Abstract

The beam splitter is an optical element that divides a beam of light into two or more subbeams. It is an essential component in many optical experiments. X-ray has the characteristics of short wavelength and strong penetration ability, making it hard to use the optical elements in the visible-light region. Therefore, it is necessary to develop optical elements suitable for X-rays. The atomic layer spacing of the perfect crystal is of the same order of magnitude as the X-ray wavelength, so the crystal diffraction effect can be used to achieve the X-ray modulation. In this paper, the beam splitting characteristics of Laue crystal are analyzed based on X-ray diffraction dynamics and the influences of crystal absorption and incident light angular divergence on the rocking curves of transmission and diffraction are simulated. The modulation of the crystal diffraction in-plane angle and crystal thickness to Laue diffraction beam-splitting ratio is presented quantitatively. The results show that the kinematical theory of X-ray diffraction is not enough to analyze the beam splitting characteristics of the crystal. It is necessary to consider the interaction between the wave fields in the crystal and use the Pendellӧsung effect in the dynamical theory of X-ray diffraction to explain the change of the crystal beam-splitting ratio quantitatively. The influence of angular divergence and crystal absorption are considered in the simulation. The angular divergence broadens the bandwidth of the diffraction, thereby reducing diffraction intensity. The crystal absorption results in asymmetry and peak shift of the transmission curve and affects the intensity of diffraction and the intensity of transmission beam. The experimental results show that the non-dispersive (+n, –n) configuration can effectively eliminate the influence of angle divergence. The beam-splitting ratio can be adjusted in a small range (±2%) by changing the in-plane angle and adjusted in a wide range (±75%) by changing the crystal thickness, thereby realizing the quantitative modulation of the intensity of transmission and diffraction beam.

Highlights

  • Beam splitting ratio, rocking curve FWHM measurement value obtained with different crystal thickness

  • 本文从 X 射线衍射动力学出发, 分析了影响 晶体分束比的因素并在 X 光学测试线进行了实验 验证

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Summary

Introduction

多晶体光路配置的X射线衍射特性及在表征同步辐射光束线带宽上的应用 Characteristics of multi-crystals monfiguration X-ray diffraction and application in characterizing synchrotron beamline bandwidth 物理学报. 上海光源硬X射线相干衍射成像实验方法初探 Preliminary exploration of hard X-ray coherent diffraction imaging method at SSRF 物理学报. 共振X射线衍射研究高温超导Sr2CuO3.4晶体中的调制结构 Resonant X-ray diffraction studies on modulation structures of high temperature superconducting sample Sr2CuO3.4 物理学报. 利用X射线衍射技术对压电材料本征与非本征起源探究的研究进展 Research progress of the investigation of intrinsic and extrinsic origin of piezoelectric materials by X-ray diffraction 物理学报.

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