• 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:26 Iss:1 (Evolution of nano-ripples on stainless steel irradiated by picosecond laser pulses)


    Authors:
    Bin Liu
    Wenjun Wang
    Gedong Jiang
    Xuesong Mei
    Kedian Wang
    Jiuhong Wang
    Zibao Wang
    State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xi'an 710054, China


    The characteristics of laser-induced periodic surface structures are investigated after laser irradiation with a pulse duration (10 ps) under a certain laser fluence (0.27 J/cm2) and pulse number (N = 50–2000). In the experiments, at the lowest number of pulses, ultrafine ripples are observed with sub-200-nm spatial periods and an orientation parallel to laser polarization ...

    $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: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...

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  • 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: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

  • JLA Vol:7 Iss:2 (Understanding laser hazard evaluation)


    Authors:
    Wesley J. Marshall
    U.S. Army Center for Health Promotion and Preventive Medicine (Provisional), Aberdeen Proving Ground, MD 21010‐5422, U.S.A.


    The current 1993 version of the ANSI Z136.1 standard for the safe use of lasers provides maximum permissible exposures which more closely match available biological injury data. Interpreting the standard can be more difficult at times than with previous versions. By keeping the biological injury mechanism in mind, the reasoning behind the multitude of rules contained in the standard are more understandable.

    $25.00

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