Femtosecond laser (Pharos, Light Conversion) with the possibility to produce bi-burst pulses with a repetition rate of 64.5 MHz or/and 4.88 GHz was used to structure copper and steel samples. Ablation efficiency and quality were studied by varying number of pulses per burst in conventional burst regimes and in the bi-burst mode. The comparison of burst, bi-burst and single-pulse ablation efficiencies was done for beam-size-optimised regimes, showing the real advantages and disadvantages of milling and drilling processing approaches.
Surfaces inspired by nature and their replication find great interest in science, technology, and medicine due to their unique functional properties. This research aimed to develop an efficient laser milling technology using single-pulse- and burst-modes of irradiation to replicate bio-inspired structures over large areas at high speed. The ability to form the trapezoidal-riblets inspired by shark skin at high production speeds while maintaining the lowest possible surface roughness was demonstrated.
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