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High power picosecond laser with 400W average power for large scale applications

机译：高功率皮秒激光，平均功率为400W，适合大规模应用

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摘要

Laser processing is generally known for low thermal influence, precise energy processing and the possibility to ablate every type of material independent on hardness and vaporisation temperature. The use of ultra-short pulsed lasers offers new possibilities in the manufacturing of high end products with extra high processing qualities. For achieving a sufficient and economical processing speed, high average power is needed. To scale the power for industrial uses the picosecond laser system has been developed, which consists of a seeder, a preamplifier and an end amplifier. With the oscillator/amplifier system more than 400W average power and maximum pulse energy 1mJ was obtained. For study of high speed processing of large embossing metal roller two different ps laser systems have been integrated into a cylinder engraving machine. One of the ps lasers has an average power of 80W while the other has 300W. With this high power ps laser fluencies of up to 30 J/cm~2 at pulse repetition rates in the multi MHz range have been achieved. Different materials (Cu, Ni, Al, steel) have been explored for parameters like ablation rate per pulse, ablation geometry, surface roughness, influence of pulse overlap and number of loops. An enhanced ablation quality and an effective ablation rate of 4mm~3/min have been achieved by using different scanning systems and an optimized processing strategy. The max. achieved volume rate is 20mm~3/min.
机译：众所周知，激光加工具有较低的热影响，精确的能量加工以及与硬度和汽化温度无关的烧蚀每种材料的可能性。超短脉冲激光器的使用为制造具有超高加工质量的高端产品提供了新的可能性。为了获得足够且经济的处理速度，需要高的平均功率。为了缩放工业用途的功率，已开发了皮秒激光系统，该系统由播种器，前置放大器和末端放大器组成。使用振荡器/放大器系统时，平均功率超过400W，最大脉冲能量为1mJ。为了研究大型压花金属辊的高速加工，已经将两个不同的ps激光系统集成到圆柱雕刻机中。其中一台ps激光器的平均功率为80W，而另一台为300W。利用这种高功率ps，在多MHz范围内以脉冲重复频率实现了高达30 J / cm〜2的激光通量。已经探索了不同材料（铜，镍，铝，钢）的参数，例如每个脉冲的烧蚀率，烧蚀几何形状，表面粗糙度，脉冲重叠的影响和回路数。通过使用不同的扫描系统和优化的加工策略，可以获得更高的烧蚀质量和4mm〜3 / min的有效烧蚀率。最高达到的体积率为20mm〜3 / min。

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