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Three-dimensional non-destructive optical evaluation of laser-processing performance using optical coherence

Youngseop Kim1, Eun Seo Choi1, Wooseop Kwak1

  • 1Laser Imaging Laboratory and Department of Physics, Chosun University, 375 Seosuk-dong, Dong-gu, Gwangju 501-759, Republic of Korea.

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|June 17, 2014
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Summary

Optical coherence tomography (OCT) non-destructively evaluates laser processing by imaging material pits. This method shows potential for real-time monitoring of laser processing performance.

Keywords:
Laser markingNon-destructive diagnosisOptical coherence tomography (OCT)

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Metrology

Background:

  • Laser processing is crucial for manufacturing, requiring precise control.
  • Evaluating laser-induced features like pits and rims is essential for quality assurance.
  • Conventional methods like scanning electron microscopy (SEM) can be time-consuming and destructive.

Purpose of the Study:

  • To demonstrate optical coherence tomography (OCT) as a non-destructive tool for evaluating laser processing.
  • To compare OCT imaging with conventional SEM for analyzing laser-induced pits.
  • To assess the feasibility of OCT for monitoring laser processing performance.

Main Methods:

  • Imaging laser-processed pits using both OCT and SEM.
  • Analyzing and comparing geometrical characteristics derived from OCT and SEM images.
  • Evaluating the correlation between processing conditions and pit morphology.

Main Results:

  • OCT successfully imaged the features of laser-induced pits and rims.
  • Geometrical analysis of pits showed comparable results between OCT and SEM.
  • The study verified the potential of OCT for non-destructive evaluation.

Conclusions:

  • Optical coherence tomography is a viable non-destructive diagnostic tool for laser processing.
  • OCT offers a promising alternative for real-time monitoring and quality control.
  • Further research can explore OCT's application in diverse laser-based manufacturing processes.