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Photon-counting phase-stabilized dual-comb ranging.

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    Optics Express
    |November 22, 2024
    PubMed
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    Photon-counting dual-comb ranging (DCR) achieves unprecedented detection sensitivity, enabling precise distance measurements for applications like spacecraft formation flying. This breakthrough overcomes previous limitations in ranging distance and target materials.

    Area of Science:

    • Optical Metrology
    • Precision Measurement
    • Photon Counting Technology

    Background:

    • Dual-comb ranging (DCR) offers superior performance over traditional methods.
    • Current DCR is limited by detection sensitivity, restricting applications.
    • Optical asynchronous linear sampling limits ranging distance and target materials.

    Purpose of the Study:

    • To enhance DCR detection sensitivity using photon counting.
    • To enable absolute distance measurement despite fiber-length variations.
    • To achieve femtowatt-level detection for DCR.

    Main Methods:

    • Utilized photon-counting for enhanced detection sensitivity.
    • Implemented an orthogonal polarization interferometry-arm configuration.
    • Developed a reference-arm based photon-counting trigger protocol.

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    Last Updated: Jun 6, 2025

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    Main Results:

    • Achieved femtowatt-level detection sensitivity.
    • Demonstrated phase-stable DCR with the lowest detection power to date.
    • Obtained 22 µm time-of-flight and 8 nm multi-wavelength interferometry precision with 18 femtowatt average power.

    Conclusions:

    • Photon-counting DCR significantly improves detection sensitivity.
    • The proposed system enables precise absolute distance measurements for challenging scenarios.
    • This technology is crucial for large-scale space applications and hard target measurement.