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All-optical coherent pulse compression for dynamic laser ranging using an acousto-optic dual comb.

Vincent Billault, Vicente Durán, Carlos R Fernández-Pousa

    Optics Express
    |July 16, 2021
    PubMed
    Summary

    A new dynamic laser ranging platform uses optical pulse compression for millimeter resolution and 20 µm precision. This simple system enables acoustic-rate dynamic measurements and extended range telemetry.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Signal Processing

    Background:

    • Traditional laser ranging systems face limitations in dynamic measurement capabilities and range ambiguity.
    • Developing high-resolution, high-precision ranging systems is crucial for advanced applications in various scientific and industrial fields.

    Purpose of the Study:

    • To demonstrate a novel, simple dynamic laser ranging platform.
    • To achieve high range resolution and precision using optical coherent pulse compression.
    • To enable dynamic measurements and extend the ambiguity range for practical applications.

    Main Methods:

    • Utilized analog all-optical coherent pulse compression of modulated optical waveforms.
    • Employed a bidirectional acousto-optic frequency shifting loop to generate a dual-comb photonic signal.

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  • Integrated a continuous wave (CW) laser, standard telecom components, and low-frequency electronics.

    • Main Results:

    • Achieved a range resolution of a few millimeters with a 24 GHz dual-comb spectral bandwidth.
    • Demonstrated a precision of 20 µm for an integration time of 20 ms.
    • Enabled dynamic measurements at acoustic rates, including phase-sensitive measurements and Doppler shift velocimetry.
    • Extended the ambiguity range to approximately 20 m using perfect correlation phase sequences.

    Conclusions:

    • The developed platform offers a simple yet powerful solution for dynamic laser ranging.
    • The system's high resolution, precision, and dynamic capabilities make it suitable for advanced metrology.
    • Low peak power quasi-continuous waveforms facilitate potential long-range telemetry and reflectometry applications.