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Related Concept Videos

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Multi-mode interferometric measurement system based on wavelength modulation and active vibration resistance.

Tong Guo, Xinyuan Guo, Yangyang Wei

    Optics Express
    |November 23, 2021
    PubMed
    Summary

    This study introduces a novel multi-mode optical interferometer that overcomes environmental noise using wavelength modulation and active vibration resistance. The system accurately measures micro- and nanoscale surface topography on various surfaces, even under vibration.

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    Area of Science:

    • Metrology and Surface Science
    • Optical Engineering
    • Nanotechnology

    Background:

    • Optical interferometers are crucial for micro- and nanoscale surface topography measurement.
    • Environmental noise significantly degrades the accuracy and resolution of conventional interferometers.
    • Existing systems often lack adaptability for different surface types and real-time adjustments.

    Purpose of the Study:

    • To develop a robust multi-mode interferometric measurement system resistant to environmental noise.
    • To enhance measurement accuracy and resolution for micro- and nanoscale surface topography.
    • To support adaptable measurements for both structured and smooth continuous surfaces.

    Main Methods:

    • Implementation of a multi-mode interferometric system utilizing wavelength modulation.
    • Integration of active vibration resistance technology to mitigate environmental disturbances.
    • Development of two distinct measurement modes: wavelength-scanning interferometry and wavelength-tuning interferometry.
    • Real-time measurement of optical path difference for system adjustment and accuracy improvement.

    Main Results:

    • The proposed system demonstrated high accuracy in measuring 1.806 µm and 43.2 nm step height standards.
    • Measurements in both wavelength-scanning and wavelength-tuning modes showed excellent agreement with calibrated values.
    • The system maintained measurement integrity under varying degrees of environmental vibration.

    Conclusions:

    • The developed multi-mode interferometric system effectively overcomes environmental noise challenges.
    • The system offers versatile and accurate micro- and nanoscale surface topography measurements for diverse applications.
    • Active vibration resistance and real-time optical path difference measurement significantly improve metrological performance.