研究目的
Investigating the influence of laser pulse duration on the laser-induced material removal of hot-dipped galvanized steel.
研究成果
The ablation threshold fluence was found to increase with the laser pulse duration, following a simple power law with an exponent of 0.6. The ablation efficiency also increased with increasing pulse duration but with a smaller exponent value of 0.29. Shorter pulses are better for precise surface texturing due to higher depth resolution, whereas longer pulse durations are better for increased material removal due to higher ablation efficiency.
研究不足
The study is limited to the analysis of laser-induced material removal on galvanized steel at near-infrared wavelengths. The effects of different laser pulse durations on the ablation threshold and efficiency are explored, but the study does not cover other wavelengths or materials.
1：Experimental Design and Method Selection
The study involved processing hot-dipped galvanized steel with short- and ultrashort-pulsed lasers at near-infrared wavelengths, with pulse durations ranging from 350 fs to 241 ns. The morphology of the ablated craters was analyzed using confocal laser scanning microscopy and scanning electron microscopy.
2：Sample Selection and Data Sources
Galvanized steel samples with a zinc coating were used. The samples were commercially produced according to European standard EN10346:2015.
3：List of Experimental Equipment and Materials
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4：Experimental Procedures and Operational Workflow
The laser energy supplied to the surface was varied using a combination of a half-wave plate and a polarizing beam splitter. A pyroelectric detector was used to measure the average laser power incident at the sample. The number of pulses on the same location varied from N = 1 to 50 for the picosecond and nanosecond laser sources.
5：Data Analysis Methods
The ablation threshold and ablation efficiency were determined by analyzing the ablated crater diameters and volumes. The ablation threshold was found to increase with laser pulse durations following a simple power law.
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