Monitoring and Maintaining Laser Surface Texture Quality Based on Acoustic and Optical Process Emissions during Direct Laser Interference Patterning
2025
Direct laser interference patterning (DLIP) is a promising technique for fabricating periodic surface structures on large areas, but controlling process quality can be challenging due to laser power fluctuations. This study presents a novel monitoring approach using acoustic and optical emissions to diagnose and correct these fluctuations during DLIP structure fabrication. Experiments are conducted using a nanosecond‐pulsed IR laser to create 6 μm periodic microstructures on stainless steel. Significant laser powe…