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


    Authors:
    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...

    $25.00

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


    Authors:
    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.

    $25.00

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


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


    $25.00

  • JLA Vol:16 Iss:3 (Methods for hazard assessment from viewing fiber optics with eye loupes)


    Authors:
    Wesley J. Marshall
    U.S. Army Center for Health Promotion and Preventive Medicine, Aberdeen Proving Ground, Maryland 21010-5403

    John Bell
    Terabeam Corporation, Redmond, Washington

    David H. Sliney
    U.S. Army Center for Health Promotion and Preventive Medicine, Aberdeen Proving Ground, Maryland 21010-5403


    Current laser safety standards overestimate retinal hazards when viewing optical fiber tips with magnifying aids. Methods for assessing optical hazards are based on laser beam characteristics and assume worst-case exposure to both the unaided eye and when using a variety of optical aids. These standard methods provide overly conservati...

    $25.00

  • JLA Vol:21 Iss:1 (Two-laser deflashing of heat sinks in integrated circuit packages)


    Authors:
    W. D. Song
    Q. Xie
    Data Storage Institute, Agency of Science, Technology and Research, DSI Building, 5, Engineering Drive 1, Singapore 117608, Singapore


    During the plastic packaging process, mold flash is usually formed on a heat sink. In order to keep efficient heat transfer from the integrated circuit device to the exterior environment, the mold flash must be removed from the heat sink surface. In this paper, we demonstrate that a Nd:YAG laser deflashing is only available to remove thin flash of a few micrometers from heat sinks and cannot remove thick flash without damage to the heat sink, both from experimental and numerical analysis. Based on optical and ther...

    $25.00

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


    Authors:
    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...

    $25.00

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


    Authors:
    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...

    $25.00

  • JLA Vol:15 Iss:1 (Deposition of WC/Ni clad layers with a pulsed Nd:YAG laser)


    Authors:
    M. Brandt
    Industrial Research Institute Swinburne, Swinburne University of Technology, Melbourne Vic 3122, Australia

    S. W. Huang
    M. Samandi
    Department of Materials Engineering, Surface Engineering Research Centre (SERC), University of Wollongong, NSW 2522, Australia


    A series of experiments was performed to investigate the production of WC/Ni clad layers on H13 tool steel using a pulsed Nd:YAG laser and optical fibers. The effects of laser parameters, such as laser pulse energy and pulse frequency as well as material parameters such as powder composition and shape on the clad layer geometry and microstructure, were investigated. The microstru...

    $25.00

  • JLA Vol:19 Iss:1 (Procedure for the computation of hazards from diffusely scattering surfaces under the Z136.1-2000 American National Standard for Safe Use of Lasers)


    Authors:
    Robert J. Thomas
    Benjamin A. Rockwell
    Air Force Research Laboratory, Brooks AFB, Texas 78235-5128

    Wesley J. Marshall
    USACHPPM, Aberdeen Proving Ground, Maryland 21010-5403

    Robert C. Aldrich
    Mary F. Gorschboth
    Sheldon A. Zimmerman
    Dahlgren Division, Naval Surface Warfare Center, Dahlgren, Virginia 22448-5100

    R. James Rockwell
    Rockwell Laser Industries, Cincinnati, Ohio 45243


    The current national consensus standard for laser safety in the United States is the American National Standard for Safe Use of Lasers (ANSI Z136.1). The most recent standard, Z136.1-2000, incorporates ...

    $25.00

  • JLA Vol:23 Iss:1 (Tolerances of joint gaps in Nd:YAG laser welded Ti-6Al-4V alloy with the addition of filler wire)


    Authors:
    X. Cao
    Aerospace Manufacturing Technology Centre, Institute for Aerospace Research, National Research Council Canada, 5145 Decelles Ave., Montreal, Quebec H3T 2B2, Canada

    G. Debaecker
    Ecole Centrale de Nantes, 1 Rue de la Noe´, B.P. 92101, 44321 Nantes Cedex 3, France

    E. Poirier
    Aerospace Manufacturing Technology Centre, Institute for Aerospace Research, National Research Council Canada, 5145 Decelles Ave., Montreal, Quebec H3T 2B2, Canada

    S. Marya
    Ecole Centrale de Nantes, 1 Rue de la Noe´, B.P. 92101, 44321 Nantes Cedex 3, France

    J. Cuddy
    A. Birur
    Standard Aero Limited, 33 Allen D...

    $25.00

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