Chinese Optics Letters, Volume. 20, Issue 9, 091102(2022)

Dispersion control of broadband super-Rayleigh speckles for snapshot spectral ghost imaging

Pengwei Wang1,2, Zhentao Liu1,2,*, Jianrong Wu1, Xia Shen1, and Shensheng Han1,2,3
Author Affiliations
  • 1Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
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    Snapshot spectral ghost imaging, which can acquire dynamic spectral imaging information in the field of view, has attracted increasing attention in recent years. Studies have shown that optimizing the fluctuation of light fields is essential for improving the sampling efficiency and reconstruction quality of ghost imaging. However, the optimization of broadband light fields in snapshot spectral ghost imaging is challenging because of the dispersion of the modulation device. In this study, by judiciously introducing a hybrid refraction/diffraction structure into the light-field modulation, snapshot spectral ghost imaging with broadband super-Rayleigh speckles was demonstrated. The simulation and experiment results verified that the contrast of speckles in a broad range of wavelengths was significantly improved, and the imaging system had superior noise immunity.

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    1. Introduction

    Spectral imaging acquires a three-dimensional (3D) spectral data cube, in which additional spectral information contains a significant amount of object information. It plays an important role in many applications, such as astronomical imaging, remote sensing, and biomedical imaging[1,2]. In contrast to conventional spectral imaging, which requires time scanning along either the spatial or wavelength axis, snapshot spectral imaging acquires a 3D spectral data cube in a single exposure[3,4]. Depending on whether reconstruction is required, snapshot spectral imaging can be divided into computational snapshot spectral imaging and non-computational snapshot spectral imaging. Integral field spectrometry with faceted mirrors (IFS-M)[5], multi-aperture filtered camera (MAFC)[6], and image-replicating imaging spectrometer (IRIS)[7] are representative methods of non-computational snapshot spectral imaging. Meanwhile, computational snapshot spectral imaging[813] usually modulates the spatial and spectral information of an object by light-field spatial intensity fluctuation and reconstructs the 3D spectral data cube information from the detected intensity light distribution. With the development of computational snapshot spectral imaging via light-field amplitude modulation[8], the use of light-field phase modulation to achieve spatial intensity fluctuation has also made considerable progress in computational snapshot spectral imaging[913]. For example, spectral ghost imaging modulates the image in the entire spectral band by utilizing a spatial random phase modulator, and the spectral images of the object are obtained by second-order spatial mutual light-field correlation[11].

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    Pengwei Wang, Zhentao Liu, Jianrong Wu, Xia Shen, Shensheng Han. Dispersion control of broadband super-Rayleigh speckles for snapshot spectral ghost imaging[J]. Chinese Optics Letters, 2022, 20(9): 091102

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    Paper Information

    Category: Imaging Systems and Image Processing

    Received: Sep. 16, 2021

    Accepted: May. 20, 2022

    Posted: May. 23, 2022

    Published Online: Jun. 16, 2022

    The Author Email: Zhentao Liu (ztliu@siom.ac.cn)

    DOI:10.3788/COL202220.091102

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