Efficient picosecond laser ablation of copper cylinders

Gaidys, Mantas; Žemaitis, Andrius; Gečys, Paulius; Gedvilas, Mindaugas

doi:10.1016/j.apsusc.2019.04.002

Cited by 22 publications

(12 citation statements)

References 43 publications

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“…The maximum ablation efficiency of 4.8 µm 3 /µJ and ablation rate of 0.18 mm 3 /s (10.5 mm 3 /min) was obtained, with the average optical power of 36 W, 3 pulses per burst and 10 ps pulse duration. In our best knowledge, the highest reported value of laser milling ablation efficiency for copper by ultrashort pulse laser emitting at ~1 µm optical wavelength, did not exceed <3 µm 3 /µJ 8,10,15,16 . The quality of processed surface at the optimal processing parameters for the highest ablation efficiency was evaluated by measuring the surface roughness R a , and it was 0.4 µm.…”

Section: Introductionmentioning

confidence: 72%

Highly-efficient laser ablation of copper by bursts of ultrashort tuneable (fs-ps) pulses

Žemaitis

Gečys

Barkauskas³

et al. 2019

Sci Rep

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Ultrashort pulse laser, capable of varying pulse duration between 210 fs and 10 ps and producing a burst of pulses with an intra-burst pulse repetition rate of 64.5 MHz (time distance between pulses 15.5 ns), was used to investigate the ablation efficiency of the copper. The study on ablation efficiency was done for various numbers of pulses per burst between 1 and 40. The increase in the ablation efficiency by 20% for 3 pulses per burst compared to a non-burst regime was observed. The comparison was made between the beam-size optimised regimes. Therefore, the real advantage of the burst regime was demonstrated. To the best of our knowledge, we report the highest laser milling ablation efficiency of copper of 4.84 µm 3 /µJ by ultrashort pulses at ~1 µm optical wavelength.

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Section: Introductionmentioning

confidence: 72%

Highly-efficient laser ablation of copper by bursts of ultrashort tuneable (fs-ps) pulses

Žemaitis

Gečys

Barkauskas³

et al. 2019

Sci Rep

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“…Here, the optimal fluence depends solely on the threshold fluence F th and inherently the focal beam radius w 0 . Keeping the pocket-size and laser strategy unchanged leads to the same processing time for all experiments [49,50]. The attained multi-pulse threshold of ablation from fitting and extrapolation to equation 1for sub-picosecond pulsed ablation reveals 0.13 J cm −2 for ATZ, 0.18 J cm −2 for alumina, and 0.21 J cm −2 in case of TZP.…”

Section: Laser Ablation Characteristics Of Atz and Tzpmentioning

confidence: 90%

Rationally designed ultra-short pulsed laser patterning of zirconia-based ceramics tailored for the bone-implant interface

Ackerl¹,

Bork²,

Hauert³

et al. 2020

Preprint

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Ceramic composite materials are increasingly used in dental restoration procedures, but current ceramic surface designs do not yet achieve the osseointegration potential of state-of-the-art titanium implants. Rapid bone tissue integration of an implant is greatly dependent on its surface characteristics, but the material properties of ceramic composite materials interfere with classical surface modification techniques. Here, ultra-short pulsed laser machining, which offers a defined energy input mitigating a heat-affected zone, is explored for surface modification of ceramic composites. Inspired by surface textures of clinically relevant titanium implants, dual roughness surfaces are laser patterned. Raman mapping reveals a negligible effect of ultra-short pulsed laser ablation on material properties, but a laser-induced change in the wetting state is revealed by static contact angle measurements. Laser patterning of surfaces also influences blood coagulation, but not the attachment and spreading of osteoblastic cells. The presented laser machining approach thus allows the introduction of a rational surface design on ceramic composites, holding great promise for the manufacturing of ceramic implants.

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“…Similar structures were found at pulsed laser deposition (PLD) of copper using picosecond laser irradiation in air. The PLD induced copper particles presented a high tendency to agglomerate and form chainlike structures [13].…”

Section: Two-dimensional Laser Irradiationmentioning

confidence: 99%

“…Laser ablation processes inducing copper surface modification were reported for pulsed irradiation with different pulse duration and laser wavelength [1, 3, 5, 15, 18, 20-22, 26, 28, 29, 31, 33, 41, 42, 44]. Laser ablation was studied for ns- [3,14,18,23,33,37], ps- [5,13,15,20,22,23,29,41,42,44] and fs-laser irradiation [15,20,26,28,29,41,42,44] with wavelengths from ultraviolet to infrared. The ablation was furthermore investigated as a function of several other laser parameters such as the wavelength λ [33], the pulse duration ∆t p [15,29,41], the number of laser pulses N [5], the laser pulse energy E [33], the repetition rate f [20,28], as well as multi-pulse irradiation (burst) [4,44].…”

Section: Introductionmentioning

confidence: 99%

Secondary electron yield reduction of copper after 355 nm ultrashort pulse laser ablation

Lorenz

Himmerlich

Ehrhardt

et al. 2022

Lasers Manuf. Mater. Process.

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Nanostructured surfaces exhibit remarkable chemical, physical and microbiological properties and have therefore various technical and industrial applications. The ultrashort laser pulse irradiation (wavelength λ = 355 nm, pulse duration Δtp = 12 ps, repetition rate f = 100 kHz) of copper samples with appropriate laser parameters results in the formation of a micro- and nanostructured surfaces. The influence of these hierarchically textured surfaces on the secondary electron yield (SEY) was studied especially with regard to their morphological and geometrical properties. Specific SEY changes are caused by both, the shape and the depth of the microstructures, as well as the morphology of the formed nanostructures; that can be either compact flower head-like nanostructures, non-compact filament-shaped nanostructures, molten and resolidified spherical structures, or minor modified surfaces. The measured SEY as a function of the primary electron energy is correlated with the surface topography that forms upon laser irradiation. The SEY decreases with increasing accumulated laser fluence and ablated volume, respectively. Especially flower-head-like nanostructures can be produced at high laser power (P ≥ 400 mW) and low scanning velocity (v ≤ 10 mm/s) and represent a surface with strongly reduced SEY maximum as low as 0.7.

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Efficient picosecond laser ablation of copper cylinders

Cited by 22 publications

References 43 publications

Highly-efficient laser ablation of copper by bursts of ultrashort tuneable (fs-ps) pulses

Highly-efficient laser ablation of copper by bursts of ultrashort tuneable (fs-ps) pulses

Rationally designed ultra-short pulsed laser patterning of zirconia-based ceramics tailored for the bone-implant interface

Secondary electron yield reduction of copper after 355 nm ultrashort pulse laser ablation

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