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Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
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Wavelength-scanning white-light interferometry with a 3x3 coupler-based interferometer.

Yi Jiang1

  • 1Department of Optical Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing, China. bitjy@bit.edu.cn

Optics Letters
|August 19, 2008
PubMed
Summary
This summary is machine-generated.

A new white-light interferometer using a 3x3 coupler retrieves absolute optical path difference. This method shows agreement with Fourier transform techniques and demonstrates linear properties.

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Area of Science:

  • Optical Engineering
  • Interferometry
  • Metrology

Background:

  • Accurate measurement of optical path difference is crucial in various scientific and industrial applications.
  • Traditional interferometry methods can face limitations in determining absolute path differences.

Purpose of the Study:

  • To present a novel white-light interferometry system for absolute optical path difference (OPD) retrieval.
  • To demonstrate the system's performance and compare it with existing techniques.

Main Methods:

  • Development of a white-light interferometer utilizing a 3x3 fiber optic coupler.
  • Experimental implementation and measurement of phase changes.
  • Comparison with Fourier transform white-light interferometry (FTWLI).

Main Results:

  • The developed interferometer successfully retrieves the absolute optical path difference.
  • Measured phase changes are in strong agreement with those obtained via FTWLI.
  • The linear property of the novel interferometer was experimentally validated.

Conclusions:

  • The 3x3 coupler-based white-light interferometer is a viable tool for absolute OPD measurement.
  • The system offers comparable accuracy to established FTWLI methods.
  • The demonstrated linearity supports its potential for precise metrological applications.