title: Multicavity x-ray Fabry-Perot resonance with ultrahigh resolution and contrast.
abstract: Realization of x-ray Fabry-Perot (FP) resonance in back-Bragg-reflection crystal cavities has been proposed and explored for many years, but to date no satisfactory performance has been achieved. Here we show that single-cavity crystal resonators intrinsically have limited finesse and efficiency. To break this limit, we demonstrate that monolithic multicavity resonators with equal-width cavities and specific plate thickness ratios can generate ultrahigh-resolution FP resonance with high efficiency, steep peak tails, and ultrahigh contrast simultaneously. The resonance mechanism is similar to that of sequentially cascaded single-cavity resonators. The ultranarrow-bandwidth FP resonance is anticipated to have various applications, including modern ultrahigh-resolution or precision x-ray monochromatization, spectroscopy, coherence purification, coherent diffraction, phase contrast imaging, etc.
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA. xiahuang@aps.anl.gov
authors.forename: X R
authors.initials: XR
authors.lastname: Huang
authors.forename: D P
authors.initials: DP
authors.lastname: Siddons
authors.forename: A T
authors.initials: AT
authors.lastname: Macrander
authors.forename: R W
authors.initials: RW
authors.lastname: Peng
authors.forename: X S
authors.initials: XS
authors.lastname: Wu