The GHz burst mode femtosecond (fs) laser pulses have attracted considerable attention because they can perform better quality and higher efficiency ablation compared to the conventional irradiation scheme of fs pulses (single-pulse mode). Recently, we have demonstrated that the GHz burst mode fs laser pulses can create two-dimensional (2D) periodic surface structures (LIPSS) on Si surfaces. In this paper, we extend the GHz burst mode fs laser processing to form LIPSS on Ti plates. Our aim was to further investigate the more detailed mechanism and explore practical applications. Although the material characteristics of Ti are significantly different from Si, the GHz burst mode fs laser pulses can also create 2D-LIPSS. Then, mesenchymal stem cells cultured on the formed 2D-LIPSS were found to exhibit different behavior on 1D-LIPSS as compared with bare Ti surfaces.
Femtosecond laser pulses with GHz burst mode, which consists of a series of femtosecond laser pulse trains with a pulse interval of several hundred ps is expected to achieve high-efficiency and high-quality materials processing that cannot be performed by the conventional irradiation scheme. In this paper, we show the results of GHz burst mode ablation of silicon and copper. We further extend the GHz burst mode to surface nanostructuring for formation of novel two-dimenional laser-induced periodic surface structures (LIPSS), two-photon plolymerization (TPP) for improvement of fabrication resolution, and laser-induced plasma-assisted ablation (LIPAA) for high-quality microfabrication of transparent materials.
In the last several years, femtosecond laser processing using GHz burst mode, which consists of the ultrashort laser pulse (intra-pulse) trains with the pulse-to-pulse interval of several hundred ps, has attracted much attention, as it can achieve higher-processing quality with enhanced processing efficiency than the conventional femtosecond laser irradiation scheme (single-pulse mode). However, most of the research using the GHz burst mode was aimed at ablation. In this study, we extend the GHz burst mode femtosecond laser processing to the formation of laser-induced periodic surface structures (LIPSS) to explore the possibility of novel nanostructuring, over the single-pulse mode.
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