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Implementation of a Reference Interferometer for Nanodetection
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Compact auto-aligning interferometers with picometer precision.

Xiang Lin, Peng Qiu, Yurong Liang

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    |June 10, 2024
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    Summary
    This summary is machine-generated.

    Researchers developed a compact, auto-aligning interferometer for precise translation measurements. This device achieves picometer precision and a wide angular range, enhancing metrology applications.

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    Area of Science:

    • Optics and Photonics
    • Metrology
    • Precision Engineering

    Background:

    • Accurate translation measurement is crucial for advanced scientific and industrial applications.
    • Existing interferometers often face challenges with alignment stability and angular working range.
    • The need for compact, high-precision sensors with robust alignment is growing.

    Purpose of the Study:

    • To introduce a novel compact interferometer with auto-alignment capabilities.
    • To demonstrate picometer-level precision in translation measurements.
    • To achieve a wide angular working range for versatile applications.

    Main Methods:

    • Design of a quasi-monolithic, all-glass sensor head (20x10x10 mm³).
    • Implementation of secondary reflection from a corner reflector for automatic beam alignment.
    • Utilizing interferometric principles for displacement sensing.

    Main Results:

    • Achieved displacement sensitivity below 1 picometer/Hz^(1/2) above 1 Hz.
    • Demonstrated a wide angular working range of ±200 milliradians.
    • The compact design ensures stable alignment during movement.

    Conclusions:

    • The developed auto-aligning interferometer offers unprecedented precision and angular range in a compact form factor.
    • This technology has the potential to significantly enhance laser ranging, optical seismometry, precision manufacturing, and metrology.
    • The quasi-monolithic design contributes to the sensor's stability and performance.