scholarly journals Deposition of fibrous nanostructure by ultrafast laser ablation

2021 ◽  
Author(s):  
Amirhossein Tavangar ◽  
Bo Tan ◽  
Krishnan Venkatakrishnan
Keyword(s):  
Laser Ablation ◽  
Research Work ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Vapor Condensation ◽  
Single Step ◽  
Ultrafast Laser ◽  
Ambient Atmosphere ◽  
Pass Through ◽  
Ultrafast Laser Ablation

This research work demonstrated that laser-induced reverse transfer (LIRT) can be used for controllable site-specific deposition of fibrous nanostructure. The LIRT method makes it achievable to generate and deposit fibrous nanostructure of a wide variety of materials on a transparent acceptor in a single-step process at an ambient condition. The deposition of fibrous nanostructure was conducted using ultrafast laser ablation of silicon and aluminum targets placed behind a glass acceptor. Femtosecond laser pulses pass through the transparent acceptor and hit the bulk donor. Consequently a mass quantity of nanoparticles ablates from the donor and then aggregates and forms a porous fibrous nanostructure on the transparent acceptor. Our experiments demonstrated that the gap between the target and the glass acceptor was critical in the formation and accumulation of nanofibers and it determines the density of the formed nanostructure. The formation mechanism of the nanostructures can be explained by the well-established theory of vapor condensation within the plume induced by ultrafast laser ablation. Experimental results also show that the length of the nanostructure can be controlled by the gap between the target and glass acceptor. Lastly, energy-dispersive x-ray spectroscopy (EDS) analysis shows the oxygen concentration in the nanofibrous structure which is associated with oxidation of ablated material at ambient atmosphere.

scholarly journals Deposition of fibrous nanostructure by ultrafast laser ablation

2021 ◽  
Author(s):  
Amirhossein Tavangar ◽  
Bo Tan ◽  
Krishnan Venkatakrishnan
Keyword(s):  
Laser Ablation ◽  
Research Work ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Vapor Condensation ◽  
Single Step ◽  
Ultrafast Laser ◽  
Ambient Atmosphere ◽  
Pass Through ◽  
Ultrafast Laser Ablation

This research work demonstrated that laser-induced reverse transfer (LIRT) can be used for controllable site-specific deposition of fibrous nanostructure. The LIRT method makes it achievable to generate and deposit fibrous nanostructure of a wide variety of materials on a transparent acceptor in a single-step process at an ambient condition. The deposition of fibrous nanostructure was conducted using ultrafast laser ablation of silicon and aluminum targets placed behind a glass acceptor. Femtosecond laser pulses pass through the transparent acceptor and hit the bulk donor. Consequently a mass quantity of nanoparticles ablates from the donor and then aggregates and forms a porous fibrous nanostructure on the transparent acceptor. Our experiments demonstrated that the gap between the target and the glass acceptor was critical in the formation and accumulation of nanofibers and it determines the density of the formed nanostructure. The formation mechanism of the nanostructures can be explained by the well-established theory of vapor condensation within the plume induced by ultrafast laser ablation. Experimental results also show that the length of the nanostructure can be controlled by the gap between the target and glass acceptor. Lastly, energy-dispersive x-ray spectroscopy (EDS) analysis shows the oxygen concentration in the nanofibrous structure which is associated with oxidation of ablated material at ambient atmosphere.

Molecular Dynamics Simulation of Ultrafast Laser Ablation of Fused Silica

2006 ◽  
Author(s):  
Changrui Cheng ◽  
Xianfan Xu ◽  
Yaguo Wang ◽  
Alejandro Strachan
Keyword(s):  
Molecular Dynamics ◽  
Laser Ablation ◽  
Ultrafast Lasers ◽  
Laser Energy ◽  
Laser Pulses ◽  
Fused Silica ◽  
Ultrafast Laser ◽  
Dynamics Simulation ◽  
Free Electrons ◽  
Ultrafast Laser Ablation

In recent decades, ultrafast lasers have been used successfully to micro-machine fused silica. The high intensity laser pulses first excite valence electrons to the conduction band via photoionization and avalanche ionization. The excited free electrons absorb laser energy, and transfer its energy to the ions, resulting in the temperature rise. This ionization leads to significant changes in Coulomb forces among the atoms. Both thermal and non-thermal (Coulomb explosion) ablation processes have been discussed in the literature [1]. This work applies molecular dynamics technique to study the interaction between ultrafast laser pulses and fused silica and the resulting ablation. The main goal of this work is to investigate the ultrafast laser ablation process of fused silica, and to reveal the mechanisms leading to the material's removal. In this MD simulation, the equilibrium state of fused silica is first established at 300 K, and the laser heating and material removal processes are simulated. The ionization of the material and the energy coupling between the laser beam and free electrons and ions are considered. Thermal and non-thermal mechanisms of fused silica ablation are discussed based on calculation results.

Ultrafast laser ablation of metals with a pair of collinear laser pulses

2008 ◽  
Vol 93 (19) ◽  
pp. 191504 ◽  
Author(s):  
S. Amoruso ◽  
R. Bruzzese ◽  
X. Wang ◽  
J. Xia
Keyword(s):  
Laser Ablation ◽  
Laser Pulses ◽  
Ultrafast Laser ◽  
Ultrafast Laser Ablation

scholarly journals Generation of nanoclusters by ultrafast laser ablation of Al: Molecular dynamics study

2017 ◽  
Vol 1 (6) ◽  
Author(s):  
Alexander Miloshevsky ◽  
Mark C. Phillips ◽  
Sivanandan S. Harilal ◽  
Phillip Dressman ◽  
Gennady Miloshevsky
Keyword(s):  
Molecular Dynamics ◽  
Laser Ablation ◽  
Ultrafast Laser ◽  
Ultrafast Laser Ablation

First on-line analysis of petroleum from single inclusion using ultrafast laser ablation

2010 ◽  
Vol 41 (2) ◽  
pp. 74-77 ◽  
Author(s):  
Herbert Volk ◽  
David Fuentes ◽  
Alexander Fuerbach ◽  
Christopher Miese ◽  
Wolfgang Koehler ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Ultrafast Laser ◽  
Single Inclusion ◽  
On Line ◽  
Line Analysis ◽  
Ultrafast Laser Ablation

scholarly journals Invariance of the r2-ln(F) relationship and attainable precision in ultrafast laser ablation experiments

2021 ◽  
Vol 29 (4) ◽  
pp. 5635
Author(s):  
Boyang Zhou ◽  
Aravinda Kar ◽  
M. J. Soileau ◽  
Xiaoming Yu
Keyword(s):  
Laser Ablation ◽  
Ultrafast Laser ◽  
Ultrafast Laser Ablation

scholarly journals Ultrafast-laser-ablation-assisted spatially selective attachment of fluorescent sensors onto optical fibers

2020 ◽  
Vol 45 (10) ◽  
pp. 2716 ◽  
Author(s):  
Vikram Kamaljith ◽  
Michael G. Tanner ◽  
Harry A. C. Wood ◽  
Kerrianne Harrington ◽  
Debaditya Choudhury ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Optical Fibers ◽  
Fluorescent Sensors ◽  
Ultrafast Laser ◽  
Ultrafast Laser Ablation

scholarly journals Laser ablation of silicon with THz bursts of femtosecond pulses: an experimental and theoretical investigation

2021 ◽  
Author(s):  
Caterina Gaudiuso ◽  
Pavel N. Terekhin ◽  
Annalisa Volpe ◽  
Stefan Nolte ◽  
Bärbel Rethfeld ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Thermal Load ◽  
Laser Pulses ◽  
Ablation Rate ◽  
Pulse Mode ◽  
Femtosecond Laser Pulses ◽  
Photon Absorption ◽  
Burst Frequency ◽  
Two Photon Absorption ◽  
Theoretical Investigations

Abstract In this work, we performed an experimental investigation supported by a theoretical analysis, to improve knowledge on the laser ablation of silicon with THz bursts of femtosecond laser pulses. Laser ablated craters have been created using 200 fs pulses at a wavelength of 1030 nm on silicon samples systematically varying the burst features and comparing to the Normal Pulse Mode (NPM). Using bursts in general allowed reducing the thermal load to the material, however, at the expense of the ablation rate. The higher the number of pulses in the bursts and the lower the intra-burst frequency, the lower is the specific ablation rate. However, bursts at 2 THz led to a higher specific ablation rate compared to NPM, in a narrow window of parameters. Theoretical investigations based on the numerical solution of the density-dependent two temperature model revealed that lower lattice temperatures are reached with more pulses and lower intra-burst frequencies, thus supporting the experimental evidence of the lower thermal load in Burst Mode (BM). This is ascribed to the weaker transient drop of reflectivity, which suggests that with bursts less energy is transferred from the laser to the material. This also explains the trends of the specific ablation rates. Moreover, we found that two-photon absorption plays a fundamental role during BM processing in the THz frequency range.

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