Single track ultra-short pulsed laser ablation on additive manufactured metallic surfacesTuesday (23.06.2020) 17:20 - 17:40 Room 1
Additive Manufacturing (AM), also called 3D printing technologies, have been proved as a method to offer new possibilities for the production of highly complex parts. One new interesting but yet small field of application is the 3D printing of complex optical elements. However, the functional optical performance like the grade of transmission or reflection of such optics is highly dependent on the surface quality. Especially for additive manufactured optics the surface roughness, waviness and microstructure due to the AM process are a big issue. Therefore, like in nearly any AM process chain, post-processes after the printing process are needed to finish and adjust the surface as the customer or application requirements. The studying of laser material processing as a post processing method for additive manufactured optical components is important because as a contactless procedure it allows the surface finishing of complex, thin and thermos-sensitive surfaces. Thus, ultra-short pulsed laser ablation as a very precise ablation technology to generate functionalized surfaces, e.g. by direct laser structuring or direct laser interference patterning, was investigated as a post-processing technology for AM. However, for additive manufactured parts the rough and inhomogeneous surface as well as near surface pores make it challenging to create a homogenous ablation over a larger area. In this work, a parameter study using various laser parameters for single track ablation on additive manufactured AlSi10Mg surfaces is presented. The dependence between the ablated volume, in depth and width, and the set laser parameters are discussed. Here, especially the influence of the adjusted single pulse energy and the pulse repetition rate can be clearly seen in Figure 1. Also near surface pores were opened and caused an inhomogeneous ablation depth even in a single track, see Figure 2. The results of the shown parameter study will be necessary in the further work to generate optical surface structures which means a strategy to deal with near surface pores has to be developed.
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