Characterization and uses of plastic hollow fibers for CO2 laser energy transmission

1991 ◽  
Author(s):  
Israel Gannot ◽  
Jacob Dror ◽  
Reuben Dahan ◽  
M. Alaluf ◽  
Nathan I. Croitoru
Keyword(s):  
Co2 Laser ◽  
Laser Energy ◽  
Hollow Fibers ◽  
Energy Transmission

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.

Effects of CO2 laser energy on dentin permeability

1992 ◽  
Vol 18 (6) ◽  
pp. 257-262 ◽  
Author(s):  
E.L. Pashley ◽  
J.A. Horner ◽  
M. Liu ◽  
S. Kim ◽  
D.H. Pashley
Keyword(s):  
Co2 Laser ◽  
Laser Energy ◽  
Dentin Permeability

A pilot study of laser energy transmission through bone and gingiva

2018 ◽  
Vol 149 (8) ◽  
pp. 704-711 ◽  
Author(s):  
Doreen Y. Ng ◽  
Ambrose K. Chan ◽  
Oyku Dalci ◽  
Peter Petocz ◽  
Alexandra K. Papadopoulou ◽  
...  
Keyword(s):  
Pilot Study ◽  
Laser Energy ◽  
Energy Transmission

Experiment of Space Laser Energy Transmission and Conversion with High Efficiency

2013 ◽  
Vol 40 (3) ◽  
pp. 0317001 ◽  
Author(s):  
何滔 He Tao ◽  
杨苏辉 Yang Suhui ◽  
张海洋 Zhang Haiyang ◽  
赵长明 Zhao Changming ◽  
徐鹏 Xu Peng ◽  
...  
Keyword(s):  
High Efficiency ◽  
Laser Energy ◽  
Energy Transmission
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