diffraction; coherent X-rays; dynamical diffraction; high-resolution monochromator; sapphire Fabry–Perot resonator