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Related Experiment Video

Updated: Jun 11, 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

A "virtual-interferometer" technique for surface metrology.

Scott M Jobling1, Paul G Kwiat

  • 1Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 1406 W Green Street, Urbana, IL 61801, USA. jobling2@illinois.edu

Optics Express
|July 1, 2010
PubMed
Summary
This summary is machine-generated.

This study presents a new method for precise surface metrology using phase measurements and a least-squares algorithm. The technique corrects for system aberrations, enabling accurate surface profiling of optics.

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Area of Science:

  • Optical Engineering
  • Metrology
  • Surface Science

Background:

  • Wavefront-based systems are crucial for optical testing.
  • Accurate surface metrology is essential for high-performance optics.
  • Existing methods may struggle with static system aberrations.

Purpose of the Study:

  • To develop a novel technique for aberration-corrected surface metrology.
  • To integrate this technique into existing wavefront-feedback systems.
  • To achieve absolute surface profile measurements.

Main Methods:

  • Utilizing multiple phase measurements to derive surface gradients.
  • Employing orthogonal object displacements between measurements.
  • Applying a least-squares algorithm for surface reconstruction.

Main Results:

  • Successfully demonstrated aberration-corrected surface metrology.
  • Achieved surface profiling of test optics with 20-40 nm RMS error.
  • Identified angular crosstalk as a factor limiting accuracy.

Conclusions:

  • The developed technique offers a robust method for absolute surface metrology.
  • It effectively removes static system aberrations.
  • This approach enhances the precision of surface characterization in optical systems.