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    This study introduces a novel mid-infrared LIDAR system using single-photon counting. It achieves high temporal resolution for precise distance measurements, enabling millimeter-scale target separation.

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    Area of Science:

    • Optics and Photonics
    • Laser Technology
    • Remote Sensing

    Background:

    • Traditional LIDAR systems often face limitations in atmospheric penetration and target specificity.
    • Mid-infrared (MIR) wavelengths offer advantages for certain remote sensing applications.
    • Single-photon detection provides enhanced sensitivity and temporal resolution.

    Purpose of the Study:

    • To develop and demonstrate a single-photon-counting mid-infrared LIDAR system.
    • To achieve high temporal resolution for precise distance measurements.
    • To explore the potential for millimeter-scale target discrimination.

    Main Methods:

    • Utilized intra-cavity frequency mixing in a periodically poled rubidium-doped KTiOPO4 crystal within a Nd:YVO4 laser to up-convert 2.4 µm MIR photons to 737 nm.
    • Employed a Silicon single-photon avalanche photodiode (SPAD) for detecting the up-converted photons.
    • Characterized the system's temporal resolution and dark count rate.

    Main Results:

    • Achieved a temporal resolution of 42 picoseconds.
    • Recorded a dark count rate of 500 Hz, influenced by SPAD performance and ambient light.
    • Successfully demonstrated the detection of two targets separated by only a few millimeters.

    Conclusions:

    • The developed MIR LIDAR system offers high precision and sensitivity.
    • The technique is adaptable for longer wavelengths, contingent on nonlinear crystal transparency.
    • This technology holds promise for advanced remote sensing and metrology applications.