• JLA Vol:17 Iss:3 (High-speed scanning laser-induced breakdown spectroscopy at 1000 Hz with single pulse evaluation for the detection of inclusions in steel)

    Holger Bette
    Reinhard Noll
    Fraunhofer-Institut fu¨r Lasertechnik (ILT), Steinbachstr. 15, 52074 Aachen, Germany

    Gregor Mu¨ller
    Hans-Werner Jansen
    C¸etin Nazikkol
    Horst Mittelsta¨dt
    ThyssenKrupp Stahl AG, Kaiser-Wilhelm-Str. 100, 47166 Duisburg, Germany

    Spatially resolved information about the distribution and chemical composition of inclusions in steel are gained by scanning methods, such as scanning electron microscopy with energy dispersive X-ray spectroscopy, electron probe microanalysis or capillary-X-ray flourescence. Scanning laser-induced breakdown spectroscopy (LIBS) offers dis...


  • JLA Vol:22 Iss:1 (Finite volume model for laser-soot interaction for a laser transmission welding process)

    L. S. Mayboudi
    A. M. Birk
    G. Zak
    Mechanical and Materials Engineering, Queen’s University, Kingston, Ontario K7L 3N6, Canada

    P. J. Bates
    Chemistry and Chemical Engineering, Royal Military College, Kingston, Ontario K7K 7B4, Canada

    Laser transmission welding, a technique to join thermoplastic components, involves a laser beam passing through a laser-transmitting part being absorbed by a laser-absorbing part at the weld interface. The heat generated at the interface melts a thin layer of the plastic in both parts and forms a joint. Laser-absorbing agents such as dyes or soot particles are added to the laser-absorbing part to...


  • JLA Vol:8 Iss:4 (Acoustic emission from modulated laser beam welding of materials)

    Hongping Gu
    W. W. Duley
    Guelph‐Waterloo Program for Graduate Work in Physics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1

    Acoustic emission during the laser welding of metals with a modulated CO2 laser beam has been investigated. Sharp resonances at many frequencies in the acoustic emission spectra have been observed. This was most noticeable when the average laser power was high enough to produce full penetration welds whose acoustic emission at high harmonics with frequencies that overlap with bands of vibrational frequencies corresponding to eigenmodes of the keyhole are greatly enhanced. Lower harmonics were not clearly observe...


  • JLA Vol:2 Iss:2 (Infrared Optical Fibers for Surgical Applications)

    R. W. Waynant
    M. N. Ediger
    M. Fink
    Center for Devices and Radiological Health, Food and Drug Administration, 5600 Fishers Lane, Rockville, MD 20857

    The basic characteristics of fibers that are appropriate for surgical use in the infrared are reviewed. New fiber materials, such as sapphire, fluorozirconate and chalcogenide glasses, and polycrystalline fibers are discussed as well as their applicability for surgical procedures.


  • JLA Vol:1 Iss:3 (Experimental Laser Welding Thermal Cycles)

    E. A. Metzbower
    U.S. Naval Research Laboratory, Code 6324, Washington, DC 20375‐5000, U.S.A.


  • JLA Vol:15 Iss:4 (Excimer laser fabrication of polymer microfluidic devices)

    Joohan Kim
    Xianfan Xu
    School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907

    Silicon has been a primary material for fabrication of microelectromechanical systems (microfluidic devices in MEMS) for several decades. This is due to the fact that the MEMS techniques were derived from those used for microfabrication in the semiconductor industry. These techniques are well developed, and can be readily applied for silicon based MEMS fabrication. Nowadays, alternative manufacturing materials and techniques are needed for reducing costs and meeting new requirements. Polymers have many advantages because of their low costs and applications in ...


  • JLA Vol:20 Iss:1 (Dynamic bidirectional reflectance distribution functions: Measurement and representation)

    Albert W. Bailey
    Edward A. Early
    Kenneth S. Keppler
    Victor I. Villavicencio
    Northrop Grumman, 4241 Woodcock Drive, Suite B-100, San Antonio, Texas 78238

    Paul Kennedy
    Robert J. Thomas
    Justin J. Zohner
    Human Effectiveness Directorate, Directed Energy Bioeffects Division, Optical Radiation Branch, Air Force Research Laboratory, 2624 Louis Bauer Drive, Brooks City-Base, Texas 78235

    George Megaloudis
    Northrop Grumman, 100 Brickstone Square, Andover, Massachusetts 01810

    With high-energy lasers, not only the direct laser beam can pose significant eye and skin hazards, but als...


  • JLA Vol:24 Iss:4 (Synthesis of hybrid microgels by coupling of laser ablation and polymerization in aqueous medium)

    Philipp Nachev
    Funktionale und Interaktive Polymere, Institut fu¨r Makromolekulare und Technische Chemie, RWTH Aachen University, Forckenbeckstr. 50, D-52074 Aachen, Germany

    Danielle D. van ’T Zand
    Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstr. 5-7, D-45141 Essen, Germany

    Vincent Coger
    Department of Plastic, Hand- and Reconstructive Surgery, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany

    Philipp Wagener
    Technical Chemistry I and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universit...


  • JLA Vol:5 Iss:1 (Intercomparison between a C‐Series Reference Calorimeter and Two Commercially Available Laser Power/Energy Meters)

    Kirsti Leszczynski
    Finnish Centre for Radiation and Nuclear Safety, SF‐00101 Helsinki, Finland

    Robert W. Faaland
    Center for Devices and Radiological Health, Rockville, Maryland 20857

    An intercomparison between a C‐series reference calorimeter and two commercially available laser power/energy meters has been undertaken. The intercomparison has been performed at three visible laser wavelengths (488.0 nm, 514.5 nm, and 632.8 nm) and one near infrared laser wavelength (1064.0 nm). Power and energy levels presented to the instruments ranged from approximately 0.1 mW to 20 W and from 0.9 mJ to 16 J. One of the power/energy meters has a volume ab...


  • JLA Vol:14 Iss:2 (An investigation of rapid prototyping of sand casting molds by selective laser sintering)

    G. Casalino
    L. A. C. De Filippis
    A. D. Ludovico
    L. Tricarico
    Dipartimento di Ingegneria Meccanica e Gestionale, Politecnico di Bari, 70126 Bari, Italy

    Among the layer fabrication techniques, selective laser sintering (SLS), is widely used for manufacturing various products made of different materials (i.e., polycarbonates, nylons, polyamides, sand casting, metal powders, and others). The SLS of precoated foundry sands allows the aggregation of adjacent particles, which are then cemented by furnace heat treatment. Moreover, geometrically complex molds and cores not obtainable with conventional methods can be realized by this method. In th...



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