Interaction of bursts of ultrafast laser radiation in the GHz to MHz regime with metals - MULTIPULSE

GHz 至 MHz 范围内的超快激光辐射爆发与金属的相互作用 - 多重脉冲

• 批准号: 458053570
• 金额: --
• 依托单位: Laserinstitut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/458053570?language=en
• 关键词: Interaction; bursts; ultrafast; laser; radiation

The interaction of metals with bursts of ultrafast laser radiation with repetition rates in the gigahertz to megahertz range is investigated to quantitatively explain the change of the topology of the ablation structure and the resulting fluctuating ablation volume per pulse as a function of the number of pulses and their temporal distance. Additionally, the understanding of the interaction of the ultrafast laser radiation with the material enables the determination of optimal parameters for the efficient generation of high-quality structures using bursts of ultrafast laser radiation in follow-up projects. Therefore, all occurring effects, such as the altered material surface due to heat accumulation, incubation and re-deposition of material from the ablation cloud on the material surface as well as the interaction (reflection, transmission, and absorption) of the laser radiation of a subsequent pulse with an existing plasma or ablations cloud are complementarily investigated by an ex-situ analysis of the ablation structure, an in-situ determination of the optical response of the material, and the modeling of the interaction of the laser radiation with the material. The planned project is therefore divided into three work packages, AP1 preparation, AP2 double pulse, and AP3 multi-pulse, each with increasing complexity and progressive knowledge. The investigations include a variation of the process and material parameters (material: gold and iron deposited as layers with different layer thicknesses on a glass substrate; parameters of the laser radiation: fluence, pulse duration, number of pulses, temporal pulse distance), the use of time- and space-resolved metrology (pump-probe reflectometry, - ellipsometry and - shadow photography), and the modeling of the interaction of the laser radiation with the material (two-temperature-model in combination with hydrodynamics TTMHD, phase diagrams, propagation of the laser radiation through the ablation cloud). Thereby, the relationships and dependencies between the parameters of the applied bursts of ultrafast laser radiation with the generated ablation structures are determined.

研究了金属与重复率在千兆赫至兆赫范围内的超快激光辐射爆发的相互作用，以定量解释烧蚀结构的拓扑变化以及每个脉冲产生的波动烧蚀体积作为脉冲数量及其时间距离的函数。此外，了解超快激光辐射与材料的相互作用可以确定最佳参数，以便在后续项目中使用超快激光辐射爆发有效生成高质量结构。因此，所有发生的效应，例如由于材料表面上的烧蚀云的材料的热积累、孵化和再沉积而改变的材料表面，以及后续脉冲的激光辐射与现有等离子体或烧蚀云的相互作用（反射、透射和吸收），都可以通过烧蚀结构的异位分析、材料光学响应的​​原位测定来补充研究， 以及激光辐射与材料相互作用的建模。因此，计划的项目分为三个工作包，AP1准备、AP2双脉冲和AP3多脉冲，每个工作包的复杂性和知识不断进步。研究包括工艺和材料参数的变化（材料：在玻璃基板上以不同层厚度沉积的金和铁；激光辐射参数：能量密度、脉冲持续时间、脉冲数量、时间脉冲距离）、时间和空间分辨计量学的使用（泵浦探针反射测量、椭圆光度测量和阴影摄影）以及激光相互作用的建模 材料辐射（双温度模型与流体动力学 TTMHD、相图、激光辐射通过烧蚀云的传播相结合）。由此，确定所施加的超快激光辐射脉冲的参数与所生成的烧蚀结构之间的关系和依赖性。