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New approach for monitoring a direct laser interference patterning process using a combination of an infrared camera and a diffraction measurement system

  • Schröder, Nikolai
  • Teutoburg-Weiss, Sascha
  • Vergara, Germán
  • Lasagni, Andrés-Fabián
Publication Date
Jan 01, 2021
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Recently, process monitoring emerges as a breakthrough technology in industrial laser machines applications to enhance process stability and economic efficiency while ensuring high-quality processing parts and significantly reducing scrap rate. Furthermore, the latest advances in monitoring systems open a broad range of new opportunities to increase the capabilities of laser surface structuring. In this study, stainless steel and aluminum substrates are structured with a line-like geometry by Direct Laser Interference Patterning. A high-speed infrared camera is used to detect the thermal effects throughout the laser process. Simultaneously, a diffraction measurement system is implemented to analyze the quality of the fabricated periodic patterns by comparing the diffraction order characteristics. This specific combination of the systems allows a remarkably high-performance process monitoring and quality assurance. The obtained results reveal a correlation between the signals detected by the infrared camera and the intensity of the diffraction orders recorded with the quality of the surface reached.

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