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Updated: Dec 13, 2025

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Phase retrieval and adaptive optics correction for systems with diffractive surfaces.

Emily Finan, Tom Milster

    Applied Optics
    |August 5, 2020
    PubMed
    Summary

    Adaptive optics (AO) corrects aberrations by measuring phase information. This study presents a modified Gerchberg algorithm for phase retrieval, enabling AO correction on diffractive surfaces like optical disks.

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    Area of Science:

    • Optics
    • Wavefront Sensing and Control
    • Diffractive Optics

    Background:

    • Adaptive optics (AO) corrects aberrations from atmospheric turbulence or sample thickness.
    • Diffractive surfaces introduce additional phase components not related to extrinsic aberrations.
    • Existing AO methods require adaptation for systems with diffractive elements.

    Purpose of the Study:

    • To extend adaptive optics (AO) techniques to systems with diffractive surfaces.
    • To develop a phase retrieval method capable of separating diffractive phase from extrinsic aberrations.
    • To demonstrate AO correction for extrinsic aberrations on a diffractive surface.

    Main Methods:

    • A modified Gerchberg algorithm was employed for phase retrieval.
    • The algorithm was designed to detect total aberration, including diffractive components.

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  • Simulations and experimental validation were performed using a grating and a microscope system.

    • Main Results:

    • The modified Gerchberg algorithm successfully retrieved phase information from a diffractive surface.
    • Extrinsic aberrations were corrected for light reflected from a grating.
    • Experimental results confirmed the efficacy of the AO correction method.

    Conclusions:

    • The modified Gerchberg algorithm is a viable method for phase retrieval in systems with diffractive surfaces.
    • Adaptive optics correction is achievable even in the presence of diffractive phase contributions.
    • This work validates AO correction for extrinsic aberrations on diffractive surfaces, opening new possibilities for imaging and optical systems.