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    Area of Science:

    • Optics and Photonics
    • Holography
    • Image Reconstruction

    Background:

    • Coded aperture correlation holography (COACH) requires accurate point spread function (PSF) measurement for image reconstruction.
    • Traditional PSF measurement using pinholes suffers from resolution limitations and inability to detect far-field PSFs due to light attenuation.

    Purpose of the Study:

    • To develop a novel method for PSF measurement in COACH systems.
    • To overcome the resolution and detection limitations associated with pinhole-based PSF measurement.

    Main Methods:

    • A wavefront modulation technique is employed to generate a virtual point spread function (VPSF).
    • A plane wave is modulated using a carrier spherical wave and a coded phase mask to create the VPSF.

    Main Results:

    • The proposed method successfully generates a VPSF for image reconstruction.
    • The resolution of reconstructed images is no longer limited by the pinhole's cutoff frequency.
    • Experimental demonstration confirms high-resolution image reconstruction using the VPSF.

    Conclusions:

    • Wavefront modulation offers a superior alternative to pinhole-based methods for PSF measurement in COACH.
    • The VPSF enables high-resolution image reconstruction, overcoming previous limitations.
    • This technique has significant implications for advancing COACH imaging capabilities.