High throughput Laser structuring with Multiscale Periodic feature sizes for Advanced Surface Functionalities (LAMpAS)Thursday (25.06.2020) 11:50 - 12:10 Room 1
Current industrial markets demand highly value-added products offering new features at a low-cost. Bioinspired surface structures, containing features in the nanometre/micrometre scales, offer significant commercial potential for the creation of functionalized surfaces. In this aim, technologies to modify surfaces instead of creating composites or spreading coatings on surfaces can offer new industrial opportunities (e.g. long-term stable surfaces and more eco-friendly processes). In particular, laser surface texturing has shown to be capable of obtaining advanced functionalities, especially when sources operating at nanosecond (short) and picosecond and femtosecond (ultrashort) pulse durations are used. Unlike processing at long laser pulses (microseconds and longer) where repeatability is hindered by the randomness of the melting process, processing with (ultra) short pulses results in increased repeatability of the machining process. For increasing the potential of laser structuring for the design of newly functionalized surfaces, both flexibility and productivity must be significantly improved.
This can be realized by developing high-power ultrafast laser sources as well as strategies and concepts for beam delivery, allowing the fabrication of surface features with high resolution. In this context, this study focuses on the description of the most relevant challenges addressing surface texturing and functionalization using Direct Laser Interference Patterning which will be undertaken in the LAMpAS project (Figure 1), covering the full value chain for laser surface texturing and having access to global markets . Firstly, the preferred architecture for high-power ultrafast laser systems will be described, with focus on the most relevant beam characteristics necessary for obtaining interference as well as considering heat accumulation effects, supported by thermal simulations. Also, a new strategy for beam delivery of interference patterns with a polygon scanner will be introduced. Finally, strategies for real-time monitoring will be discussed, as well as the integration of all deferent sub-systems into a DLIP high-throughput system.
 Lasagni, A. (2017). Laser interference patterning methods: Possibilities for high-throughput fabrication of periodic surface patterns. Advanced Optical Technologies, 6 (3-4), 265–275.
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