Laser-induced periodic surface structures on fused silica upon cross-polarized two-color double-fs-pulse irradiation
Laser-induced periodic surface structures on fused silica upon cross-polarized two-color double-fs-pulse irradiation
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DOI：
10.1016/j.apsusc.2014.09.101
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发表时间：
2015-05-01
影响因子：
6.7
通讯作者：
Bonse, J.
中科院分区：
文献类型：
--
作者：
Hoehm, S.;Herzlieb, M.;Bonse, J.
通过交叉偏振双色双飞秒脉冲实验，研究了线偏振飞秒激光脉冲(脉冲宽度为50飞秒)照射下熔融石英表面激光诱导周期性表面结构(LIPSS)的形成动力学。为了分析LIPSS形成早期时间分布能量沉积的相关性，利用Mach-Zehnder干涉仪产生了两个不同波长(400和800 nm)的多个双脉冲序列。每个序列的单个交叉极化脉冲之间的脉冲间延迟在亚ps范围内系统地变化，并用扫描电子显微镜对LIPSS的形貌进行了表征。研究发现，到达表面的第一个激光脉冲的偏振决定了LIPSS的取向和周期。这些双色实验进一步证实了超快能量沉积对形成LIPSS的二氧化硅表面的重要性，特别是通过每个序列的第一个激光脉冲。第二个激光脉冲随后加强了先前播种的空间LIPSS特性(周期、方向)。(C)2014爱思唯尔B.V.保留所有权利。
The dynamics of the formation of laser-induced periodic surface structures (LIPSS) on fused silica upon irradiation with linearly polarized fs-laser pulses (50 fs pulse duration) is studied by cross-polarized two-color double-fs-pulse experiments. In order to analyze the relevance of temporally distributed energy deposition in the early stage of LIPSS formation, a Mach-Zehnder interferometer was used for generating multiple double-pulse sequences at two different wavelengths (400 and 800 nm). The inter-pulse delay between the individual cross-polarized pulses of each sequence was systematically varied in the sub-ps range and the resulting LIPSS morphologies were characterized by scanning electron microscopy. It is found that the polarization of the first laser pulse arriving to the surface determines the orientation and the periodicity of the LIPSS. These two-color experiments further confirm the importance of the ultrafast energy deposition to the silica surface for LIPSS formation, particularly by the first laser pulse of each sequence. The second laser pulse subsequently reinforces the previously seeded spatial LIPSS characteristics (period, orientation). (C) 2014 Elsevier B.V. All rights reserved.