From Femtosecond to Nanosecond Laser Microstructuring of Conical Aluminum Surfaces by Reactive Gas Assisted Laser Ablation.,ChemPhysChem

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From Femtosecond to Nanosecond Laser Microstructuring of Conical Aluminum Surfaces by Reactive Gas Assisted Laser Ablation.
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-07-10 , DOI: 10.1002/cphc.202000418
Simon Rauh ₁ , Karl Wöbbeking ₁ , Mingji Li ₁ , Wolfgang Schade _{1,

2} , Eike G Hübner _{1,

3}

Affiliation

A conical microstructure is one of the most versatile surface textures obtained by ultrashort laser micromachining. Besides an increased surface area, unique surface properties such as superhydrophilicity, increased absorptivity; and thermal emissivity can be tailored. On metals, usually ultrashort laser pulses in the femtosecond to low picosecond range are used to obtain these surface structures, whereas nanosecond laser pulses favor melting processes. Herein, we report on an investigation of reactive gas atmospheres such as oxygen, steam, and halogens during laser micromachining of aluminum with 6 ns laser pulses. At a reduced pressure of 20 hPa (air) with additional iodine vapor as reactive species, we found a perfectly microconical structured surface to be formed with nanosecond laser pulses. The resulting surface structures were proven to be free of residual halogens. The application of nanosecond instead of femtosecond laser pulses for the surface structuring process allows to apply significantly less complex laser sources.

中文翻译：

通过反应气体辅助激光烧蚀对圆锥形铝表面进行从飞秒到纳秒激光微结构化。

圆锥形微结构是通过超短激光微加工获得的最通用的表面纹理之一。除了增加表面积外，还具有独特的表面特性，例如超亲水性、增加的吸收率；和热发射率可以定制。对于金属，通常使用飞秒到低皮秒范围内的超短激光脉冲来获得这些表面结构，而纳秒激光脉冲则有利于熔化过程。在此，我们报告了使用 6 ns 激光脉冲对铝进行激光微加工过程中氧气、蒸汽和卤素等反应气体气氛的研究。在 20 hPa（空气）的减压下，使用额外的碘蒸气作为活性物质，我们发现纳秒激光脉冲可以形成完美的微锥形结构表面。所得到的表面结构被证明不含残留卤素。在表面结构化过程中应用纳秒而不是飞秒激光脉冲可以应用明显不太复杂的激光源。

更新日期：2020-07-10

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