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Random phase-shifting digital holography based on a self-calibrated system.

Peng Xia, Qinghua Wang, Shien Ri

    Optics Express
    |July 19, 2020
    PubMed
    Summary

    A novel self-calibrated system for random phase-shifting digital holography is introduced. This method simultaneously records holograms and calibration fringes, enabling accurate phase calculation for improved holographic imaging.

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    Area of Science:

    • Optics and Photonics
    • Digital Holography
    • Metrology

    Background:

    • Traditional digital holography often requires precise control over phase shifts.
    • Simultaneous recording of holograms and calibration data can simplify the process.
    • Self-calibration methods enhance the robustness of holographic systems.

    Purpose of the Study:

    • To propose a self-calibrated random phase-shifting digital holography system.
    • To enable simultaneous recording of holograms and calibration interference fringes.
    • To accurately determine phase shifts without prior knowledge.

    Main Methods:

    • Utilizing a space-division-multiplexing technique for simultaneous recording.
    • Employing the sampling Moiré method to calculate phase-shifting amounts.
    • Recording three randomly phase-shifted holograms and their corresponding fringes.
    • Implementing a self-calibrated system for random phase-shifting digital holography.

    Main Results:

    • Successfully demonstrated the simultaneous recording of holograms and calibration fringes in a single image.
    • Accurately calculated random phase-shifting amounts using the sampling Moiré method.
    • Validated the effectiveness of the proposed self-calibrated system through numerical simulations and experimental tests.
    • Achieved reliable holographic reconstruction of a reflective object.

    Conclusions:

    • The proposed self-calibrated random phase-shifting digital holography system is effective.
    • Simultaneous recording and Moiré-based phase calculation offer a robust approach.
    • This method simplifies the process and enhances the accuracy of digital holographic measurements.