Laser Microwave Division, U.S. Army Environmental Hygiene Agency
A tutorial guide is presented to provide uniform guidance when performing radiometric measurements upon laser systems to perform a hazard evaluation. This guide was requested by and presented to the Department of Defense (DOD) Laser System Safety Working Group (LSSWG) to serve as a standardized method when performing hazard evaluations primarily upon tactical and training military laser systems including laser rangefinders and designators. Technical information is provided in detail to select a suitable detector, preform radiometric measurements, assess laser system pointing errors, calculate laser pr...
JLA Vol:15 Iss:4 (Design and performance of multilevel phase fan-out diffractive optical elements for laser materials processing)
Itami R&D Laboratories, Sumitomo Electric Industries, Ltd., 1-1-3 Shimaya, Konohana-ku, Osaka 554-0024, Japan
A multilevel phase fan-out diffractive optical element (DOE) has been developed and introduced into various kinds of laser materials processing such as drilling, cutting, welding, and soldering. The larger the number of arrayed spots the DOE generates on the surface of the workpiece, the more sensitive the intensity uniformity of the spots becomes to fabrication errors, which are deviations between designed and fabric...
Dipartimento di Meccanica, Politecnico di Milano, Via Bonardi 9, 20133 Milano, Italy
The present paper is a contribution to the definition of optimal laser hardening conditions with production rate as the main goal. When the part to be treated is given, the optimization problem can be expressed in terms of minimal execution time subjected to two constraints: the depth of treatment and hardness of transformed layer. When the analytical expression of the objective function and the constraints was determined, the feasibility area was described and analyzed. Finally, an optimization algorithm was applied to identify the optimal solut...
JLA Vol:23 Iss:1 (Optimal process parameters for thermoplastic polyetheretherketone joints fabricated using transmission laser welding and Lumogen<sup>®</sup> IR absorptive pigment)
School of Physics, University of Sydney, New South Wales 2006, Australia and Cochlear Ltd., 14 Mars Rd., Lane Cove, New South Wales 2066, Australia
Raymax Applications, P.O. Box 958, Newport Beach, New South Wales 2106, Australia
Natalie L. James
Cochlear Ltd., 14 Mars Rd., Lane Cove, New South Wales 2066, Australia
David R. McKenzie
School of Physics, University of Sydney, New South Wales 2006, Australia
This study investigates the effects of the process parameters (laser power and irradiation time) on the bond quality of transmission laser welded polyether...
JLA Vol:7 Iss:2 (A study of polarization‐maintaining fiber characteristics with applications to force and displacement sensing)
P. V. P. Yupapin
K. T. V. Grattan
A. W. Palmer
An experimental investigation of three different types of highly birefringent fiber sensor element configured as a force and a displacement sensor is described. From the coupling of power between the two eigenmodes, the magnitude of the force and the position of the coupling point can then be determined using ‘white‐light interferometric’ techniques.
Departamento Fı´sica Aplicada Universidade de Vigo, Lagoas Marcosende 9, E-36200 VIGO, Spain
Laser Engineering Group, Department of Engineering, The University of Liverpool, Liverpool L69 3GH, United Kingdom
Slate is a natural stone which has the characteristic that shows a well-developed defoliation plane, allowing to easily split it in plates parallel to that plane which are particularly used as tiles for roof building. At present, the manufacturing of slate is mostly manual, bein...
JLA Vol:18 Iss:2 (Investigation of the effects of nonconventional beam geometries in laser surface treatment of ceramics: Theoretical analysis)
Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M60 1QD, United Kingdom and Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 IQD, United Kingdom
Laser Processing Research Center, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M60 1QD, United Kingdom
F. H. Stott
Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 1QD, United Kingdom
Laser surface treatment of ceramics by melting and re...
JLA Vol:25 Iss:3 (Surface tension stabilized laser welding (donut laser welding)—A new laser welding technique)
Department of Engineering Sciences and Mathematics, Luleå University of Technology and Westinghouse Electric Sweden AB, SE-721 63 Va¨sterås, Sweden
Department of Engineering Sciences and Mathematics, Luleå University of Technology
A new laser welding process is presented which delivers a porosity free, spatter free weld. The process involves a donut shaped melt with a central hole of the same order of magnitude as the material thickness. The laser illuminates only the leading section of this melt. The hole is kept open by the melt surface tension.
JLA Vol:9 Iss:5 (Experimental development of a machining database for the CO<sub>2</sub> laser cutting of ceramic tile)
S. A. J. Livingstone
K. L. Chua
Department of Mechanical and Chemical Engineering, Heriot‐Watt University, Riccarton, Edinburgh EH14 4AS, U.K.
This paper covers the cutting of commercially‐available ceramic tiles using a CO2 laser cutting machine, with the object of producing a laser beam machining database which contains the essential parameter information for their successful processing. Various laser cutting parameters were investigated that would generate a cut in ceramic tile which required minimal posttreatment. The effects of various shield gases, multipass cutting and underwater cutting were also examined.
Mary H. McCay
T. Dwayne McCay
Narendra B. Dahotre
C. Michael Sharp
Center for Laser Applications, University of Tennessee Space Institute, Tullahoma, Tennessee 37388
Metal matrix composites continue to be desirable structural materials but difficulties in joining limit their usefulness. This paper describes the results of a study on the laser welding of A356‐AI/SiC particulate composites. Three separate processing regimes are identified based upon analytical model predictions and metallographic analysis of the solidification structures.
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