CO2 Laser-induced plasma formation on a copper surface covered by dielectric particles

1989 ◽  
Vol 48 (3) ◽  
pp. 283-287 ◽  
Author(s):  
S. Jovićević ◽  
N. Konjević ◽  
N. I. Chapliev ◽  
V. I. Konov ◽  
S. M. Pimenov
Keyword(s):  
Co2 Laser ◽  
Copper Surface ◽  
Plasma Formation ◽  
Laser Induced Plasma ◽  
Dielectric Particles

Cu-Direct Laser Drilling of Blind Via-Hole in Multi-Layer PWBs: Influence of Surface Treatment on Drilled Hole Quality

2009 ◽  
Author(s):  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Keiji Ogawa ◽  
Tsukasa Ayuzawa
Keyword(s):  
Surface Treatment ◽  
Co2 Laser ◽  
Copper Foil ◽  
Laser Energy ◽  
Copper Surface ◽  
Laser Drilling ◽  
Hole Quality ◽  
Direct Laser ◽  
Overhang Length ◽  
Direct Drilling

This report describes the quality assessment of Blind Via Holes (BVHs) of Printed Wiring Boards (PWBs) drilled by a CO2 laser using Cu-direct drilling. In the Cu-direct drilling method, the copper foil and the build-up layer are melted at the same time, and the surface is treated to increase the laser energy absorbed by the copper foil since an untreated copper surface reflects most of the 10.6-μm-wavelength CO2 laser beam. However, there are few reports dealing with Cu-direct laser drilling of PWBs. In addition, when copper and resin with different processing thresholds are drilled at the same time, occurrences of a defect called overhang have been observed. So, in this report, first we propose a new method using thermography to measure the absorptance of a PWB surface for a CO2 laser. Moreover, we investigate how surface treatment of the outer copper foil influences the quality of a laser-drilled hole. Then, we observe the circumference of a point irradiated with the CO2 laser and explain how melting processes are different from surface treatment. Finally, based on the research we establish a method in order to cut down the overhang length as a parameter of drilled-hole quality. We also show that a high absorptance improves BVH quality.

scholarly journals Food powder analysis by using transversely excited atmospheric CO2 laser-induced plasma spectroscopy

2015 ◽  
Vol 622 ◽  
pp. 012057 ◽  
Author(s):  
Ali Khumaeni ◽  
Zener Sukra Lie ◽  
Wahyu Setiabudi ◽  
Koo Hendrik Kurniawan ◽  
Kiichiro Kagawa
Keyword(s):  
Co2 Laser ◽  
Atmospheric Co2 ◽  
Plasma Spectroscopy ◽  
Laser Induced Plasma ◽  
Food Powder ◽  
Powder Analysis

Laser induced plasma formation by picosecond pulse irradiation

1993 ◽  
Vol 69 (1-4) ◽  
pp. 290-298 ◽  
Author(s):  
W. Marine ◽  
M. Gerri ◽  
P. Thomsen-Schmidt ◽  
J.M. Scotto d'Aniello
Keyword(s):  
Picosecond Pulse ◽  
Plasma Formation ◽  
Pulse Irradiation ◽  
Laser Induced Plasma

Analysis of copper surface features obtained using TEA CO2 laser at reduced air pressure

2013 ◽  
Vol 270 ◽  
pp. 486-494 ◽  
Author(s):  
M. Momcilovic ◽  
M. Trtica ◽  
J. Ciganovic ◽  
J. Savovic ◽  
J. Stasic ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Copper Surface ◽  
Air Pressure ◽  
Tea Co2 Laser ◽  
Surface Features

Momentum transfer and plasma formation above a surface with a high‐power CO2 laser

1972 ◽  
Vol 21 (3) ◽  
pp. 79-81 ◽  
Author(s):  
A.N. Pirri ◽  
R. Schlier ◽  
D. Northam
Keyword(s):  
Momentum Transfer ◽  
Co2 Laser ◽  
High Power ◽  
Plasma Formation

Influence of optical aberrations on laser-induced plasma formation in water and their consequences for intraocular photodisruption

1998 ◽  
Author(s):  
Alfred Vogel ◽  
Kester Nahen ◽  
Dirk Theisen ◽  
Reginald Birngruber ◽  
Robert J. Thomas ◽  
...  
Keyword(s):  
Plasma Formation ◽  
Optical Aberrations ◽  
Laser Induced Plasma
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