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Related Experiment Video

Updated: Jun 23, 2026

Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
11:47

Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments

Published on: February 27, 2013

Wide band interferometry for thickness measurement.

Santiago Costantino, Oscar Martinez, Jorge Torga

    Optics Express
    |May 23, 2009
    PubMed
    Summary

    This study introduces wide band interferometry for precise thickness measurements, challenging the conventional use of broad bandwidths. Reducing bandwidth enhances accuracy by mitigating material dispersion distortions.

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    Area of Science:

    • Optical Physics
    • Metrology
    • Materials Science

    Background:

    • White-light interferometry typically uses the widest possible bandwidth for high-resolution distance measurements.
    • Material dispersion, however, introduces distortions that complicate precise thickness measurements.

    Purpose of the Study:

    • To present a novel thickness measurement method using wide band interferometry.
    • To demonstrate how reducing bandwidth can improve precision by avoiding dispersion-related distortions.
    • To highlight the necessity of knowing the frequency dependence of the refractive index for accurate thickness retrieval.

    Main Methods:

    • Development of a wide band interferometry device.
    • Characterization of material dispersion effects on interferometric measurements.
    • Utilizing the device to obtain the group refractive index.

    Main Results:

    • Demonstrated that reducing bandwidth enhances precision in thickness measurements.
    • Showcased the critical role of refractive index frequency dependence for accurate thickness retrieval.
    • Presented real-time observation of silicone oil spreading on a surface as a practical example.

    Conclusions:

    • The established practice of using the widest bandwidth for interferometry is not optimal for thickness measurements due to material dispersion.
    • Wide band interferometry, with optimized bandwidth, offers a more precise method for thickness determination.
    • The developed device accurately measures thickness and obtains the group refractive index, essential for absolute thickness calculations.

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