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Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
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Experimental demonstration of single photon rangefinding using parametric downconversion.

J G Rarity, P R Tapster, J G Walker

    Applied Optics
    |June 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study uses photon pairs from spontaneous parametric down-conversion for low light level rangefinding. The technique achieves 1-meter resolution in seconds, showing potential for high-accuracy measurements.

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    Area of Science:

    • Quantum optics
    • Photonics
    • Metrology

    Background:

    • Photon pairs generated via spontaneous parametric down-conversion (SPDC) offer unique correlation properties.
    • Low light level measurements are challenging due to signal weakness and background noise.

    Purpose of the Study:

    • To demonstrate a novel rangefinding technique utilizing SPDC photon pairs.
    • To achieve precise distance measurements at low light levels.

    Main Methods:

    • Exploiting coincidence detection of photon pairs from SPDC.
    • Measuring the time delay of photons returning from a target.
    • Utilizing a multichannel coincidence counter with a 10 ns gate time.

    Main Results:

    • Achieved 1-meter resolution range estimates with picowatt output power and a target reflectivity of 10(-4).
    • Demonstrated effective rangefinding in low background light conditions.
    • Obtained results within a few seconds.

    Conclusions:

    • The developed photon-pair-based rangefinding method is effective for low light level applications.
    • The technique shows significant potential for achieving millimeter accuracy in surveying and ranging, even in high ambient light.