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Multi-pulse sampling dual-comb ranging method.

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    A novel multi-pulse sampling dual-comb ranging method enhances distance measurements. This technique improves precision for time-of-flight and carrier-wave interferometry, offering faster, more accurate results without sacrificing range.

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    Area of Science:

    • Optical Metrology
    • Precision Engineering
    • Interferometry

    Background:

    • Conventional dual-comb interferometers face limitations in sampling speed and precision.
    • Accurate distance measurements are crucial in various scientific and industrial applications.

    Purpose of the Study:

    • To introduce a multi-pulse sampling dual-comb ranging (MS-DCR) method.
    • To enhance the precision and speed of distance measurements using optical interferometry.

    Main Methods:

    • Generating multiple sampling and signal pulses within a single repetition period using fiber delay.
    • Utilizing multi-pulse linear optical sampling to produce multiple cross-correlation interferograms (IGMs).
    • Implementing IGM multiplication for additional ranging data acquisition.

    Main Results:

    • Achieved simultaneous precision improvement for time-of-flight (TOF) and carrier-wave interferometry (CWI).
    • TOF precision enhanced from 3.85 µm to 1.39 µm; CWI precision improved from 25 nm to 11 nm.
    • Linked TOF to interferometric phase with 0.48 nm precision after 0.5s averaging.

    Conclusions:

    • The MS-DCR method overcomes limitations of conventional linear optical sampling.
    • Enables faster and higher precision distance measurements.
    • Maintains the unambiguity range while improving measurement accuracy.