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


    Authors:
    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 ...

    $25.00

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


    Authors:
    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...

    $25.00

  • JLA Vol:25 Iss:3 (The influence of position in overlap joints of Mg and Al alloys on microstructure and hardness of laser welds)


    Authors:
    S. Bannour
    Unite´ de Thermique et Thermodynamique des Proce´de´s Industriels, Ecole Nationale d'Inge´nieurs de Monastir, Avenue Ibn Jazzar, 5019 Monastir, Tunisia and Institut de Me´canique de Marseille, Laboratoire IUSTI, UMR CNRS 6595, Universite´ de la Me´diterrane´e—Aix-Marseille Universite´, Technopoˆle de Chaˆteau- Gombert, 60 rue Joliot Curie, 13453 Marseille Cedex 13, France

    K. Abderrazak
    Unite´ de Thermique et Thermodynamique des Proce´de´s Industriels, Ecole Nationale d'Inge´nieurs de Monastir, Avenue Ibn Jazzar, 5019 Monastir, Tunisia

    S. Mattei

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


    Authors:
    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...

    $25.00

  • JLA Vol:18 Iss:2 (Laser helical drilling of silicon wafers with ns to fs pulses: Scanning electron microscopy and transmission electron microscopy characterization of drilled through-holes)


    Authors:
    J. Kaspar
    A. Luft
    Fraunhofer Institut fu¨r Werkstoff- und Strahltechnik, Winterbergstr.28, D-01277 Dresden, Germany

    S. Nolte
    M. Will
    Institut fu¨r Angewandte Physik, Friedrich-Schiller-Universita¨t, Max-Wien-Platz 1, D-07743 Jena, Germany

    E. Beyer
    Fraunhofer Institut fu¨r Werkstoff- und Strahltechnik, Winterbergstr.28, D-01277 Dresden, Germany


    Electron microscopic methods (scanning electron microscopy and transmission electron microscopy) are used to characterize the precision and quality of microthrough-holes produced in 0.4 mm-thick silicon wafers by applying the pulsed laser helical drill...

    $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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