scholarly journals Effect of Laser Pulse Overlap and Scanning Line Overlap on Femtosecond Laser-Structured Ti6Al4V Surfaces

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 969 ◽  
Author(s):  
Georg Schnell ◽  
Ulrike Duenow ◽  
Hermann Seitz
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Surface Topography ◽  
Cell Attachment ◽  
Surface Structures ◽  
Laser Source ◽  
Laser Machining ◽  
Scanning Strategy ◽  
Wide Range ◽  
Scanning Line

Surface structuring is a key factor for the tailoring of proper cell attachment and the improvement of the bone-implant interface anchorage. Femtosecond laser machining is especially suited to the structuring of implants due to the possibility of creating surfaces with a wide variety of nano- and microstructures. To achieve a desired surface topography, different laser structuring parameters can be adjusted. The scanning strategy, or rather the laser pulse overlap and scanning line overlap, affect the surface topography in an essential way, which is demonstrated in this study. Ti6Al4V samples were structured using a 300 fs laser source with a wavelength of 1030 nm. Laser pulse overlap and scanning line overlap were varied between 40% and 90% over a wide range of fluences (F from 0.49 to 12.28 J/cm²), respectively. Four different main types of surface structures were obtained depending on the applied laser parameters: femtosecond laser-induced periodic surface structures (FLIPSS), micrometric ripples (MR), micro-craters, and pillared microstructures. It could also be demonstrated that the exceedance of the strong ablation threshold of Ti6Al4V strongly depends on the scanning strategy. The formation of microstructures can be achieved at lower levels of laser pulse overlap compared to the corresponding value of scanning line overlap due to higher heat accumulation in the irradiated area during laser machining.

In vitro study on the response of RAW264.7 and MS-5 fibroblast cells on laser-induced periodic surface structures for stainless steel alloys

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42548-42558 ◽  
Author(s):  
Clare McDaniel ◽  
Olga Gladkovskaya ◽  
Aiden Flanagan ◽  
Yury Rochev ◽  
Gerard M. O'Connor
Keyword(s):  
Stainless Steel ◽  
Surface Topography ◽  
Cell Attachment ◽  
In Vitro Study ◽  
Surface Structures ◽  
Fibroblast Cells ◽  
Steel Alloys ◽  
Periodic Surface ◽  
Stent Surface

Cell attachment and growth can be controlled by stent surface topography. In some cases fibroblast cells attach while monocytes failed on the structured surface of Pt:SS and 316LSS stents.

Periodic surface structures on Ni–Fe film induced by a single femtosecond laser pulse with diffraction rings

2017 ◽  
Vol 15 (2) ◽  
pp. 022201-22205 ◽  
Author(s):  
Kan Zhou Kan Zhou ◽  
Xin Jia Xin Jia ◽  
Huixia Xi Huixia Xi ◽  
Jukun Liu Jukun Liu ◽  
Donghai Feng Donghai Feng ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Surface Structures ◽  
Periodic Surface

scholarly journals Laser-induced ablation of tantalum in a wide range of pulse durations

2020 ◽  
Vol 126 (9) ◽  
Author(s):  
Steffen Mittelmann ◽  
Jannis Oelmann ◽  
Sebastijan Brezinsek ◽  
Ding Wu ◽  
Hongbin Ding ◽  
...  
Keyword(s):  
Confocal Microscopy ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Pulse Duration ◽  
Laser Fluence ◽  
Crater Depth ◽  
Nanosecond Laser ◽  
Threshold Fluence ◽  
Wide Range ◽  
Laser Systems

Abstract We present data and analysis of the laser-induced ablation of pure tantalum (Ta, $$Z=73$$ Z = 73 ). We have identified different physical regimes using a wide range of laser pulse durations. A comparison of the influence of strongly varying laser pulse parameters on high-Z materials is presented. The crater depth caused by three different laser systems of pulse duration $${\varDelta }\tau _1=5\,\mathrm {ns}$$ Δ τ 1 = 5 ns and wavelength $$\lambda _1=1064\,\mathrm {nm}$$ λ 1 = 1064 nm , $${\varDelta }\tau _2=35\,\mathrm {ps}$$ Δ τ 2 = 35 ps , $$\lambda _2=355\,\mathrm {nm}$$ λ 2 = 355 nm and $${\varDelta }\tau _3=8.5\,\mathrm {fs}$$ Δ τ 3 = 8.5 fs , $$\lambda _3=790\,\mathrm {nm}$$ λ 3 = 790 nm are analyzed via confocal microscopy as a function of laser fluence and intensity. The minimum laser fluence needed for ablation, called threshold fluence, decreases with shorter pulse duration from $$1.10\,\mathrm {J/cm}^2$$ 1.10 J / cm 2 for the nanosecond laser to $$0.17\,\mathrm {J/cm}^2$$ 0.17 J / cm 2 for the femtosecond laser.

scholarly journals T-junction droplet generator realised in lithium niobate crystals by laser ablation

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
G. Pozza ◽  
S. Kroesen ◽  
G. Bettella ◽  
A. Zaltron ◽  
M. Esseling ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Lithium Niobate ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Droplet Generator ◽  
Wide Range ◽  
Junction Geometry ◽  
Fluidic Circuits ◽  
Pulse Energies ◽  
Lithium Niobate Crystals

AbstractA femtosecond laser at 800 nm was used to create micro-fluidic circuits on lithium niobate (LiNbO3) substrates by means of laser ablation, using different scanning velocities (100-500 μm/s) and laser pulse energies (1-20 μJ). The T-junction geometry was exploited to create on y-cut LiNbO3 crystals a droplet generator, whose microfluidic performance was characterized in a wide range of droplet generation frequencies, from few Hz to about 1 kHz.

Generation and erasure of femtosecond laser-induced periodic surface structures on nanoparticle-covered silicon by a single laser pulse

2014 ◽  
Vol 39 (2) ◽  
pp. 343 ◽  
Author(s):  
Ming Yang ◽  
Qiang Wu ◽  
Zhandong Chen ◽  
Bin Zhang ◽  
Baiquan Tang ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Surface Structures ◽  
Single Laser Pulse ◽  
Periodic Surface ◽  
Single Laser

scholarly journals Anisotropy modulations of femtosecond laser pulse induced periodic surface structures on silicon by adjusting double pulse delay

2014 ◽  
Vol 22 (13) ◽  
pp. 15820 ◽  
Author(s):  
Weina Han ◽  
Lan Jiang ◽  
Xiaowei Li ◽  
Qingsong Wang ◽  
Hao Li ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Double Pulse ◽  
Surface Structures ◽  
Pulse Delay ◽  
Periodic Surface
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