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Comparative analysis of the potential of state-of-the-art lasers and new prototypic high-power beam sources for cutting nonmetals
Journal of Laser Applications ( IF 2.1 ) Pub Date : 2020-05-01 , DOI: 10.2351/7.0000085
Alexander Mickan 1 , Michael Rose 1, 2 , Jan Hauptmann 1 , Andreas Wetzig 1 , Christoph Leyens 1, 3
Affiliation  

At Fraunhofer IWS Dresden, different, partially prototypic high-power continuous wave (cw) beam sources for the remote laser processing of nonmetals with galvanometric-driven scanner systems are available. The emitted wavelengths of the lasers cover the range from visible light to mid-infrared. A spectroscopic analysis was performed to gain insight into the processability of typical nonmetal materials with single wavelengths. The wavelength-depending absorption was calculated based on the measured reflectivity and transmissivity of the selected materials. Relating to these results, the theoretic potential of the beam sources was verified in a comparable cutting research. The investigated work pieces are representatives of the groups of thermoplastics and thermosets, fiber-reinforced polymers, glasses, natural fiber textiles, and cellulosic based materials. The laser systems were divided in two groups for the investigation. To get a reference of the processability with state-of-the-art cw systems, a CO2 laser with a wavelength of 10.6 μm and a solid-state Yb:YAG fiber laser with 1.07 μm were used. The new prototypic beam sources were a green laser with a wavelength of 0.515 μm, a CO laser with a range of 5.3–5.8 μm, and a CO2 laser with 9.3 μm in a power range from 1 to 1.5 kW. Differences in the possible focusability are caused by the wavelengths and given beam qualities. For a direct comparison, these differences needed to be compensated. To get comparable intensities, the spot diameter in the working distance for each laser was set to 250 μm. This allows to process the materials with almost the same intensities. Since the laser sources with the short wavelengths offer a better focusability, experiments with the smallest possible focus diameters for the used optics were performed to get an optimized ablation result. Finally, the aim of the research was to evaluate the suitability of the available beam sources for new fields of application. The latest results of experimental and theoretical investigations on the remote laser processing of nonmetals with a wide range of laser wavelength will be presented and discussed.

中文翻译:

最先进激光器和新型原型高功率光束源用于非金属切割的潜力比较分析

在 Fraunhofer IWS Dresden,可以使用不同的、部分原型的高功率连续波 (cw) 光束源,用于使用电流驱动扫描仪系统对非金属进行远程激光加工。激光的发射波长涵盖了从可见光到中红外的范围。进行光谱分析以深入了解具有单一波长的典型非金属材料的可加工性。基于所选材料的测量反射率和透射率计算依赖于波长的吸收。与这些结果相关,光束源的理论潜力在可比的切割研究中得到验证。研究的工件是热塑性塑料和热固性塑料、纤维增强聚合物、玻璃、天然纤维纺织品、和纤维素基材料。激光系统分为两组进行研究。为了获得最先进连续波系统的可加工性参考,使用了波长为 10.6 μm 的 CO2 激光器和波长为 1.07 μm 的固态 Yb:YAG 光纤激光器。新的原型光束源是波长为 0.515 μm 的绿色激光器、范围为 5.3-5.8 μm 的 CO 激光器和功率范围为 1 至 1.5 kW 的 9.3 μm 的 CO2 激光器。可能的可聚焦性的差异是由波长和给定的光束质量引起的。为了直接比较,需要补偿这些差异。为了获得可比较的强度,每个激光器工作距离内的光斑直径设置为 250 μm。这允许以几乎相同的强度处理材料。由于具有短波长的激光源提供更好的聚焦性,因此对所使用的光学器件进行了尽可能小的聚焦直径的实验,以获得优化的烧蚀结果。最后,研究的目的是评估可用光束源对新应用领域的适用性。将介绍和讨论对大范围激光波长的非金属进行远程激光加工的实验和理论研究的最新结果。
更新日期:2020-05-01
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