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Iterative phase-retrieval-assisted off-axis terahertz digital holography.

Yuchen Zhao, Jean-François Vandenrijt, Murielle Kirkove

    Applied Optics
    |December 25, 2019
    PubMed
    Summary

    This study introduces an iterative phase-retrieval method to enhance terahertz digital holography imaging. The technique improves reconstruction quality for off-axis holograms, overcoming recording distance limitations.

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    Area of Science:

    • Optics and Photonics
    • Imaging Science

    Background:

    • Off-axis configuration is optimal for non-sparse, complex objects in terahertz digital holography.
    • Recording distance limitations in off-axis holography degrade imaging quality, causing low resolution or spectral overlap.

    Purpose of the Study:

    • To propose and validate an iterative phase-retrieval approach for improving terahertz digital hologram reconstruction.
    • To overcome the imaging quality limitations associated with the recording distance in off-axis configurations.

    Main Methods:

    • An iterative phase-retrieval algorithm was developed.
    • An additional object wave intensity capture was utilized for phase retrieval.
    • Off-axis reconstruction served as the initial guess.
    • Apodization was applied to suppress diffraction effects.

    Main Results:

    • The proposed method significantly improved image quality in terahertz digital holography.
    • Both simulation and experimental verifications confirmed the enhancement in reconstruction results.
    • Undesired border diffraction effects were successfully suppressed.

    Conclusions:

    • The iterative phase-retrieval approach effectively enhances the quality of terahertz digital holograms.
    • This method provides a viable solution to the recording distance limitations in off-axis configurations.
    • The technique offers improved resolution and spectral separation for complex object imaging.