scholarly journals On the Dynamics of Transient Plasmas Generated by Nanosecond Laser Ablation of Several Metals

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7336
Author(s):  
Stefan Andrei Irimiciuc ◽  
Sergii Chertopalov ◽  
Michal Novotný ◽  
Valentin Craciun ◽  
Jan Lancok
Keyword(s):  
Laser Ablation ◽  
Melting Point ◽  
Nanosecond Laser ◽  
Expansion Velocity ◽  
Plasma Properties ◽  
Time Resolved ◽  
Nanosecond Laser Ablation ◽  
The Individual ◽  
Transient Plasma ◽  
The Relationship

The dynamics of transient plasma generated by UV ns-laser ablation of selected metals (Co, Cu, Ag, Bi) were investigated by the Langmuir Probe method in angle- and time-resolved modes. Multiple ionic and electronic structures were seen for all plasmas with some corresponding to anions or nanoparticle-dominated structures. The addition of an Ar atmosphere energetically confined the plasma and increased the charge density by several orders of magnitude. For pressure ranges exceeding 0.5 Pa fast ions were generated in the plasma as a result of Ar ionization and acceleration in the double layer defining the front of the plasma plume. Several correlations between the target nature plasma properties were attempted. The individual plasma structure expansion velocity increases with the melting point and decreases with the atomic mass while the corresponding charged particle densities decrease with the melting point, evidencing the relationship between the volatility of the sample and the overall abated mass.

The influence of material properties on highly time resolved particle formation for nanosecond laser ablation

2018 ◽  
Vol 148 ◽  
pp. 193-204 ◽  
Author(s):  
Markéta Holá ◽  
Jakub Ondráček ◽  
Hana Nováková ◽  
Michal Vojtíšek-Lom ◽  
Romana Hadravová ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Material Properties ◽  
Particle Formation ◽  
Nanosecond Laser ◽  
Time Resolved ◽  
Nanosecond Laser Ablation

Modeling of Pressure Evolution During Nanosecond Laser Ablation of Metal Films

2009 ◽  
Author(s):  
Mohammad Hendijanifard ◽  
David A. Willis
Keyword(s):  
Shock Wave ◽  
Laser Ablation ◽  
Pulse Width ◽  
Metal Films ◽  
Normal Shock ◽  
Nanosecond Laser ◽  
Time Resolved ◽  
Aluminum Films ◽  
Nanosecond Laser Ablation ◽  
Fluid Properties

Nanosecond laser ablation is studied using a theoretical model combined with experimental data from laser ablation of metal films. The purpose of the research is to obtain the recoil pressure boundary condition resulting from explosive phase change. The ablation experiments are performed using a Nd:YAG laser of 1064 nm wavelength and 7 ns pulse width at full width half maximum. Three samples, 200 and 1000 nm aluminum films and 1000 nm nickel films, are used in the experiments. The transient shock wave positions are obtained by a time-resolved shadowgraph technique. A N2-laser pumped dye laser with 3 ns pulse width is used as an illumination source and is synchronized with the ablation laser to obtain the transient shock wave position with nanosecond resolution. The transient shock position is used in a model for finding the shock wave speed as well as the pressure, temperature, and velocity just behind the shock wave. A power law is used for fitting curves on the experimentally obtained shock wave position. Knowing the shock wave position, the normal shock equations are used to calculate the thermo-fluid properties behind the shock wave. The solutions are compared with the Taylor-Sedov solution for spherical shocks and the reason for the deviation is described. The thermo-fluid property results show similar trends for all tested samples. The results show that the Taylor-Sedov solution under-estimates the pressure behind the shock wave when compared to the normal shock results.

Nanosecond Laser Ablation of Titanium in Air and Water: The Time-Resolved Observation and Post-Process Characterizations

2010 ◽  
Author(s):  
Yun Zhou ◽  
Yibo Gao ◽  
Benxin Wu
Keyword(s):  
Laser Ablation ◽  
Surface Profile ◽  
Ablation Rate ◽  
Nanosecond Laser ◽  
Composition Change ◽  
Time Resolved ◽  
Laser Induced Plasma ◽  
Nanosecond Laser Ablation ◽  
Post Process ◽  
Low Efficiency

Titanium has lots of competitive applications in aerospace, biomedical and many other areas due to its special properties. However, the machining of titanium using conventional mechanical approaches often has serious tool wear and low efficiency. Laser ablation can potentially provide a good solution for titanium micromachining. In this paper, nanosecond laser ablation of titanium in air and water has been studied. The laser ablation rate, laser-induced plasma, the ablated surface profile and chemical composition change have been studied, and the results are discussed.

scholarly journals Micro- and nanoparticle generation during nanosecond laser ablation: correlation between mass and optical emissions

2014 ◽  
Vol 22 (4) ◽  
pp. 3991 ◽  
Author(s):  
Santiago Palanco ◽  
Salvatore Marino ◽  
M. Gabás ◽  
Shanti Bijani ◽  
Luis Ayala ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Nanosecond Laser ◽  
Optical Emissions ◽  
Nanosecond Laser Ablation ◽  
Nanoparticle Generation
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