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    This study demonstrates extracting particle extinction cross sections from digital holograms. The method accurately determines cross sections for various particles and can estimate absorption cross sections using scattered light data.

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    Area of Science:

    • Optics
    • Particle characterization
    • Digital holography

    Background:

    • Digital holography is a powerful technique for 3D imaging.
    • Accurate measurement of particle optical properties is crucial in various scientific fields.
    • Existing methods for determining extinction cross sections can be limited.

    Purpose of the Study:

    • To develop and validate a method for extracting particle extinction cross sections from digital holograms.
    • To assess the accuracy of the method for a wide range of particle sizes and shapes.
    • To investigate the potential for estimating absorption cross sections using holographic data.

    Main Methods:

    • Numerical simulations of digital holograms for particles with known properties.
    • Experimental generation of digital holograms of spherical and nonspherical particles.
    • Analysis of holographic data to extract extinction cross sections.
    • Evaluation of the angular range of scattered light for absorption estimation.

    Main Results:

    • A reliable method for extracting extinction cross sections from digital holograms was demonstrated.
    • The method achieved typical errors of less than 10% for a broad range of particle cross-sectional values (five orders of magnitude).
    • Holograms capturing a sufficient angular range of scattered light allowed for the estimation of absorption cross sections.

    Conclusions:

    • Digital holography provides a viable approach for accurate particle extinction cross section determination.
    • The developed technique is versatile, applicable to diverse particle types and sizes.
    • The angular distribution of scattered light in holograms offers insights into particle absorption properties.