Mandal Aditya Chandra, Sarkar Tushar, Zalevsky Zeev, Singh Rakesh Kumar
Laboratory of Information Photonics and Optical Metrology, Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttar Pradesh, 221005, India.
Department of Mining Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttar Pradesh, 221005, India.
Sci Rep. 2022 Mar 16;12(1):4564. doi: 10.1038/s41598-022-08603-4.
The coherence holography offers an unconventional way to reconstruct the hologram where an incoherent light illumination is used for reconstruction purposes, and object encoded into the hologram is reconstructed as the distribution of the complex coherence function. Measurement of the coherence function usually requires an interferometric setup and array detectors. This paper presents an entirely new idea of reconstruction of the complex coherence function in the coherence holography without an interferometric setup. This is realized by structured pattern projections on the incoherent source structure and implementing measurement of the cross-covariance of the intensities by a single-pixel detector. This technique, named structured transmittance illumination coherence holography (STICH), helps to reconstruct the complex coherence from the intensity measurement in a single-pixel detector without an interferometric setup and also keeps advantages of the intensity correlations. A simple experimental setup is presented as a first step to realize the technique, and results based on the computer modeling of the experimental setup are presented to show validation of the idea.
相干全息术提供了一种非传统的全息图重建方法，即使用非相干光照明进行重建，编码在全息图中的物体被重建为复相干函数的分布。相干函数的测量通常需要干涉测量装置和阵列探测器。本文提出了一种在无需干涉测量装置的情况下重建相干全息术中复相干函数的全新思路。这是通过在非相干源结构上进行结构化图案投影，并由单像素探测器实现强度互协方差的测量来实现的。这种技术名为结构化透射照明相干全息术（STICH），有助于在无需干涉测量装置的情况下从单像素探测器的强度测量中重建复相干函数，同时还保留了强度相关性的优势。作为实现该技术的第一步，展示了一个简单的实验装置，并给出了基于该实验装置计算机建模的结果，以证明该思路的有效性。
