Highly coherent illumination for imaging through opacity
Highly coherent illumination for imaging through opacity
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DOI：
10.1016/j.optlaseng.2021.106796
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发表时间：
2022-02
影响因子：
4.6
通讯作者：
R. Ma;Zhao Wang;E. Manuylovich;Wei Li Zhang;Yong Zhang;H. Zhu;Jun Liu;Dianyuan Fan;Y. Rao;A. Gomes
中科院分区：
文献类型：
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作者：
R. Ma;Zhao Wang;E. Manuylovich;Wei Li Zhang;Yong Zhang;H. Zhu;Jun Liu;Dianyuan Fan;Y. Rao;A. Gomes
近年来，不透明成像因其在生物成像系统和从扰乱光中提取信息方面的应用而引起了广泛的关注。在以往的研究中，许多优化的图像重建算法和先进的成像场景被引入并深入研究。然而，由于强烈的干涉效应，高相干光照明下的基于强度的图像重建仍然是一个主要的挑战。在这里，我们证明了即使在高相干照明下，借助基于强度的/非相干去卷积算法，也可以有效地实现通过不透明度的成像。在实验和理论分析的基础上，我们发现漫射体较小的位相关联长度是实现高相干光非相干反卷积运算的关键。此外，去卷积算法表现出对光相干性的不敏感性，因为物体的空间频率被很好地保存在散斑图案的空间频谱中。我们的结果为在高相干光照射下通过不透明成像提供了一种无相位信息的方案。我们预计，我们的工作将促进对使用高度相干照明的成像的深入理解，增加成像系统的结构健壮性，并促进波长敏感成像应用。
Imaging through opacity has captured extensive attention in recent years for its promising applications in bioimaging systems and information extraction from scrambled light. Many optimized image reconstruction algorithms and advanced imaging scenarios are introduced and intensively studied in previous researches. However, intensity-based image reconstruction under the highly coherent light illumination is still a major challenge due to the strong interference effect. Here, we demonstrate that imaging through opacity can be implemented efficiently even under the highly coherent illumination with the aid of an intensity-based/incoherent deconvolution algorithm. Based on the experimental and theoretical analysis, we find the small phase correlation length of the diffuser plays a pivotal role in enabling the incoherent deconvolution operation for highly coherent illumination. Furthermore, the deconvolution algorithm shows insensitivity to the light coherence since the spatial frequencies of the object are well preserved in the spatial frequency spectrum of the speckle pattern. Our results provide a phase-information-free scheme for imaging through opacity under the highly coherent illumination. We anticipate our work would motivate the deep understanding of imaging using highly coherent illumination, increase the structural robustness of imaging systems and facilitate wavelength-sensitive imaging applications.