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Related Experiment Video

Updated: Dec 9, 2025

Implementation of a Reference Interferometer for Nanodetection
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A compact high-precision periodic-error-free heterodyne interferometer.

Ki-Nam Joo, Erin Clark, Yanqi Zhang

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |September 9, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a compact heterodyne interferometer with picometer-level displacement sensitivity. The novel design minimizes errors and environmental disturbances for enhanced stability and performance.

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    Area of Science:

    • Optical physics
    • Metrology
    • Interferometry

    Background:

    • Heterodyne interferometers are crucial for high-precision measurements.
    • Environmental factors and optical mixing can limit sensitivity and introduce errors.
    • Existing systems may lack sufficient stability and periodic-error-free performance.

    Purpose of the Study:

    • To design and demonstrate a compact heterodyne interferometer.
    • To achieve picometer-level displacement sensitivities above 100 MHz in air.
    • To minimize periodic errors and enhance rejection of environmental disturbances.

    Main Methods:

    • Utilized a compact heterodyne interferometer design with spatially separated beams.
    • Maximized common-mode optical laser beam paths for environmental disturbance rejection.
    • Conducted stationary and dynamic measurements to assess short- and long-term stabilities.

    Main Results:

    • Achieved picometer-level displacement sensitivities (3 pm).
    • Demonstrated higher thermal stability by a factor of two compared to a commercial system.
    • Verified periodic-error-free performance.

    Conclusions:

    • The developed compact heterodyne interferometer offers superior sensitivity and stability.
    • The design effectively mitigates frequency/polarization mixing and environmental disturbances.
    • This technology advances precision measurement capabilities in metrology.