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Related Concept Videos

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

771
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
771

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High-precision dual-comb ranging based on two-color nonlinear asynchronous optical sampling.

Yanqing Shi, Churan Zhang, Ziye Wang

    Optics Letters
    |November 4, 2025
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    Summary
    This summary is machine-generated.

    Dual-comb ranging (DCR) achieves high-precision distance measurement using nonlinear asynchronous optical sampling (ASOPS). This new method uses low echoed laser power for precise measurements, even for moving objects.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Laser Physics

    Background:

    • Dual-comb ranging (DCR) offers high-precision distance measurement capabilities.
    • Nonlinear asynchronous optical sampling (ASOPS) based DCR is suitable for field applications due to relaxed coherence requirements.
    • Conventional nonlinear frequency conversion in DCR typically demands high laser power.

    Purpose of the Study:

    • To introduce a low-power dual-comb ranging method using two-color nonlinear ASOPS.
    • To leverage efficient Type-0 phase matching in periodically poled lithium niobate (PPLN) for enhanced nonlinear frequency conversion.
    • To demonstrate high-precision distance measurements with reduced laser power.

    Main Methods:

    • Employed a two-color nonlinear ASOPS approach with Er-fiber lasers at 1540 nm and 1580 nm.
    • Utilized a periodically poled lithium niobate (PPLN) crystal for efficient sum frequency generation via Type-0 phase matching.
    • Performed background-free time-of-flight (ToF) measurements using a 780 nm sum frequency signal.

    Main Results:

    • Achieved a ranging precision of less than 3 µm.
    • Demonstrated this precision with a short acquisition time of 100 ms.
    • Required only 5 µW of echoed laser power.
    • Confirmed dynamic performance by tracking a moving translation stage.

    Conclusions:

    • The developed DCR method significantly reduces the required laser power for high-precision distance measurements.
    • This technique offers a practical and efficient solution for field applications requiring accurate ranging.
    • The low-power, high-precision performance opens possibilities for miniaturized and portable ranging systems.