scholarly journals Hole Drilling in Polymethyl Methacrylate (PMMA) Using CO2 Laser

2014 ◽  
Vol 7 (1) ◽  
pp. 30-39
Author(s):  
Rana M. Taha
Keyword(s):  
Laser Beam ◽  
Polymethyl Methacrylate ◽  
Co2 Laser ◽  
Exposure Time ◽  
Laser Annealing ◽  
Hole Drilling ◽  
Work Piece ◽  
Drilling Tool ◽  
Hole Depth ◽  
Penetration Velocity

Laser sources are used in a large variety of applications for material processing. It is mainly used for welding, cutting, drilling, laser annealing, etc. This study narrows the scope down to one of the process, namely, laser drilling.The hole depth, width and penetration velocity of evaporation depend on different parameters such as power, material, exposure time, distance between drilling tool and the material, the drilling tool, etc. In this paper; the laser beam was used as drilling tool. 16W CO2 laser (10.6μm) and transparent Perspex (PMMA) which is the abbreviation of polymethyl methacrylate work piece with 8mm thickness were used. The distance between laser beam and the material was 5cm. Different powers for CO2 laser were used for different exposure time. Hole depth, time required for boiling, heat flow per unit area and penetration velocity of evaporation were calculated. Measured and calculated results were approximately the same. Many figures which representing the relations between laser power, time to reach boiling, hole width, hole depth and exposure time were obtained by using Matlab 2008 software program

Influence of Cu Surface Treatment on the Cu-Direct Via Hole Drilling Efficiency of PWBs

2007 ◽  
Author(s):  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Keiji Ogawa ◽  
Shogo Matsutani
Keyword(s):  
Laser Beam ◽  
Surface Treatment ◽  
Co2 Laser ◽  
Copper Foil ◽  
Copper Surface ◽  
Surface Shape ◽  
Hole Drilling ◽  
Black Oxide ◽  
Direct Drilling ◽  
The Relationship

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 buildup layer are melted at the same time, and the surface is treated to increase the laser energy absorbed by the copper foil because an untreated copper surface reflects most of the 10.6-μm-wavelength CO2 laser beam. We used black-oxide and V-bond treatments as surface treatment. Previously, the only black-oxide treatment was paid attention to, but the new V-bond treatment is also investigated in this report. First, a straightforward method employing infrared thermography was proposed to determine the absorbance of the CO2 laser beam by the copper surface. Then, we used SEM to characterize the copper surfaces after surface treatment, and established the relationship between laser absorbance and surface shape. Subsequently, we observed the circumference of a point irradiated with the CO2 laser and explained melting processes were different from surface shape. Finally, we investigated the relationship between laser absorbance and BVH quality, and showed that a high absorbance improved BVH quality.

scholarly journals Precise Hole Drilling in PMMA Using 1064 nm Diode Laser CNC Machine

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Jinan A. Abdulnabi ◽  
Thaier A. Tawfiq ◽  
Anwaar A. Al-Dergazly ◽  
Ziad A. Taha ◽  
Khalil I. Hajim
Keyword(s):  
Laser Beam ◽  
Diode Laser ◽  
Output Power ◽  
Analytical Model ◽  
Exposure Time ◽  
Low Pressure ◽  
Experimental Results ◽  
Laser Spot ◽  
Hole Drilling ◽  
Cnc Machine

This paper represents the outcome of efforts that intended to achieve laser hole drilling execution in polymethylmethacrylate (PMMA) of 2.5 mm thickness using 1064 nm diode laser of 5 W output power. Different laser beam powers, exposure time, and positions of the laser spot were taken into consideration with respect to the workpiece. The workpieces were tested in the existence of low-pressure assist gas (20–60 mmHg of air). The experimental results were supported by the predicted results of the analytical model.

Mechanical properties and fatigue behavior of CO2 laser beam welded armor steel joints

2020 ◽  
Vol 62 (7) ◽  
pp. 689-697
Author(s):  
Zulkuf Balalan ◽  
Furkan Sarsilmaz ◽  
Omer Ekinci
Keyword(s):  
Mechanical Properties ◽  
Laser Beam ◽  
Co2 Laser ◽  
Fatigue Behavior ◽  
Armor Steel ◽  
Steel Joints

scholarly journals Treatment of Bartholin gland cyst with CO2laser

2016 ◽  
Vol 14 (1) ◽  
pp. 25-29 ◽  
Author(s):  
Neila Maria de Góis Speck ◽  
Karol Pereira Ruela Boechat ◽  
Georgia Mouzinho Lima dos Santos ◽  
Julisa Chamorro Lascasas Ribalta
Keyword(s):  
Laser Beam ◽  
Co2 Laser ◽  
Laser Surgery ◽  
Skin Incision ◽  
Co2 Laser Surgery ◽  
Results Of Treatment

ABSTRACT Objective To describe the results of treatment with CO2 laser for Bartholin gland cysts. Methods Thirty-one women with Bartholin gland cysts were treated with CO2laser at an outpatient´s setting. Skin incision was performed with focused laser beam, the capsule was opened to drain mucoid content, followed by internal vaporization of impaired capsule. Results There were no complications. Five patients had recurrence of the cyst and were submitted to a second and successful session. Conclusion CO2 laser surgery was effective to treat Bartholin gland cysts with minimal or no complications, and can be performed at an outpatient´s setting.

CO2 laser annealing of Ge core fibers with different core diameters

2021 ◽  
Vol 66 ◽  
pp. 102645
Author(s):  
Ziwen Zhao ◽  
Jianbo Zhang ◽  
Shaoye Wang ◽  
Yifan Du ◽  
Li Ren
Keyword(s):  
Co2 Laser ◽  
Laser Annealing
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