Abstract
Ablation of bulk polycrystalline zinc in air is performed with single and multiple picosecond laser pulses at a wavelength of 1030 nm. The relationships between the characteristics of the ablated craters and the processing parameters are analyzed. Morphological changes of the ablated craters are characterized by means of scanning electron microscopy and confocal laser scanning microscopy. Chemical compositions of both the treated and untreated surfaces are quantified with X-ray photoelectron spectroscopy. A comparative analysis on the determination of the ablation threshold using three methods, based on ablated diameter, depth and volume is presented along with associated incubation coefficients. The single pulse ablation threshold value is found to equal 0.21 J/cm2. Using the calculated incubation coefficients, it is found that both the fluence threshold and energy penetration depth show lesser degree of incubation for multiple laser pulses.
Highlights
Laser surface texturing is a commonly used surface engineering process to increase surface functionality [1]
The values obtained from other sources for pure zinc [32, 33], zinc oxide (ZnO) [34], aluminum [35] and aluminum oxide
No significant chemical changes were observed with fluence variations, morphological observation shows that a shift from disc-shaped to splash-dominated crater geometry around 10 J/cm2 marks the boundary between these two regimes
Summary
Laser surface texturing is a commonly used surface engineering process to increase surface functionality [1]. Since quantitative analysis of surface texturing depends on the morphological characterization of laser ablated craters, the determination of the threshold fluence using geometric features has been widely applied [13,14,15,16,17,18,19,20]
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