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Updated: Jul 9, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Angle-multiplexed hologram storage in LiNbO(3):Tb, Fe.

M Lee, S Takekawa, Y Furukawa

    Optics Letters
    |December 11, 2007
    PubMed
    Summary

    This study demonstrates hologram multiplexing in a photochromic lithium niobate crystal. Despite decreasing sensitivity, a conventional recording schedule is viable, achieving an M/# of 1.73.

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    Area of Science:

    • Holography
    • Photorefractive materials
    • Optical data storage

    Background:

    • Near-stoichiometric lithium niobate (LiNbO3) crystals doped with Tb and Fe exhibit UV-induced absorption.
    • This photochromic behavior affects hologram multiplexing performance.

    Purpose of the Study:

    • To investigate hologram multiplexing in UV-preexposed LiNbO3:Tb, Fe crystals.
    • To evaluate the feasibility of conventional recording schedules for photochromic materials.

    Main Methods:

    • Angle multiplexing of 50 plane-wave holograms using a 532 nm continuous-wave laser.
    • Recording holograms in a UV-preexposed LiNbO3:Tb, Fe crystal.

    Main Results:

    • Recording sensitivity decreased gradually due to bleaching of UV-induced absorption.
    • A conventional recording schedule for equal diffraction efficiency was found to be applicable.
    • Increased erasure-time constants compensated for reduced sensitivity in later holograms.
    • An M/# of 1.73 was achieved in a 3.3-mm thick crystal.

    Conclusions:

    • Hologram multiplexing is feasible in photochromic LiNbO3:Tb, Fe crystals.
    • Conventional recording schedules can be employed despite sensitivity variations.
    • The material's properties allow for effective multi-hologram storage.

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