scholarly journals CO2 Laser Absorption in Ablation Plasmas

2006 ◽  
Author(s):  
Hans-Albert Eckel
Keyword(s):  
Co2 Laser ◽  
Laser Absorption

Plasma Diagnostics Using CO2 Laser Absorption and Interferometry

1972 ◽  
Vol 43 (2) ◽  
pp. 574-577 ◽  
Author(s):  
A. A. Offenberger ◽  
R. D. Kerr ◽  
P. R. Smy
Keyword(s):  
Co2 Laser ◽  
Plasma Diagnostics ◽  
Laser Absorption

Optoacoustic cross-section measurements for ir pulses: CO2 laser absorption by CF3I

1981 ◽  
Vol 24 (4) ◽  
pp. 363-368 ◽  
Author(s):  
J. M. Weulersse ◽  
R. Genier
Keyword(s):  
Cross Section ◽  
Co2 Laser ◽  
Laser Absorption

Cu-Direct Via-Hole Drilling of Aramid Fiber Reinforced Build-Up Layer by CO2 Laser Beam

2005 ◽  
Author(s):  
Eiichi Aoyama ◽  
Toshiki Hirogaki ◽  
Keiji Ogawa ◽  
Nobuyuki Doi ◽  
Ryu Minagi
Keyword(s):  
Co2 Laser ◽  
Copper Foil ◽  
Effective Means ◽  
Hole Diameter ◽  
Hole Drilling ◽  
Printed Wiring Boards ◽  
Laser Absorption ◽  
Direct Laser ◽  
Via Hole ◽  
The Difference

This report describes the features of Cu-direct laser drilled hole quality on multi-layer Printed Wiring Boards (PWBs). Cu-direct laser drilling drills the outer copper foil and build-up layer at the same time, which makes it difficult to form a blind via hole (BVH) with high quality because the copper foil has high reflection coefficient for a CO2 laser with wavelength 10.6 μm. Therefore, this study focused on improving drilled hole qualities such as diameter and overhang. First, the influence of laser irradiation conditions on forming BVH and the drilled hole diameter were investigated in detail. Second, a new method employing thermography was proposed in order to evaluate the absorption of copper foil after surface treatment. Third, the effect of mixing fillers into the build-up layer in order to reduce the amount of overhang was shown to be effective both experimentally and theoretically. As a result, it is clear that decreasing the difference in the laser absorption rate of the outer copper foil is an effective means to control the hole diameter and reducing the heat characteristic difference between the outer copper foil and the build-up layer can effectively decrease overhang.

CO2 laser absorption in SF6-air boundary layers

1989 ◽  
Vol 3 (3) ◽  
pp. 353-355
Author(s):  
H. F. Nelson ◽  
E. A. Eiswirth
Keyword(s):  
Boundary Layers ◽  
Co2 Laser ◽  
Laser Absorption

The Intra-cavity Mode Competition and Laser Absorption Spectroscopy with CO2 Laser

Optik ◽  
2014 ◽  
Vol 125 (10) ◽  
pp. 2248-2255
Author(s):  
Hamze Fuladvand ◽  
Amin Salehi ◽  
Nader Daneshfar ◽  
Alireza Bahrampour ◽  
Reza Farrahi Moghaddam
Keyword(s):  
Absorption Spectroscopy ◽  
Co2 Laser ◽  
Cavity Mode ◽  
Mode Competition ◽  
Laser Absorption Spectroscopy ◽  
Laser Absorption

scholarly journals Investigation of Laser-material Interaction in Case of Aluminium Brazing Process

2018 ◽  
Author(s):  
Tamás Markovits ◽  
András Jászberényi
Keyword(s):  
Co2 Laser ◽  
Laser Heating ◽  
Laser Energy ◽  
Research Work ◽  
Base Material ◽  
Laser Source ◽  
Laser Material ◽  
Heating Source ◽  
Laser Absorption ◽  
Material Interaction

This research work is connected to the applicability of laser source in case of brazing of aluminium materials. Based on our earlier research results it become clear that the brazing flux material is able to improve the laser absorption in case CO2 laser source. A new brazing flux material (Fontargen F 400 MD EVO2) and the CO2 laser interactions were investigated to determine the applicability of laser as a heating source. The application of laser strongly depend on the value of absorption of laser energy into the aluminium base material. From our new result it can be seen that the applied flux can improve the laser absorption, thus the laser heating, but the implementation of brazing process with this flux material brings further challenges.

Effect of Surface Roughness on CO2 Laser Absorption by 316L Stainless Steel and Aluminum

2019 ◽  
Vol 8 (6) ◽  
pp. 20180091
Author(s):  
M. Ahmed Obeidi ◽  
E. McCarthy ◽  
S. I. Ubani ◽  
I. Ul Ahad ◽  
D. Brabazon
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Co2 Laser ◽  
316L Stainless Steel ◽  
Laser Absorption ◽  
Effect Of Surface
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