scholarly journals Comprehensive ablation study of near-IR femtosecond laser action on the titanium-based alloy Ti6Al4V: morphological effects and surface structures at low and high fluences

2022 ◽  
Vol 76 (1) ◽  
Author(s):  
Dubravka Milovanović ◽  
Boris Rajčić ◽  
Sanja Petronić ◽  
Aleksandra Radulović ◽  
Bojan Radak ◽  
...  
Keyword(s):  
Laser Action ◽  
Damage Threshold ◽  
Single Pulse ◽  
Surface Structures ◽  
Periodic Surface ◽  
Spot Area ◽  
High Fluences ◽  
Near Ir ◽  
Ablation Study ◽  
Pulse Energies

Abstract The surface of a titanium-based alloy Ti6Al4V was subjected to modifications by a near-IR femtosecond Ti:Sapphire laser, emitting at 775 nm pulses of 200 fs duration, in single-pulse and multi-pulse regimes, with up to 400 accumulated pulses, and pulse energies ranging from 2.5 to 250 $$\upmu $$ μ J. The whole range of induced effects is presented, from gentle ablation and pattern occurrence to substantial crater formation. Very observable laser-induced parallel periodic surface structures are reported, appearing both within the damage spot area, with low fluences, and at the peripheries of the craters, with higher fluences—but also on crater walls, and inside the crater structures. Damage threshold fluences $$({F}_{\mathrm{th}})$$ ( F th ) and the incubation factor $$(\zeta )$$ ( ζ ) were also determined. Graphic abstract

scholarly journals Enhanced Absorptance of 45# Steel by Laser-Induced Periodic Surface Structures (LIPSS)

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1237 ◽  
Author(s):  
Tianyu Wang ◽  
Jintian Bian ◽  
Xin Li ◽  
Hui Kong ◽  
Lei Wang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Near Infrared ◽  
Damage Threshold ◽  
Vital Role ◽  
Surface Structures ◽  
Integrating Sphere ◽  
Infrared Band ◽  
Periodic Surface ◽  
Spot Area ◽  
Linearly Polarized

The absorptance of metals is often low within the visible and near-infrared band at room temperature. Increasing the absorption of metals plays a vital role in reducing energy consumption and production cost. After irradiation by 10 ns linearly polarized pulses with fluence close to the zero-probability damage threshold, the surface of 45# steel samples exhibited four kinds of surface structures in the spot area. The samples’ absorptance is improved by 38% when a high-quality laser-induced surface structure (LIPSS) appears at the spot centre. With the increase of the number of pulses, LIPSS begin to melt down, which will decrease the surface absorptance due to the appearance of damage stripes. The relative absorptance of samples was measured by an integrating sphere system. The paper reports detailed experiments to show that LIPSS can improve samples’ absorptance significantly.

scholarly journals Titanium surface modification using femtosecond laser with 1013–1015 W/cm2 intensity in vacuum

2012 ◽  
Vol 31 (1) ◽  
pp. 29-36 ◽  
Author(s):  
M. Trtica ◽  
D. Batani ◽  
R. Redaelli ◽  
J. Limpouch ◽  
V. Kmetik ◽  
...  
Keyword(s):  
Surface Modification ◽  
Femtosecond Laser ◽  
Titanium Surface ◽  
Femtosecond Lasers ◽  
Single Pulse ◽  
Surface Structures ◽  
Pulse Regime ◽  
Periodic Surface ◽  
Reduced Intensity ◽  
Surface Changes

AbstractThe response of titanium surface irradiated with high intensity (1013 – 1015 W/cm2) Ti:sapphire laser was studied in vacuum. Most of the reported investigations were conducted with nano- to femtosecond lasers in gas atmospheres while the studies of titanium surface interacting with femtosecond laser in vacuum are scarce. The laser employed in our experiment was operating at 800 nm wavelength and pulse duration of 60 fs in single pulse regime. The observed surface changes and phenomena are (1) creation of craters, (2) formation of periodic surface structures at the reduced intensity, and (3) occurrence of plasma in front the target. Since microstructuring of titanium is very interesting in many areas (industry, medicine), it can be concluded from this study that the reported laser intensities can effectively be applied for micromachining of the titanium surface (increasing the roughness, formation of parallel periodic surface structures etc.).

scholarly journals Mechanism of single-pulse ablative generation of laser-induced periodic surface structures

2017 ◽  
Vol 96 (20) ◽  
Author(s):  
Maxim V. Shugaev ◽  
Iaroslav Gnilitskyi ◽  
Nadezhda M. Bulgakova ◽  
Leonid V. Zhigilei
Keyword(s):  
Single Pulse ◽  
Surface Structures ◽  
Periodic Surface

Periodic surface structures induced by femtosecond laser single pulse and pulse trains on metals

Laser Physics ◽  
2015 ◽  
Vol 25 (5) ◽  
pp. 056103 ◽  
Author(s):  
Jun Xie ◽  
Feng Wang ◽  
Lan Jiang ◽  
Liangliang Zhao ◽  
Yongfeng Lu
Keyword(s):  
Femtosecond Laser ◽  
Single Pulse ◽  
Surface Structures ◽  
Periodic Surface ◽  
Pulse Trains

scholarly journals Key role of surface plasmon polaritons in generation of periodic surface structures following single-pulse laser irradiation of a gold step edge

Nanophotonics ◽  
2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Pavel N. Terekhin ◽  
Jens Oltmanns ◽  
Andreas Blumenstein ◽  
Dmitry S. Ivanov ◽  
Frederick Kleinwort ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Surface Plasmon ◽  
Surface Plasmon Polaritons ◽  
Single Pulse ◽  
Step Edge ◽  
Surface Structures ◽  
Femtosecond Laser Irradiation ◽  
Processing Technologies ◽  
Periodic Surface ◽  
Plasmon Polaritons

Abstract Understanding the mechanisms and controlling the possibilities of surface nanostructuring is of crucial interest for both fundamental science and application perspectives. Here, we report a direct experimental observation of laser-induced periodic surface structures (LIPSS) formed near a predesigned gold step edge following single-pulse femtosecond laser irradiation. Simulation results based on a hybrid atomistic-continuum model fully support the experimental observations. We experimentally detect nanosized surface features with a periodicity of ∼300 nm and heights of a few tens of nanometers. We identify two key components of single-pulse LIPSS formation: excitation of surface plasmon polaritons and material reorganization. Our results lay a solid foundation toward simple and efficient usage of light for innovative material processing technologies.

Mechanically metastable structures generated by single pulse laser-induced periodic surface structures (LIPSS) in the photoresist SU8

2018 ◽  
Vol 29 (30) ◽  
pp. 305303 ◽  
Author(s):  
Hendrik Reinhardt ◽  
Patrick Peschke ◽  
René Riedel ◽  
Norbert Hampp
Keyword(s):  
Pulse Laser ◽  
Single Pulse ◽  
Surface Structures ◽  
Periodic Surface ◽  
Metastable Structures

Effect of a liquid environment on single-pulse generation of laser induced periodic surface structures and nanoparticles

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7674-7687 ◽  
Author(s):  
Cheng-Yu Shih ◽  
Iaroslav Gnilitskyi ◽  
Maxim V. Shugaev ◽  
Evangelos Skoulas ◽  
Emmanuel Stratakis ◽  
...  
Keyword(s):  
Experimental Study ◽  
Single Pulse ◽  
Pulse Generation ◽  
Surface Structures ◽  
Liquid Environment ◽  
Periodic Surface ◽  
Surface Nanostructuring

Mechanisms of laser-assisted surface nanostructuring and generation of nanoparticles are revealed in a closely integrated computational and experimental study.

scholarly journals Three-Step Description of Single-Pulse Formation of Laser-Induced Periodic Surface Structures on Metals

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1836 ◽  
Author(s):  
Evgeny L. Gurevich ◽  
Yoann Levy ◽  
Nadezhda M. Bulgakova
Keyword(s):  
Femtosecond Laser ◽  
Single Pulse ◽  
Surface Structures ◽  
Numerical Calculations ◽  
Self Organization ◽  
Hydrodynamic Instabilities ◽  
Electronic Temperature ◽  
Periodic Surface ◽  
Step Model ◽  
Pulse Formation

Two different scenarios are usually invoked in the formation of femtosecond Laser-Induced Periodic Surface Structures (LIPSS), either “self-organization” mechanisms or a purely “plasmonic” approach. In this paper, a three-step model of formation of single-laser-shot LIPSS is summarized. It is based on the periodic perturbation of the electronic temperature followed by an amplification, for given spatial periods, of the modulation in the lattice temperature and a final possible relocation by hydrodynamic instabilities. An analytical theory of the evolution of the temperature inhomogeneities is reported and supported by numerical calculations on the examples of three different metals: Al, Au, and Mo. The criteria of the possibility of hydrodynamic instabilities are also discussed.

Formation of laser-induced periodic surface structures on different materials: fundamentals, properties and applications

2020 ◽  
Vol 9 (1-2) ◽  
pp. 11-39 ◽  
Author(s):  
Stephan Gräf
Keyword(s):  
Friction And Wear ◽  
Review Paper ◽  
Laser Wavelength ◽  
Single Step ◽  
Surface Structures ◽  
Direct Writing ◽  
Periodic Surface ◽  
Experimental Approaches ◽  
Ordered Nanostructures ◽  
Physical Background

AbstractThe use of ultra-short pulsed lasers enables the fabrication of laser-induced periodic surface structures (LIPSS) on various materials following a single-step, direct-writing technique. These specific, well-ordered nanostructures with periodicities in the order of the utilised laser wavelength facilitate the engineering of surfaces with functional properties. This review paper discusses the physical background of LIPSS formation on substrates with different material properties. Using the examples of structural colours, specific wetting states and the reduction of friction and wear, this work presents experimental approaches that allow to deliberately influence the LIPSS formation process and thus tailor the surface properties. Finally, the review concludes with some future developments and perspectives related to forthcoming applications of LIPSS-based surfaces are discussed.

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