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部分相干X光傅里叶变换鬼成像研究

Study on Fourier-Transform Ghost Imaging with Partially Coherent X-Ray

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摘要

鬼成像中通常是采用相干光辐照散射屏获取赝热光源,但是在X光波段,赝热光源的入射光为部分相干光,其空间部分相干性会对成像质量产生较大影响。采用高斯谢尔模型,理论分析了入射光的部分相干性对赝热X光二阶关联函数的影响,同时给出了基于统计光学的模拟结果,与理论结果吻合,均表明X光空间相干性会影响鬼成像的可见度和分辨率。在空间相干性有限的情况下,通过在散射屏前置尺寸与X光横向相干尺寸相当的针孔可以抑制部分相干性的影响,提高X光傅里叶变换鬼成像的可见度,将有利于实现X光傅里叶变换鬼成像技术的广泛应用。

Abstract

In the ghost imaging, a pseudo-thermal light source is generated by illuminating a diffuser with coherent light. However, in the X-ray region, the incident light of a pseudo-thermal light source is partially coherent, and the spatially partial coherence of the light has a great influence on the imaging quality. The influence of the X-ray partial coherence on the second order correlation function of pseudo-thermal light source is analyzed theoretically using the Gaussian Schell model. The simulation results based on the statistical optics are also given. Both the theoretical and simulated results show that the visibility and resolution of the ghost imaging are influenced by the X-ray spatial coherence. In the case of limited spatial coherence, the visibility of X-ray Fourier-transform ghost imaging can be improved by using a pinhole in front of the diffuser, and the width of the pinhole should be equal to the transverse coherent length of the X-ray. It will be beneficial to achieve the wide applications of X-ray Fourier-transform ghost imaging.

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中图分类号:O434.19

DOI:10.3788/aos201737.0411001

所属栏目:成像系统

基金项目:国家自然科学基金重大项目(11627811)

收稿日期:2016-11-08

修改稿日期:2016-12-16

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作者单位    点击查看

谈志杰:中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800中国科学院大学, 北京 100049
喻虹:中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800
陆荣华:中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800
赵鑫:中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800
韩申生:中国科学院上海光学精密机械研究所量子光学重点实验室, 上海 201800

联系人作者:谈志杰(tanzj@siom.ac.cn)

备注:谈志杰(1992-),男,硕士研究生,主要从事关联成像方面的研究。

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引用该论文

Tan Zhijie,Yu Hong,Lu Ronghua,Zhao Xin,Han Shensheng. Study on Fourier-Transform Ghost Imaging with Partially Coherent X-Ray[J]. Acta Optica Sinica, 2017, 37(4): 0411001

谈志杰,喻虹,陆荣华,赵鑫,韩申生. 部分相干X光傅里叶变换鬼成像研究[J]. 光学学报, 2017, 37(4): 0411001

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