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

机译：飞秒激光照射后，通过新型泵浦探针摄影装置观察金属中熔体喷射的时间长达1μs

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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 t_p = 80 fs, at wavelength of 820 nm. This technique enables direct visualization of laser-induced processes up to 1 μs 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 μs after the initial laser-metal interaction.
机译：与较长的脉冲相比，用超短的激光脉冲照射金属揭示了多种通用的微观过程。尤其是，某些特定材料特性（例如电子-声子耦合）的影响似乎越来越重要，以满足加工要求。因此，在亚皮秒激光辐射的材料加工中，寻找最佳工艺参数区域已成为主要问题。已经通过高分辨率泵浦探针照相法对大块金属（Al，Cu）的烧蚀进行了现场研究，该技术使用了脉冲持续时间t_p = 80 fs的泵浦激光辐射，波长为820 nm。在单个激光脉冲与材料相互作用之后，该技术可以直接观察长达1μs的激光诱导过程。激光辐射通量的变化，熔融和后熔融过程的行为和时间特性的变化已经成为研究的问题。取决于金属的特定参数，已经观察到质量上不同的烧蚀现象。通过电子和光学显微术进行的结构分析揭示了玫瑰花状的表面结构，显示出烧蚀区域的形态。消融动力学的时间发展可以有条件地分为不同的特征时间区域。特别地，在初始激光与金属相互作用之后的700 ns至1.0μs的时间范围内观察到了激光诱导的熔体注入。

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