In this work, the use of an innovative, compact femtosecond laser operating in the GHz regime for laser ablation and micro-texturing is investigated and discussed. The processing performances of burst mode for pulses shot in the GHz regime are numerically simulated. The proposed ablation model is based on the two-temperature model and considers, in a simplified way, the effect of plasma. The numerical results are compared in terms of ablation depth with experimental investigations on stainless steels. The numerical outputs allow an understanding of the influence of different process parameters and support the selection of the operating window where GHz laser became competitive with traditional ultrashort laser sources in the MHz regime.
Laser-Induced Periodic Surface Structures (LIPSS) are normally created to induce peculiar surface properties but, despite their interesting properties, LIPSS generation has a main drawback which is its low throughput rate. This limits applications on large surfaces. In this work, adaptive optics is used to increase productivity, and processing tests are conducted on stainless steel and nickel-titanium alloy as examples of surfaces for biomedical and luxury applications. The use of a deformable mirror to dynamically control the wavefront and the spatial energy distribution at the focal point of a picosecond laser is introduced and discussed. The shape of the focused beam is theoretically predicted and experimentally investigated with a sub-micron, high-resolution beam profiler. The shape obtained in the focus can be dynamically controlled at the level of the single vector to be scanned. Results confirm that this method can overcome the aforementioned limitations and significantly increase the throughput rate in LIPSS generation.
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