Multilayer structure of ablation plume of standard geological sample irradiated by Nd:YAG nanosecond laser using shadowgraph technology

2019 ◽  
Vol 125 (2) ◽  
pp. 023102
Author(s):  
Zihan Li ◽  
Yong Jiang ◽  
Rong Qiu ◽  
Jiuling Meng ◽  
Yang Hu ◽  
...  
Keyword(s):  
Multilayer Structure ◽  
Geological Sample ◽  
Ablation Plume ◽  
Nanosecond Laser

Nanosecond laser-induced breakdown assisted by femtosecond laser pre-ionization in air: the effect on spatial resolution and continuous radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20701
Author(s):  
Bo Li ◽  
Xiaofeng Li ◽  
Zhifeng Zhu ◽  
Qiang Gao
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Threshold ◽  
Powerful Technique ◽  
Breakdown Spectroscopy ◽  
Continuous Radiation ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for quantitative diagnostics of gases. The spatial resolution of LIBS, however, is limited by the volume of plasma. Here femtosecond-nanosecond dual-pulsed LIBS was demonstrated. Using this method, the breakdown threshold was reduced by 80%, and decay of continuous radiation was shortened. In addition, the volume of the plasma was shrunk by 85% and hence, the spatial resolution of LIBS was significantly improved.

Mechanisms of Dopant Depth Profile Modification During Mass Spectrometric Analysis of Multilayer Structure

2015 ◽  
Vol 60 (6) ◽  
pp. 511-520 ◽  
Author(s):  
A.A. Efremov ◽  
◽  
V.G. Litovchenko ◽  
V.P. Melnik ◽  
O.S. Oberemok ◽  
...  
Keyword(s):  
Depth Profile ◽  
Multilayer Structure ◽  
Mass Spectrometric ◽  
Mass Spectrometric Analysis ◽  
Spectrometric Analysis ◽  
Profile Modification

In Situ Assembly of LDPE/PA6 Multilayer Structure by Stirring

2020 ◽  
Vol 35 (1) ◽  
pp. 58-69
Author(s):  
P. Pongmuksuwan ◽  
W. Harnnarongchai
Keyword(s):  
Multilayer Structure

The formation of a multilayer structure with integrated membranes based on channel silicon

2020 ◽  
Author(s):  
V. V. Bolotov ◽  
K. E. Ivlev ◽  
E. V. Knyazev ◽  
I. V. Ponomareva ◽  
V. E. Roslikov
Keyword(s):  
Multilayer Structure

scholarly journals Investigation of Multiparameter Laser Stripping of AlTiN and DLC C Coatings

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 951
Author(s):  
Tomáš Primus ◽  
Josef Hlavinka ◽  
Pavel Zeman ◽  
Jan Brajer ◽  
Martin Šorm ◽  
...  
Keyword(s):  
Surface Roughness ◽  
High Efficiency ◽  
Steel Substrate ◽  
Cutting Tools ◽  
High Hardness ◽  
Working Time ◽  
Nanosecond Laser ◽  
Altin Coating ◽  
Successful Removal ◽  
Frequency Laser

The lifetime and properties of cutting tools and forming moulds can be prolonged and enhanced by the deposition of hard, thin coatings. After a certain period of usage, the coating will deteriorate. Any remaining coating must be removed prior to successful recoating. Laser stripping is a fast and environmentally friendly coating removal method. In this paper, we present laser removal of two types of coatings deposited on a 1.2379 tool steel substrate, namely, an AlTiN coating with high hardness and a DLC C coating with a small coefficient of friction (COF). A powerful nanosecond laser was employed to remove the coating from the substrate with high efficiency, along with suitable residual surface roughness. Measurements were taken of surface roughness, removed depth, and working time on a stripped area of 1 cm2. The samples were evaluated under a microscope, with a 3D profilometer, and by EDS chemical analysis. Successful removal of the coating was confirmed by optical analysis, but detailed chemical characterisation showed that about 30% of the coating element may remain on the surface. Moreover, a working time of less than 7.5 s per cm2 was obtained in this study. In addition, it was shown that the application of a second low energy, high frequency laser beam pass leads to remelting of the peaks of the material and reduced surface roughness.

Nanosecond laser cleaning for enhanced zinc coating quality of HSLA steel

2021 ◽  
Vol 143 ◽  
pp. 107311
Author(s):  
Lixin Zhu ◽  
Qing Gao ◽  
Bingtao Sun ◽  
Yongjun Ke ◽  
Yang Tan ◽  
...  
Keyword(s):  
Hsla Steel ◽  
Zinc Coating ◽  
Laser Cleaning ◽  
Nanosecond Laser ◽  
Coating Quality
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