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首页> 外文期刊>Applied Surface Science >Influence of stress confinement, particle shielding and re-deposition on the ultrashort pulse laser ablation of metals revealed by ultrafast time-resolved experiments
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Influence of stress confinement, particle shielding and re-deposition on the ultrashort pulse laser ablation of metals revealed by ultrafast time-resolved experiments

机译：超快时间分辨实验显示应力限制，粒子屏蔽和再沉积对超短缓的脉冲激光烧蚀的影响

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摘要

The ablation rate in double-pulse material processing is strongly influenced by the pulse separation. For pulse separations exceeding 3 ps a significant decrease in ablation volume has been observed. This was attributed to three mechanisms: rarefaction wave interaction, shielding by ablation plume and material re-deposition. Here we present carefully designed double-pulse ablation experiments on three industrially relevant metals: stainless steel, aluminum and copper and interpret them based on ablation dynamics derived from ultrafast time-resolved pump-probe microscopy and ellipsometry. Adjustment of the fluence distribution within the double-pulse allows us to separate effects arising from rarefaction wave suppression and shielding/re-deposition. We found that the rarefaction wave contribution to the double-pulse ablation volume is about 25% for aluminum and stainless steel and about 40% for copper. A pronounced re-deposition was observed for stainless steel and aluminum, while for copper shielding by the ablation plume plays a dominant role. It was revealed that the ablation volume stays maximal, if the pulse energy is deposited within the mechanical relaxation time of (2 - 5) ps. According to our findings the ablation process exerts maximum efficiency and precision, when energy is coupled into the material before mechanical relaxation or after material surface equilibration.
机译：双脉冲材料处理中的消融率受到脉冲分离的强烈影响。对于超过3 ps的脉冲分离，已经观察到消融体积的显着降低。这归因于三种机制：稀疏波相互作用，通过消融羽流和材料重新沉积屏蔽。在这里，我们在三种工业相关金属上仔细设计了双脉冲消融实验：不锈钢，铝和铜，并根据从超快时间分辨泵探针显微镜和椭圆形测定的消融动态来解释它们。调整双脉冲内的流量分布允许我们分离产生的缺点波抑制和屏蔽/再沉积。我们发现铝和不锈钢的双脉冲消融体积的稀疏波贡献约为25％，铜的约40％约为40％。对于不锈钢和铝，观察到明显的再沉积，而烧结羽流的铜屏蔽起到显着作用。据透露，如果脉冲能量沉积在（2-5）PS的机械松弛时间内，消融体积保持最大。根据我们的研究结果，当能量在机械松弛之前或材料表面平衡后，消融过程施加最大效率和精度。

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  • 来源
    《Applied Surface Science》 |2021年第15期|148930.1-148930.10|共10页
  • 作者

    Spellauge Maximilian; Winter Jan; Rapp Stephan; McDonnell Cormac; Sotier Florian; Schmidt Michael; Huber Heinz P.;

  • 作者单位

    Munich Univ Appl Sci Dept Appl Sci & Mechatron Lothstr 34 D-80335 Munich Germany;

    Munich Univ Appl Sci Dept Appl Sci & Mechatron Lothstr 34 D-80335 Munich Germany|Friedrich Alexander Univ Erlangen Nurnberg Erlangen Grad Sch Adv Opt Technol SAOT Paul Gordon Str 6 D-91052 Erlangen Germany|Friedrich Alexander Univ Erlangen Nurnberg Lehrstuhl Photon Technol Konrad Zuse Str 3-5 D-91052 Erlangen Germany;

    Munich Univ Appl Sci Dept Appl Sci & Mechatron Lothstr 34 D-80335 Munich Germany|Friedrich Alexander Univ Erlangen Nurnberg Erlangen Grad Sch Adv Opt Technol SAOT Paul Gordon Str 6 D-91052 Erlangen Germany|Friedrich Alexander Univ Erlangen Nurnberg Lehrstuhl Photon Technol Konrad Zuse Str 3-5 D-91052 Erlangen Germany;

    Munich Univ Appl Sci Dept Appl Sci & Mechatron Lothstr 34 D-80335 Munich Germany;

    InnoLas Photon GmbH Justus von Liebig Ring 8 D-82152 Krailling Germany;

    Friedrich Alexander Univ Erlangen Nurnberg Lehrstuhl Photon Technol Konrad Zuse Str 3-5 D-91052 Erlangen Germany;

    Munich Univ Appl Sci Dept Appl Sci & Mechatron Lothstr 34 D-80335 Munich Germany;

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  • 正文语种 eng
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  • 关键词

    Laser ablation; Femtosecond laser; Double-pulse laser ablation; Pump-probe microscopy; Pump-probe ellipsometry; GHz processing;

    机译：激光烧蚀;飞秒激光;双脉冲激光烧蚀;泵探针显微镜;泵探针椭圆形测量;GHz处理;

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