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Iterative phase retrieval based on variable wavefront curvature.

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    This study introduces a new phase retrieval technique using varied illumination distances. This method enhances resolution and simplifies reconstruction compared to iterative approaches.

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    Area of Science:

    • Optics and Photonics
    • Image Reconstruction
    • Diffraction Imaging

    Background:

    • Iterative phase retrieval methods are common but can be complex.
    • Maintaining resolution and handling pixel size variations are challenges in phase retrieval.

    Purpose of the Study:

    • To present an alternative phase retrieval technique.
    • To improve resolution and simplify the reconstruction procedure.
    • To address limitations of traditional iterative methods.

    Main Methods:

    • Recording diffraction patterns at varying distances between the illumination source and the object.
    • Utilizing direct Fresnel propagation for reconstruction.
    • Analyzing and accounting for speckle decorrelation effects.

    Main Results:

    • The proposed method offers advantages in resolution and reconstruction simplicity.
    • Varying illumination distance preserves resolution, similar to changing object-sensor distance.
    • Direct Fresnel propagation is applicable without pixel size concerns.

    Conclusions:

    • The alternative phase retrieval technique provides a viable and advantageous approach.
    • Experimental implementation considers speckle decorrelation for robustness.
    • This method simplifies phase retrieval while maintaining high resolution.