Beam splitting characteristics of crystal X-ray Laue diffraction
-
Published:2022
Issue:4
Volume:71
Page:046101
-
ISSN:1000-3290
-
Container-title:Acta Physica Sinica
-
language:
-
Short-container-title:Acta Phys. Sin.
Author:
Zhao Chang-Zhe,Si Shang-Yu,Zhang Hai-Peng,Xue Lian,Li Zhong-Liang,Xiao Ti-Qiao, , ,
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.
Publisher
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Subject
General Physics and Astronomy
Reference23 articles.
1. Zhang K C 1998 Fundamentals of Modern Crystallography (Vol. 2) (Beijing: Science Press) pp2−7 (in Chinese)
张克从 1998 近代晶体学基础(下册)(北京: 科学出版社) 第2−7页
2. Xu C Y 2013 Synchrotron Radiation Optics and Engineering (Hefei: Press of University of Science and Technology of China) pp181−254 (in Chinese)
徐朝银 2013 同步辐射光学与工程(合肥: 中国科学技术大学出版社) 第181−254页
3. Xu H J, Zhao Z T 2008 Nucl. Sci. Tech 19 1
4. Tai R Z 2021 Physics 50 501
邰仁忠 2021 物理 50 501
5. Pelliccia D, Olbinado M P, Rack A, Kingston A M, Myers G R, Paganin D M 2018 IUCrJ 5 428
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献