Zinc and zinc-coated steel is processed with a picosecond laser source at a wavelength of 1030 and 515 nm to investigate the effect of time between consecutive pulses, i.e. pulse repetition rate on the laser ablation efficiency, in terms of maximum achievable depth of the ablated crater, material removal rate and processing quality. With increasing pulse repetition rate up to 40 kHz and number of pulses on the same location, material removal rate increases due to heat accumulation, while the maximum achievable depth decreases due to particle shielding for both zinc and zinc coated steel. It was found that, unlike the zinc-coated sample, both material removal rate and achievable depth is enhanced for bulk zinc at high repetition rates, due to a greater degree of heat accumulation than particle shielding. Using a numerical heat flow model, it is shown that the difference between bulk zinc and zinc-coated steel stems from the steel substrate that effectively acts as a heat sink for the absorbed energy in the zinc coating, inhibiting a higher degree of heat accumulation.

用皮秒激光源在1030和515 nm的波长下对锌和镀锌钢进行处理，以研究最大脉冲深度对连续脉冲之间的时间影响，即脉冲重复频率对激光烧蚀效率的影响。弹坑，材料去除率和加工质量。随着高达40 kHz的脉冲重复频率的增加和同一位置上的脉冲数的增加，由于热量的积累，材料的去除率增加，而由于锌和镀锌钢的颗粒屏蔽，最大可达到的深度减小。已发现，与镀锌样品不同，由于散发的锌的热积累程度高于微粒屏蔽，因此在高重复率下，块状锌的材料去除率和可达到的深度均得到提高。使用数值热流模型，