Hot-dipped galvanized steel is processed with short- and ultrashort-pulsed lasers in air at near-infrared wavelengths with pulse durations ranging from 350 fs to 241 ns. The morphology of the ablated craters (processed over a range of laser fluence levels and a number of laser pulses) is analyzed by confocal laser scanning microscopy and scanning electron microscopy. The ablation threshold of galvanized steel is found to increase with laser pulse durations following a simple power F t h = A . τ B law. Longer pulse durations in the nanosecond regime, as compared to pulse durations in the picosecond and femtosecond regime, result in higher ablation efficiency and energy penetration depth at the cost of surface quality.

中文翻译：

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近红外波长脉冲持续时间对热浸镀锌钢激光诱导材料去除的影响

热浸镀锌钢在空气中用短脉冲和超短脉冲激光加工，近红外波长的脉冲持续时间范围为 350 fs 到 241 ns。通过共聚焦激光扫描显微镜和扫描电子显微镜分析烧蚀坑的形态（在一系列激光通量水平和多个激光脉冲上处理）。发现镀锌钢的烧蚀阈值随着激光脉冲持续时间在简单功率 F th = A 后增加。τ B 律。与皮秒和飞秒范围内的脉冲持续时间相比，纳秒范围内更长的脉冲持续时间以表面质量为代价导致更高的消融效率和能量穿透深度。