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Frequency expanded non-interferometric phase retrieval for holographic data storage.

Xiao Lin, Jianying Hao, Kun Wang

    Optics Express
    |March 3, 2020
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    Summary
    This summary is machine-generated.

    A new holographic data storage method uses frequency expansion to retrieve phase information. This technique breaks the twice Nyquist frequency limitation, enabling higher storage density and reduced media consumption.

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    Area of Science:

    • Optics and Photonics
    • Information Storage

    Background:

    • Holographic data storage offers high density but faces limitations in phase retrieval fidelity.
    • Current methods often require recording up to twice the Nyquist frequency, increasing media consumption and limiting storage density.

    Purpose of the Study:

    • To propose a novel frequency-expanded non-interferometric phase retrieval method for holographic data storage.
    • To overcome the limitations of traditional phase retrieval methods and enhance storage density.

    Main Methods:

    • A non-interferometric phase retrieval technique is employed, recording only 1x Nyquist frequency of the hologram.
    • Artificial generation of high-order frequencies is achieved by expanding the 1x Nyquist frequency using frequency periodicity.

    Main Results:

    • The method successfully breaks the twice Nyquist frequency limitation for high-fidelity phase retrieval.
    • It records, reconstructs, and detects holograms within the smallest frequency range reported for complex multi-level phase retrieval.
    • Storage density is increased by reducing media consumption and decreasing the recording area by 4 times compared to twice Nyquist frequency recording.

    Conclusions:

    • The proposed frequency-expanded method significantly enhances storage density in holographic data storage.
    • This approach offers a more efficient and less resource-intensive solution for holographic data storage compared to existing methods.