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Improved algorithm for multiwavelength single-shot interferometric surface profiling: speeding up the

Keisuke Nakata1, Masashi Sugiyama, Katsuichi Kitagawa

  • 1Tokyo Institute of Technology, Tokyo, Japan. nakata@sg.cs.titech.ac.jp

Applied Optics
|June 14, 2013
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Summary
This summary is machine-generated.

This study introduces an improved multiwavelength-integrated local model fitting (MI-LMF) method. The new approach enhances computational efficiency by approximately 10 times while maintaining measurement accuracy for surface profiling.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Surface Science

Background:

  • Local model fitting (LMF) is a fast, accurate, non-destructive surface profiling technique.
  • Existing extensions like MM-LMF and MI-LMF have trade-offs between computational efficiency and accuracy.
  • MM-LMF is fast but prone to phase unwrapping errors; MI-LMF is accurate but computationally expensive.

Purpose of the Study:

  • To improve the computational efficiency of the multiwavelength-integrated local model fitting (MI-LMF) method.
  • To maintain the high measurement accuracy of MI-LMF while reducing computational cost.
  • To develop a faster and accurate surface profiling algorithm.

Main Methods:

  • Combining the multiwavelength-matched LMF (MM-LMF) and MI-LMF methods.
  • Implementing local information sharing between MM-LMF and MI-LMF.
  • Experimental validation of the proposed hybrid method.

Main Results:

  • The proposed method achieves a speed improvement of approximately 10 times compared to the original MI-LMF.
  • Measurement accuracy comparable to the original MI-LMF is maintained.
  • Demonstrated feasibility through actual experiments.

Conclusions:

  • The hybrid MI-LMF and MM-LMF method offers a significant advancement in computational efficiency for surface profiling.
  • This approach successfully balances speed and accuracy in interferometric measurements.
  • The developed technique provides a more practical solution for high-speed, accurate surface metrology.