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…

Direct laser interference patterning (DLIP) utilises the interference from two or more beams for texturing large surfaces at high processing speeds. Using this technique for ultrashort-pulsed (USP) laser welding would aid in scaling this process for industry. We demonstrate the first successful DLIP USP laser welding of fused silica glass to both silicon and to stainless steel. Our results indicate that a 2-beam DLIP configuration is best suited to ensure a successful weld is formed. Shear strength and stress-indu…

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The increasing bacterial resistance to antibiotics is prompting research into new approaches to design bacterial repellent surfaces. This work investigated the hot embossing of sub-micron direct laser interference patterning (DLIP) and laser-induced periodic surface structures (LIPSS) textures from stainless steel onto polypropylene samples to achieve bacterial repellent properties. Staphylococcus aureus bacteria were adhered to the textured surfaces, and adhered bacterial counts were compared to untextured polypr…

Surface roughness measurement is an integral part of the characterization of microtextured surfaces. Multiple established software packages offer the calculation of roughness parameters according to ISO 25178. However, these packages lack a specific set of features, which we hope to address in this work. Firstly, they often lack or have limited capabilities for automated and batch analysis, making it hard to integrate into other applications. Secondly, they are often proprietary and therefore restrict access to so…