Producing Three-Dimensional Shapes by Laser Milling

1990 ◽  
Vol 112 (4) ◽  
pp. 375-379 ◽  
Author(s):  
R. K. C. Hsu ◽  
S. M. Copley
Keyword(s):  
Carbon Dioxide ◽  
Laser Beam ◽  
Carbon Dioxide Laser ◽  
Three Dimensional ◽  
Milling Process ◽  
Model Material ◽  
Layer Plane ◽  
Uniform Thickness ◽  
Laser Milling ◽  
Focused Beam

A laser milling process employing a pulsed, carbon dioxide laser has been investigated using graphite as a model material. Material is removed by scanning the focused beam across the surface of the workpiece leaving behind a series of narrow, parallel, overlapping grooves. These grooves, together, constitute the removal of a thin layer of uniform thickness lying parallel to a layer plane. In order to remove layers bounded at the edge by upright walls perpendicular to the layer plane, the laser beam must be tilted with respect to the layer plane. Using this approach, it is possible to produce perpendicular steps and cylindrical surfaces.

Carbon Dioxide Laser Beam Control for Corneal Surgery

1981 ◽  
Vol 12 (2) ◽  
pp. 117-122
Author(s):  
Richard H Keates ◽  
Leno S Pedrotti ◽  
Hugo Weichel ◽  
William H Possel
Keyword(s):  
Carbon Dioxide ◽  
Laser Beam ◽  
Carbon Dioxide Laser ◽  
Corneal Surgery ◽  
Beam Control

scholarly journals CO2 Transoral Laser Microsurgery in Benign, Premalignant and Malignant (Tis, T1, T2) Lesion of the Glottis. A Literature Review

Medicines ◽  
2019 ◽  
Vol 6 (3) ◽  
pp. 77 ◽  
Author(s):  
Carlos Miguel Chiesa-Estomba ◽  
Jose Angel González-García ◽  
Ekhiñe Larruscain ◽  
Christian Calvo-Henríquez ◽  
Miguel Mayo-Yáñez ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Laser ◽  
Narrow Band Imaging ◽  
Preoperative Evaluation ◽  
Three Dimensional ◽  
Glottic Carcinoma ◽  
Transoral Laser Microsurgery ◽  
Laser Microsurgery ◽  
Larynx Preservation ◽  
Staging Systems

Carbon Dioxide transoral laser microsurgery represents a reliable option for the treatment of early glottic carcinoma (Tis–T2), with good functional and oncological outcomes, nowadays representing one of the main options in larynx preservation protocols. The development and improvement of laser devices means surgeons are able to use more precise instruments compared with classic cold dissection in laser-assisted phonosurgery. Secondary effects on voice, swallowing, or quality of life as well as complications have been well documented. Also, with the introduction of a new proposal for staging systems following the principle of the three-dimensional map of isoprognostic zones, the use of narrow-band imaging in clinical evaluation and intraoperative, and the implementation of diffusion-weighted magnetic resonance during preoperative evaluation, the development of new tools to improve surgical quality and preliminary reports regarding the use of carbon dioxide laser in transoral robotic surgery suggests an exciting future for this technique.

3D Simulation of Laser Assisted Side Milling of Ti6Al4V Alloy Using Modified Johnson-Cook Material Model

2013 ◽  
Vol 554-557 ◽  
pp. 2054-2061 ◽  
Author(s):  
Hassan Zamani ◽  
Jan Patrick Hermani ◽  
Bernhard Sonderegger ◽  
Christof Sommitsch
Keyword(s):  
Tool Wear ◽  
Laser Beam ◽  
Cutting Forces ◽  
Three Dimensional ◽  
Material Model ◽  
Element Model ◽  
Milling Process ◽  
Machining Processes ◽  
Side Milling ◽  
Three Dimensional Finite Element

During machining of hard materials, one approach to reduce tool wear is using a laser beam to preheat the material in front of the cutting zone. In this study, a new concept of laser-assisted milling with spindle and tool integrated laser beam guiding has been tested. The laser beam is located at the cutting edge and moving synchronously with the cutter. In experiment, a reduction in the resulting process cutting forces and tool wear has been observed in comparison to milling without laser. A three-dimensional finite element model in DEFORM 3D was developed to predict the cutting forces in the milling process with and without an additional laser heat source, based on a Johnson-Cook-type material constitutive model adapted for high strains and strain rates. Both in experiment and simulation, the deformation behavior of a Ti-6Al-4V workpiece has been investigated. The comparison of the resulting cutting forces showed very good agreement. Thus the new model has great potential to further optimize laser assisted machining processes.

Comparative experimental study on the use of the carbon dioxide laser beam in partial nephrectomy

1982 ◽  
Vol 2 (1) ◽  
pp. 73-80 ◽  
Author(s):  
Benjamin Barzilay ◽  
Graciela Lijovetzky ◽  
Saul Perlberg ◽  
Marco Caine
Keyword(s):  
Carbon Dioxide ◽  
Experimental Study ◽  
Laser Beam ◽  
Partial Nephrectomy ◽  
Carbon Dioxide Laser

Treatment of cervical intraepithelial neoplasia with the carbon dioxide laser beam

1978 ◽  
Vol 131 (8) ◽  
pp. 831-836 ◽  
Author(s):  
Robert Carter ◽  
Kermit E. Krantz ◽  
Glenn S. Hara ◽  
Fritz Lin ◽  
Byron J. Masterson ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Laser Beam ◽  
Cervical Intraepithelial Neoplasia ◽  
Carbon Dioxide Laser ◽  
Intraepithelial Neoplasia

scholarly journals Effect of laser beam trajectory on pocket geometry in laser micromachining

2020 ◽  
Vol 10 (1) ◽  
pp. 830-838 ◽  
Author(s):  
Grzegorz Witkowski ◽  
Szymon Tofil ◽  
Krystian Mulczyk
Keyword(s):  
Laser Beam ◽  
Surface Condition ◽  
Experimental Tests ◽  
Laser Micromachining ◽  
Milling Process ◽  
Beam Trajectory ◽  
Laser Milling ◽  
Observation Methods ◽  
The Impact ◽  
Ablative Laser

AbstractThe article presents the problem of planning the laser beam trajectory for the laser micromachining process. The article concerns on the ablative laser micromachining issues. Different effects of laser beam trajectory on pocket geometry in laser micromachining were investigated. The results of experimental tests are presented. Based on the research, potential causes of different effects of the laser beam for various trajectories were formulated. Several different types of trajectories for the assumed shape were developed for the purposes of the research. Laser micromachining was performed with fixed parameters of the laser device using different trajectories. The article indicates the significant impact of the laser beam trajectory on the effect of interaction on matter during the laser milling process, which is not often mentioned in scientific reports. The article presents the basic geometrical measurements indicating the need to determine the leading of the laser beam. Studieswere conducted using the microscopic observation methods and interferometric methods for estimating the surface condition. The article indicates the need for extensive research focusing on the mechanism of the impact of the laser beam scan strategy on the effect on the material during ablative laser machining. The article summarizes the analysis and discussion of research results.

Universal Endoscopic Coupler for Carbon Dioxide Laser Surgery

1982 ◽  
Vol 91 (6) ◽  
pp. 608-609 ◽  
Author(s):  
Robert H. Ossoff ◽  
Marc S. Karlan
Keyword(s):  
Carbon Dioxide ◽  
Laser Beam ◽  
Laser Surgery ◽  
Carbon Dioxide Laser ◽  
Safety Features ◽  
Helium Neon

A new set of endoscopic couplers has been designed by the authors for laparoscopic, arthroscopic and bronchoscopic carbon dioxide laser surgery. Certain safety features have been incorporated into this design which heretofore have been unavailable. The bronchoscopic coupler was designed with a gimbeled, partially reflective germanium window to facilitate direct, coaxial vision with the laser beam. A “joy stick” has been incorporated into the design to allow the surgeon to manipulate the helium-neon-aiming laser within the lumen of the bronchoscope. Bronchoscopes as small as 4 mm in diameter and 30 to 40 cm in length have been used with this coupler.

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