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Dynamic coded encryption using tunable spatial coherence of random lasers.

Liming Gao, Wenzhi Wang, Zhihao Li

    Optics Express
    |August 13, 2025
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    Summary
    This summary is machine-generated.

    This study introduces a novel dynamic encryption method using random lasers with tunable spatial coherence. By adjusting voltage, random laser properties change, enabling secure data transmission through visible light patterns.

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    Area of Science:

    • Optics and Photonics
    • Information Security
    • Materials Science

    Background:

    • Random lasers offer unique properties like low spatial coherence for advanced applications.
    • Information encryption demands novel physical phenomena for enhanced security.
    • Liquid crystals provide a tunable medium responsive to external stimuli.

    Purpose of the Study:

    • To propose and demonstrate a dynamic coded encryption approach utilizing the tunable spatial coherence of random lasers.
    • To explore the relationship between applied voltage, liquid crystal properties, and random laser output.
    • To establish a secure information transmission system based on light visibility modulation.

    Main Methods:

    • Modulating the spatial coherence of random lasers by applying variable external voltages to a liquid crystal sample.
    • Utilizing the double-slit interference method to generate multiple visibility outputs.
    • Encoding information into ASCII code using binary or quaternary systems.
    • Real-time voltage modulation for dynamic control of pulse time series.

    Main Results:

    • Reversible tuning of random laser spatial coherence achieved by altering applied voltage.
    • Demonstration of multiple visibility outputs for dynamic coded encryption via double-slit interference.
    • Successful information encryption and transmission using binary/quaternary ASCII encoding.
    • Real-time modulation capability for compact encryption systems.

    Conclusions:

    • The tunable spatial coherence of random lasers is a viable mechanism for dynamic information encryption.
    • Liquid crystal's electro-optic effect provides a controllable pathway to manipulate laser properties for security applications.
    • This approach offers a promising foundation for secure data storage and advanced information encryption systems.