X-ray Bragg optics

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Abstract
X‐ray diffraction optics is being in progress towards applications of conventional methods adopted from visible light optics. When evaluating prospects of its employment it should be kept in mind that the index of reflection for X‐rays differs from unit by the magnitude of an order Δn=10− 3–10− 5, so that thickness t of the diffraction element is to amount to (Δn)− 1 of wavelengths. It means that any X‐ray optic element is three‐dimensional that is why potentialities of ‘‘plane’’ X‐ray optics are limited. In the past years a number of papers have proposed Bragg diffraction phenomena to be employed for developing X‐ray optic systems1–4. The idea to use Bragg diffraction integrally with diffraction on an artificially fabricated Bragg‐grating‐based structure enables one to get over a number of difficulties and shortcomings inherent in ‘‘plane’’ X‐ray optics. Below are given experimental results of the studies and the analysis of some distinguishing features of Bragg‐Fresnel optics (BFO).

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