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Spectrum and space resolved 4D imaging by coded aperture correlation holography (COACH) with diffractive objective

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    This study introduces an advanced coded aperture correlation holography (COACH) system for 4D imaging. The new optical setup enables simultaneous 3D spatial and spectral resolution for enhanced object reconstruction.

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    Area of Science:

    • Optics and Photonics
    • Holography
    • 3D Imaging

    Background:

    • Traditional holographic techniques face limitations in resolving spectral information alongside spatial dimensions.
    • Coded aperture correlation holography (COACH) offers a framework for advanced imaging but requires optimization for multi-dimensional data acquisition.

    Purpose of the Study:

    • To develop and demonstrate an advanced optical configuration of COACH for simultaneous 4D imaging (3 spatial + 1 spectral dimension).
    • To validate the system's capability in reconstructing objects with both spatial and spectral information using a diffractive objective lens.

    Main Methods:

    • An advanced optical setup for COACH was designed, incorporating a diffractive objective lens.
    • Holograms of 3D objects under varying wavelengths were recorded via interference with light diffracted through a coded phase mask (CPM).
    • A library of point spread function (PSF) holograms was prerecorded for different axial locations and wavelengths using the same CPM.

    Main Results:

    • The correlation of object holograms with prerecorded PSF holograms enabled selective reconstruction of objects at specific axial planes and wavelengths.
    • The system successfully demonstrated 4D imaging, resolving objects in three spatial dimensions and their spectral characteristics.
    • Reconstruction results were validated through comparison with conventional imaging and Fresnel incoherent correlation holography.

    Conclusions:

    • The proposed COACH configuration with a diffractive objective lens effectively achieves 4D imaging, integrating spectral information with high spatial resolution.
    • This advanced holographic technique provides a powerful tool for analyzing objects with complex spectral and spatial properties.
    • The method shows promise for applications requiring detailed multi-dimensional characterization of specimens.