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Distribution and avoidance of debris on epoxy resin during UV ns-laser scanning processes

: Veltrup, M.; Lukasczyk, T.; Ihde, J.; Mayer, B.


Applied surface science 440 (2018), pp.1107-1115
ISSN: 0169-4332
Journal Article
Fraunhofer IFAM ()

In this paper the distribution of debris generated by a nanosecond UV laser (248 nm) on epoxy resin and the prevention of the corresponding re-deposition effects by parameter selection for a ns-laser scanning process were investigated. In order to understand the mechanisms behind the debris generation, in-situ particle measurements were performed during laser treatment. These measurements enabled the determination of the ablation threshold of the epoxy resin as well as the particle density and size distribution in relation to the applied laser parameters. The experiments showed that it is possible to reduce debris on the surface with an adapted selection of pulse overlap with respect to laser fluence. A theoretical model for the parameter selection was developed and tested. Based on this model, the correct choice of laser parameters with reduced laser fluence resulted in a surface without any re-deposited micro-particles.