论文标题
电离过程和激光诱导的介电过程中的周期性表面结构，具有中型飞秒激光脉冲
Ionisation processes and laser induced periodic surface structures in dielectrics with mid-infrared femtosecond laser pulses
论文作者
论文摘要
在中红外（MID-IR）光谱区域中具有超短脉冲和激光加工的固体的辐射是一个尚未开发的磁场，具有广泛应用的潜力很大。在这项工作中，详细研究了与融合二氧化硅（SIO2）用超短激光脉冲在IR区域辐射后与过程相关的激光驱动的物理现象。进行了多尺度建模方法，该方法将垂直线形成或平行于低强度和高强度MID-IR脉冲（以前在这些波长的介电中未探索）的条件相关。结果表明，隧道效应在光电子化速率中显着支配，并且对长激光波长的影响电离对电离产生了强大的影响。这项工作中介绍的方法旨在阐明以前未开发的光谱区域中的基本机制，并允许系统的新型表面工程具有强大的MID-IR领域，用于高级工业激光应用。
Irradiation of solids with ultrashort pulses and laser processing in the mid-Infrared (mid-IR) spectral region is a yet predominantly unexplored field with a large potential for a wide range of applications. In this work, laser driven physical phenomena associated with processes following irradiation of fused silica (SiO2) with ultrashort laser pulses in the mid-IR region are investigated in detail. A multiscale modelling approach is performed that correlates conditions for formation of perpendicular or parallel to the laser polarisation low spatial frequency periodic surface structures for low and high intensity mid-IR pulses (not previously explored in dielectrics at those wavelengths), respectively. Results demonstrate a remarkable domination of tunneling effects in the photoionisation rate and a strong influence of impact ionisation for long laser wavelengths. The methodology presented in this work is aimed to shed light on the fundamental mechanisms in a previously unexplored spectral area and allow a systematic novel surface engineering with strong mid-IR fields for advanced industrial laser applications.
