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    We developed a long-range heterodyne absolute distance interferometer using a novel optical source. This system precisely measures distances up to 10 meters with high accuracy, outperforming traditional methods.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Precision Measurement

    Background:

    • Traditional interferometers face limitations in range and absolute distance measurement.
    • Frequency combs offer potential for high-precision metrology but require sophisticated generation techniques.

    Purpose of the Study:

    • To demonstrate a heterodyne absolute distance interferometer with macroscopic range.
    • To utilize synchronized cavity-enhanced electro-optic frequency comb generators for precise distance determination.
    • To validate the system's performance against a reference interferometer.

    Main Methods:

    • Employing a heterodyne measurement principle with a frequency comb pair.
    • Generating the frequency comb pair coherently using synchronized cavity-enhanced electro-optic frequency comb generators.
    • Determining absolute distance from interferometric phases of distinct comb modes via a parallel digital lock-in scheme.

    Main Results:

    • Achieved absolute distance measurement with a macroscopic range.
    • Demonstrated agreement within 15 μm compared to a reference HeNe incremental interferometer.
    • Successfully operated the interferometer up to a range of 10 meters.

    Conclusions:

    • The developed heterodyne absolute distance interferometer offers a promising solution for long-range, high-accuracy measurements.
    • The use of synchronized frequency comb generators is effective for absolute distance determination.
    • The system shows excellent agreement with established interferometric techniques.