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    Researchers extended imaging range in turbid conditions using time-gated holography and coherent processing. This novel method significantly reduces laser illumination power for enhanced visibility in challenging environments.

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    Area of Science:

    • Optics and Photonics
    • Imaging Science
    • Photonics for Remote Sensing

    Background:

    • Imaging through scattering media like turbid water and fog is crucial for navigation and situational awareness.
    • Current long-range imaging in these conditions relies on time-gated active illumination to select ballistic photons.

    Purpose of the Study:

    • To extend the imaging range in turbid environments beyond current limitations.
    • To investigate the efficacy of time-gated holography combined with multi-frame processing for enhanced imaging.

    Main Methods:

    • Utilized time-gated holography to capture complex optical fields.
    • Employed digital holographic processing to retrieve complex fields from captured frames.
    • Implemented coherent addition of multi-frame complex fields, rather than simple intensity summation.

    Main Results:

    • Successfully demonstrated imaging through significant volumes of turbid water (13 one-way attenuation lengths) and fog (13.6 one-way attenuation lengths).
    • Achieved comparable imaging ranges to traditional time-gated systems.
    • Required 20x less laser illumination power compared to traditional time-gated systems for the same imaging range.

    Conclusions:

    • Time-gated holography with coherent multi-frame processing offers a significant advancement in imaging through scattering media.
    • This technique provides extended imaging ranges with substantially reduced illumination power, improving efficiency and safety.