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Laser ranging at few-photon level by photon-number-resolving detection.

Zeyu Bao, Yan Liang, Zhiyuan Wang

    Applied Optics
    |July 1, 2014
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    Summary

    Sensitive laser ranging was achieved using photon-number-resolving (PNR) detectors at the few-photon level. This technique enables target recognition and is crucial for advanced LIDAR and 3D imaging applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Remote Sensing Technologies
    • Quantum Optics

    Background:

    • Traditional laser ranging faces limitations in sensitivity and dynamic range, especially in high ambient light conditions.
    • Distinguishing weak optical signals from background noise is critical for advanced remote sensing applications.
    • Photon-counting detectors can suffer from saturation, limiting their effectiveness in certain scenarios.

    Purpose of the Study:

    • To demonstrate sensitive laser ranging at the few-photon level using photon-number-resolving (PNR) detectors.
    • To evaluate the performance of PNR detectors in distinguishing reflected photon pulses from remote targets under sunlight.
    • To explore the potential of PNR detection for recognizing targets with varying reflection coefficients and its application in LIDAR and 3D imaging.

    Main Methods:

    • Utilized photon-number-resolving (PNR) detectors for laser ranging.
    • Set a discrimination threshold at the 5-photon level to distinguish reflected photon pulses.
    • Operated the system in a sunlight environment with an illuminance of 2.5×10^3 lx.
    • Compared detected photon numbers to differentiate between targets with different reflection coefficients.

    Main Results:

    • Successfully demonstrated laser ranging at the few-photon level.
    • Achieved reliable distinction of reflected photon pulses from a non-cooperative remote target in bright sunlight.
    • Effectively recognized two remote targets with different reflection coefficients by analyzing photon counts.
    • PNR detection showed capabilities comparable to linear optical detectors while avoiding photon-counting saturation.

    Conclusions:

    • Photon-number-resolving (PNR) detectors enable sensitive laser ranging at the few-photon level, even in challenging sunlight conditions.
    • This technique offers a robust method for remote target recognition and characterization.
    • PNR detection is a promising technology for advancing ultra-long distance LIDAR and few-photon level 3D imaging.