利用 GHz 脉冲串模式飞秒激光脉冲在钛上形成二维激光诱导周期性表面结构

IF 4.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Frontiers in Nanotechnology Pub Date : 2023-11-20 DOI:10.3389/fnano.2023.1267284
Shota Kawabata, Shi Bai, K. Obata, Kazunari Ozasa, Godai Miyaji, Koji Sugioka
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引用次数: 0

摘要

GHz 脉冲串模式飞秒 (fs) 激光脉冲由一系列间隔为几百皮秒的超快脉冲序列组成,与传统的激光脉冲照射(单脉冲模式)相比,它在材料加工方面具有明显的特点。我们采用 GHz 脉冲串模式加工,在材料表面制造激光诱导周期性表面结构 (LIPSS)。在之前针对硅(Si)的研究中,我们发现 GHz 脉冲串模式可以制造出独特的由平行和垂直于激光偏振方向组成的二维(2D)LIPSS。我们提出,二维 LIPSS 的形成归因于电磁和流体力学机制的协同贡献。为了进一步研究更详细的形成机制并探索实际应用,我们采用了特性与硅有显著差异的钛(Ti)。我们证明了 GHz 脉冲串模式 fs 激光脉冲(中心波长:1,030 nm,脉冲内宽度:230 fs,脉冲内重复率(脉冲内间隔):4.88 GHz (205 fs))可以在钛金属上产生高能量:4.88 GHz (205 ps) 和脉冲串重复率:10 kHz)也能在钛表面制造出二维-LIPSS。我们将 2D-LIPSS 的主要形成机制归结为在 GHz 脉冲猝发辐照期间,由于材料特性的瞬时变化而产生具有高度增强电场的热点。根据这一推测,适当调整猝发脉冲的形状,使其具有最佳的脉冲内数,就能产生定义明确的 2D-LIPSS 。此外,通过聚焦 fs 激光束以 5 mm/s 的平台扫描速度进行激光扫描,可以在大面积内形成基本均匀的 2D-LIPSS 。
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Formation of two-dimensional laser-induced periodic surface structures on titanium by GHz burst mode femtosecond laser pulses
GHz burst mode femtosecond (fs) laser pulses, which consist of a series of pulse trains with ultra-fast intervals of several hundred picoseconds, have offered distinct features for material processing compared to conventional irradiation of laser pulses (single-pulse mode). We apply GHz burst mode processing to fabricate laser-induced periodic surface structures (LIPSS) on the material surfaces. In our previous work for silicon (Si), we have found that GHz burst mode can create unique two-dimensional (2D) LIPSS composed of both parallel and perpendicular to the laser polarization direction. We proposed that the formation of 2D-LIPSS is attributed to the synergetic contributions of electromagnetic and hydrodynamic mechanisms. To further investigate more detailed formation mechanisms and explore practical applications, we employ titanium (Ti), whose properties are significantly different from Si. We demonstrate that GHz burst mode fs laser pulses (central wavelength: 1,030 nm, intra-pulse width: 230 fs, intra-pulse repetition rate (an intra-pulse interval): 4.88 GHz (205 ps) and burst pulse repetition rate: 10 kHz) can also fabricate 2D-LIPSS on Ti surfaces. We attribute the dominant formation mechanism of 2D-LIPSS to the generation of hot spots with highly enhanced electric fields due to transient change of material properties during GHz burst pulse irradiation. Based on this speculation, properly tailoring the shapes of the burst pulse with an optimum intra-pulse number enables the creation of well-defined 2D-LIPSS. Furthermore, essentially homogeneous 2D-LIPSS can be formed in a large area by laser scanning of a focused fs laser beam with a stage scanning speed of 5 mm/s.
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来源期刊
Frontiers in Nanotechnology
Frontiers in Nanotechnology Engineering-Electrical and Electronic Engineering
CiteScore
7.10
自引率
0.00%
发文量
96
审稿时长
13 weeks
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