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首页> 外文会议>Conference on High-Power Laser Ablation >Observation of melt ejection in metals up to 1 jus after femtosecond laser irradiation by a novel pump-probe photography setup
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Observation of melt ejection in metals up to 1 jus after femtosecond laser irradiation by a novel pump-probe photography setup

机译：小型泵探测摄影设置散发出近1 jus的金属中熔体喷射的观察

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摘要

Irradiation of metals with ultrashort laser pulses reveals a variety of versatile microscopic processes compared to longer pulses. In particular, the impact of some material-specific characteristics, such as the electron-phonon coupling, seems to get more significance in order to meet the machining requirements. Finding the optimal process parameter area has been therefore a dominating problem in materials processing with sub-picosecond laser radiation.Ablation of bulk metals (Al, Cu) has been investigated in-situ by means of high-resolution pump-probe photography using pump laser radiation of pulse duration tp=80 fs, at wavelength of 820 nm. This technique enables direct visualization of laser-induced processes up to 1 u-s after the interaction of a single laser pulse with material. Variation of the fluence of the laser radiation, behavior and time characteristics of melting and post-melting processes have been matter of research.Depending on metal-specific parameters, qualitatively different ablation phenomena have been observed. Structural analysis by electron and optical microscopies reveals rosette-like surface structures showing the morphology of the ablated regions. The temporal development of the ablation dynamics can be conditionally categorized into different characteristic time regions. Particularly, laser induced melt injection has been observed in the time range of 700 ns to 1.0 |is after the initial laser-metal interaction.
机译：与较长脉冲相比，用超短激光脉冲照射金属的辐射显示出各种多功能的微观过程。特别地，一些材料特性的影响，例如电子 - 声子耦合，似乎可以获得更大的意义，以满足加工要求。因此，找到最佳过程参数区域是通过使用泵激光的高分辨率泵探针摄影来研究了使用亚皮秒的激光辐射的材料处理中的主导问题。脉冲持续时间TP = 80 fs的辐射，波长为820nm。在单个激光脉冲与材料的相互作用之后，该技术能够直接可视化激光引起的电源最多1 U-S。熔融和熔化后工艺的激光辐射，行为和时间特征的流量的变化是研究的。在特定于金属的参数上，已经观察到定性不同的消融现象。电子和光学显微镜的结构分析揭示了玫瑰花状表面结构，示出了烧蚀区域的形态。可以将消融动态的时间开发有条件地分类为不同的特征时间区域。特别地，在初始激光 - 金属相互作用之后，在700ns至1.0的时间范围内观察到激光诱导的熔体注射。

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