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    Area of Science:

    • Physics
    • Metrology
    • Optical Engineering

    Background:

    • Accurate measurement of minute displacements is crucial for scientific research and technology.
    • Doppler shift in reflected light offers a method to convert displacement into frequency measurements.
    • Existing interferometric techniques can be sensitive to phase noise.

    Purpose of the Study:

    • To develop a highly sensitive device for measuring extremely small displacements.
    • To convert displacement measurements into frequency measurements using Doppler shifts.
    • To enhance robustness against noise in displacement sensing.

    Main Methods:

    • Utilizing the Doppler shift generated by light reflected from an oscillating mirror.
    • Developing a sensitive device to measure microHertz/Hertz Doppler frequency shifts.
    • Operating the device over multiple orders of magnitude of Doppler frequency range.

    Main Results:

    • Achieved measurement of tens of femtometer displacements for a 2 Hz oscillating mirror.
    • Demonstrated position sensitivity orders of magnitude better than other techniques.
    • Device exhibits phase insensitivity, leading to enhanced noise robustness.

    Conclusions:

    • The developed device offers superior position sensitivity for measuring small displacements.
    • The phase-insensitive nature makes the technique robust and practical for various applications.
    • This method advances the field of precision metrology and fundamental studies.