Introducing a new optimization tool for femtosecond laser-induced surface texturing on titanium, stainless steel, aluminum and copper

Ahmmed, K. M. Tanvir; Ling, Edwin Jee Yang; Servio, Phillip; Kietzig, Anne‐Marie

doi:10.1016/j.optlaseng.2014.09.017

Cited by 110 publications

(81 citation statements)

References 58 publications

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“…Within our previous work we have observed a maze-like structure on Al at a fluence lower than the regular columnar structure formation fluence [48]. Such maze-like structures are shown in Figure 9c.…”

Section: Formation Of Lipss and Nanowhiskers On Top Of Columnar Strucsupporting

confidence: 62%

“…The size of the holes varied from a few micrometers to a few hundred nanometers. More regular hole patterns were observed on Ti, SS304, and SS316 at a fluence higher than the fluence level needed for columnar structure formation [48,81,84,114]. Regular hole structures on Ti are shown in Figure 9a.…”

Section: Formation Of Lipss and Nanowhiskers On Top Of Columnar Strucmentioning

confidence: 94%

“…The effect of overscanning on SS316 was investigated and it was found that the aspect ratio of columnar structures increased with an increasing number of overscans [120]. The effects of overscanning were also studied on Ti and SS304 [48]. It was observed that the microstructure size increased with an increasing number of scans (Figure 6b,c).…”

Section: Formation Of Lipss and Nanowhiskers On Top Of Columnar Strucmentioning

confidence: 96%

“…For metals with a large electron-phonon (e-ph) coupling constant energy is transferred faster from the electrons to the lattice than for metals with low e-ph coupling constants, and thus no significant amount of heat transfers to the inside of the material for metals with large e-ph coupling constants. As a result, the absorbed energy accumulates near the surface of the material, and leads to laser-induced surface structures due to increased hydrodynamics of the molten material [48]. Thus, transient materials with their large e-ph coupling constant are more prone to forming various surface structures compared to noble materials that have low e-ph coupling constants.…”

Section: Laser-matter Interactionmentioning

confidence: 99%

“…All these parameters ultimately affect the total amount of laser energy reaching the surface, as well as the spatial and temporal profile of this energy. We have previously proposed two different models for structure optimization: Accumulated Fluence Profile (AFP) and Fluence-Pulse Per Spot (F-PPS) [48]. These two models include the pulse energy, repetition rate of the laser beam, beam diameter, scanning velocity, and overlap, which are expressed by two new parameters that enable direct structure optimization.…”

Section: Structure Optimizationmentioning

confidence: 99%

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Fabrication of Micro/Nano Structures on Metals by Femtosecond Laser Micromachining

2014

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Abstract:Femtosecond laser micromachining has emerged in recent years as a new technique for micro/nano structure fabrication because of its applicability to virtually all kinds of materials in an easy one-step process that is scalable. In the past, much research on femtosecond laser micromachining was carried out to understand the complex ablation mechanism, whereas recent works are mostly concerned with the fabrication of surface structures because of their numerous possible applications. The state-of-the-art knowledge on the fabrication of these structures on metals with direct femtosecond laser micromachining is reviewed in this article. The effect of various parameters, such as fluence, number of pulses, laser beam polarization, wavelength, incident angle, scan velocity, number of scans, and environment, on the formation of different structures is discussed in detail wherever possible. Furthermore, a guideline for surface structures optimization is provided. The authors' experimental work on laser-inscribed regular pattern fabrication is presented to give a complete picture of micromachining processes. Finally, possible applications of laser-machined surface structures in different fields are briefly reviewed.

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Section: Formation Of Lipss and Nanowhiskers On Top Of Columnar Strucsupporting

confidence: 62%

Section: Formation Of Lipss and Nanowhiskers On Top Of Columnar Strucmentioning

confidence: 94%

Section: Formation Of Lipss and Nanowhiskers On Top Of Columnar Strucmentioning

confidence: 96%

Section: Laser-matter Interactionmentioning

confidence: 99%

Section: Structure Optimizationmentioning

confidence: 99%

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Fabrication of Micro/Nano Structures on Metals by Femtosecond Laser Micromachining

2014

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One‐Step Fabrication of Pillar and Crater‐Like Structures on Titanium Using Direct Laser Interference Patterning

et al. 2018

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Direct laser interference patterning (DLIP) is used to create periodic crater‐ and pillar‐like patterns on titanium surfaces. A Nd:YAG laser operating at 532 nm wavelength with a pulse duration of 8 ns and the ability to control the polarization of each individual beam is used for the laser patterning process. The generated periodic patterns with spatial periods of 5 and 10 μm are produced with energy densities between 0.3 and 5.1 J cm−2 with a single laser pulse. By varying the polarization of each interfering beam and the energy density, various forms of the occurring topography are observed due to the different shape of the interference intensity pattern and the solidification front of the molten material at the maxima positions. The characterization of the surface chemistry shows that the laser treatment increases the relative content of alumina in the reactive layer from 36% to 51%. The structural analysis of pillar‐like patterned surface shows no changes in microstructure after the laser treatment. Contact angles of 47° ± 7° down to 6° ± 4° are measured on both, crater‐ and pillar‐like surfaces which are significantly lower compared to the untreated reference (79° ± 2°).

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Self‐Organized Periodic Microholes Array Formation on Aluminum Surface via Femtosecond Laser Ablation Induced Incubation Effect

Liu

Lin

Zhao

et al. 2019

Adv Funct Materials

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Laser surface structuring has been demonstrated to be a versatile technology to create various functional materials by modifying solid surface properties. An interesting experimental phenomenon of self-organized periodic microholes array formation is demonstrated by exposing an aluminum surface to femtosecond laser irradiation. The microholes with a diameter much smaller than focal laser spot size are produced along laser scan paths due to the incubation effect of multiple laser scans, and they spontaneously form a highly ordered microholes array after 80 scans. It is found that the microhole period and diameter are highly dependent on laser fluence, and controllable microholes arrays with different periods and diameters are achieved by adjusting laser fluence. The physical mechanism behind the formation of the microholes array is attributed to femtosecond laser-induced melting and Marangoni effect. The research provides a novel processing approach to achieve controllable microholes surface materials fabrication at a high speed on metal substrates, which are of great interests for various technological applications.

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Introducing a new optimization tool for femtosecond laser-induced surface texturing on titanium, stainless steel, aluminum and copper

Cited by 110 publications

References 58 publications

Fabrication of Micro/Nano Structures on Metals by Femtosecond Laser Micromachining

Fabrication of Micro/Nano Structures on Metals by Femtosecond Laser Micromachining

One‐Step Fabrication of Pillar and Crater‐Like Structures on Titanium Using Direct Laser Interference Patterning

Self‐Organized Periodic Microholes Array Formation on Aluminum Surface via Femtosecond Laser Ablation Induced Incubation Effect

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