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Computer-generated-hologram-based holographic data storage using common-path off-axis digital holography.

Naru Yoneda, Yusuke Saita, Takanori Nomura

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    A new method enhances holographic data storage density using computer-generated holography and off-axis digital holography. This technique successfully reconstructs multilevel complex encoded data-pages with a simple optical setup.

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    Area of Science:

    • Optics and Photonics
    • Data Storage Technologies
    • Digital Holography

    Background:

    • Holographic data storage offers high density but faces challenges in recording and reconstruction.
    • Computer-generated holography (CGH) enables digital control over holographic patterns.
    • Off-axis digital holography is a technique for recording and reconstructing holograms.

    Purpose of the Study:

    • To propose a novel reconstruction method for multilevel complex encoded data-pages.
    • To enhance the recording density of computer-generated-hologram-based holographic data storage.
    • To achieve high-fidelity reconstruction with a simplified optical configuration.

    Main Methods:

    • The proposed method utilizes off-axis digital holography for data-page reconstruction.
    • It leverages computer-generated holography to maintain a simple, common-path optical setup.
    • Experimental validation was performed using five-level complex encoded data-pages.

    Main Results:

    • Successful experimental reconstruction of five-level complex encoded data-pages was demonstrated.
    • The method effectively increases recording density in holographic data storage.
    • A simple and common-path optical configuration was maintained throughout the process.

    Conclusions:

    • The proposed reconstruction method is effective for multilevel complex encoded data-pages.
    • This approach significantly enhances recording density in CGH-based holographic data storage.
    • The integration of off-axis digital holography with CGH offers a practical solution for advanced data storage.