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首页> 外文会议>Laser applications in microelectronic and optoelectronic manufacturing (LAMOM) XIX >Ablation dynamics and shock wave expansion during laser processing of CFRP with ultrashort laser pulses
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Ablation dynamics and shock wave expansion during laser processing of CFRP with ultrashort laser pulses

机译：超短激光脉冲CFRP激光加工过程中的烧蚀动力学和冲击波扩展

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摘要

Carbon fibre reinforced plastics (CFRP) have a large potential in the automotive lightweight construction due to their low density and high mechanical stability. Compared with today's laser processing methods of metals the main issues in laser processing of CFRP are the very differing thermal, optical and mechanical properties of the components. To understand the process in detail, the ablation process of CFRP with ultrashort laser pulses was investigated. The shock wave and the vapor resulting from processing with single laser pulses were recorded. Shadow photography and luminescence photography with an ultra-high-speed camera was used to show the ablation process with a temporary resolution of up to 3 ns. The field of view was 250 μm × 250 μm. An ultrashort laser pulse with pulse duration of 4 ps and a wavelength of 800 nm was focused onto the workpiece. The energy content of the shock wave was calculated from the resulting images. The energy content of the shock wave was about 20 % of the incident energy and the speed of propagation of the shock wave was more than 2000 m/s. The high intensities in the range of 10~(13) W/cm~2 lead to formation of a plasma plume which was clearly seen in the shadow photography images.
机译：碳纤维增强塑料（CFRP）由于其低密度和高机械稳定性而在汽车轻量化结构中具有巨大潜力。与当今的金属激光加工方法相比，CFRP激光加工的主要问题是部件的热，光学和机械性能差异很大。为了详细了解该过程，研究了超短激光脉冲对CFRP的烧蚀过程。记录由单个激光脉冲处理产生的冲击波和蒸气。使用超高速相机进行的阴影摄影和发光摄影显示了高达3 ns的临时分辨率的消融过程。视场为250μm×250μm。将具有4 ps脉冲持续时间和800 nm波长的超短激光脉冲聚焦到工件上。由所得图像计算出冲击波的能量含量。冲击波的能量含量约为入射能量的20％，并且冲击波的传播速度超过2000 m / s。在10〜（13）W / cm〜2范围内的高强度导致形成等离子羽流，这在阴影摄影图像中清晰可见。

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