低时间相干照明衍射成像研究进展(特邀)  

Recent advances in diffraction imaging with low temporal coherent illumination(invited)

作　　者：何忆康 王鹏程 边双龙 李芳凝 姜鹏宇 李显业 孙宝清 HE Yikang;WANG Pengcheng;BIAN Shuanglong;LI Fangning;JIANG Pengyu;LI Xianye;SUN Baoqing(School of Information Science and Engineering,Shandong University,Qingdao 266237,China;School of Mechanical,Electrical and Information Engineering,Shandong University,Weihai 264209,China)

机构地区：[1]山东大学信息科学与工程学院,山东青岛266237 [2]山东大学机电与信息工程学院,山东威海264209

出　　处：《红外与激光工程》2024年第9期32-48,共17页Infrared and Laser Engineering

基　　金：国家重点研发计划项目(2022YFC2807702);国家自然科学基金项目(12274262);山东省自然科学基金项目(ZR2023QF069)。

摘　　要：作为一种新型计算成像技术,相干衍射成像具有高分辨、无透镜、低成本等优势,在定量相位重建、高分辨成像、X射线成像等领域中具有非常重要的应用价值。传统相干衍射成像对光源的相干性具有非常高的要求,而在实际情况中,由于能量与时间的不确定关系、光束产生缺陷等原因,光源常面临一定的相干性限制。从混叠的衍射图样中实现相干模式分解,是解决低相干照明的衍射成像的重要手段。相比于空间相干性,时间相干性在光谱成像、超快成像等方面具有更高的应用潜力,在低相干衍射成像领域得到了广泛地讨论。基于以上现状,文中从相干衍射成像的部分相干模式表示理论出发,介绍了低时间相干照明衍射成像中的重构方案与重建算法的研究进展,分析并展望了低时间相干照明衍射成像面临的实际问题及发展趋势。Significance As a novel computational imaging technology,coherent diffraction imaging(CDI)offers advantages such as high resolution,lens-free,and low cost,making it highly promising for applications in quantitative phase reconstruction,high-resolution imaging,and X-ray imaging.Traditional CDI relies on coherent light illumination,demanding very high temporal and spatial coherence from the light source.However,in practical application,due to the uncertainty relationship between energy and time,the defective mechanisms of beam generation,the light source typically exhibits some spectral broadening.This causes the actual diffraction patterns to be a superposition of diffraction patterns from different coherent modes,rendering traditional reconstruction theories impractical and unable to achieve high-precision complex amplitude reconstruction of objects.Conventional solutions often attempt to enhance the coherence of the light source through spatial and spectral filtering,but these methods result in energy waste and pulse broadening,failing to fundamentally address the issue of diffraction imaging under low coherence illumination.Therefore,research on diffraction imaging under partially coherent or incoherent light sources performs great significance for reducing the cost of diffraction imaging,achieving attosecond diffraction imaging,and enabling multispectral diffraction imaging,has become a research hotspot in recent years.Progress First,the basic principles of monochromatic CDI are introduced,including the experimental arrangement,sampling ratio requirement,and phase retrieval algorithms.The theory of CDI is fundamentally established based on coherent illumination.Therefore,applying it to low-coherence illumination makes the existing CDI schemes unsuitable.According to the theory of the coherent mode of light,the broadband diffraction pattern is a direct sum of narrowband diffraction patterns from different spectrums.Hence,the key to realizing diffraction imaging with broadband illumination is to decompose the di

关 键 词：计算成像 衍射成像 相干模式分解 时间相干性 宽谱衍射成像 

分 类 号：O436.1[机械工程—光学工程]