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  • JLA Vol:16 Iss:2 (Laser short pulse heating of copper: Thermo–elasto–plastic analysis)


    Authors:
    A. F. M. Arif
    B. S. Yilbas
    ME Department, KFUPM. Dhahran, Saudi Arabia


    Laser short pulse heating of metallic substrates results in excessive electron temperatures in the surface vicinity. This gives rise to nonequilibrium energy transport in the region irradiated by a laser beam. Moreover, the thermomechanical coupling effect should be incorporated into the energy transport equation as lattice site temperature increases. In the present study, laser short pulse heating of copper is considered. The electron kinetic theory approach is employed to model the nonequilibrium heating process while thermomechanical coupling is introduced in the energy transport equation t...

    $25.00

  • JLA Vol:20 Iss:3 (Diode-pumped solid state laser light sources for confocal laser scanning fluorescence microscopy)


    Authors:
    Mårten Stjernstro¨m
    Department of Applied Physics, Royal Institute of Technology, SE-106 91 Stockholm, Sweden and Department of Chemistry, Royal Institute of Technology, SE-100 44 Stockholm, Sweden

    Fredrik Laurell
    Hjalmar Brismar
    Department of Applied Physics, Royal Institute of Technology, SE-106 91 Stockholm, Sweden


    Diode-pumped solid-state lasers (DPSSLs) have been integrated as light sources in confocal laser scanning microscopy (CLSM). The standard argon ion laser at 488 nm is compared with a DPSSL operating at 473 nm in terms of noise and CLSM image characteristics. The equally high fluorescence image quality togeth...

    $25.00

  • JLA Vol:24 Iss:3 (Investigation of the effects of basic laser material interaction parameters in laser welding)


    Authors:
    W. J. Suder
    S. W. Williams
    Welding Engineering and Laser Processing Centre, Cranfield University, MK43 0AL, United Kingdom


    The depth of penetration achieved in continuous wave (CW) laser welding results from a balance of many complicated phenomena, which are linked with the characteristics of the heat source. In this work, the laser welding process has been investigated in terms of basic laser material interaction parameters: power density and interaction time. It has been shown that these two parameters are insufficient to characterize the laser welding process. Thus, a third parameter, specific point energy, has been introduced, which along with the power densi...

    $25.00

  • JLA Vol:6 Iss:4 (Effective laser applications in high school physics)


    Authors:
    Jeff Sweet
    North Salinas High School Salinas, CA 93906, U.S.A.


    Laser light is an instant attention‐getter in the classroom; thus any activity which uses the laser as an instructional tool is sure to enhance student motivation. This paper discusses two demonstrations and one experiment involving laser applications that the author has found to be particularly beneficial in terms of (1) instructional effectiveness and (2) arousing the interest of high school physics students. Brief descriptions follow. Refraction through lenses can be nicely illustrated by splitting laser light into several parallel beams and directing them through a fish tank filled with a scatt...

    $25.00

  • JLA Vol:14 Iss:3 (Assessment of laser Doppler perfusion imager&rsquo;s <em>in vivo</em> reliability: Can it be used for a prospective analysis?)


    Authors:
    Antonella Caselli
    Array

    Damanpreet Singh Bedi
    Colleen O’Connor
    Chirag Shah
    Aristidis Veves
    Joslin–Beth Israel Deaconess Foot Center, Department of Surgery, and Microcirculation Laboratory, Beth Israel–Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts


    The aim of this study was to assess the reliability of the laser Doppler perfusion imager (Lisca PIM 1.0; Lisca development, Linkoping, Sweden) for longitudinal analysis. We measured the skin blood flow under a biological zero condition at the forearm level in 84 patients enrolled in a 12 week prospective interventional trial. Sin...

    $25.00

  • JLA Vol:18 Iss:4 (Aluminum alloy welding by using a high power direct diode laser)


    Authors:
    N. Abe
    M. Tsukamoto
    Joining and Welding Research Institute, Osaka University, 11-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan

    K. Maeda
    K. Namba
    Research and Development Center, Sumitomo Light Metal Industries, Ltd., 3-1-12 Chitose, Minato-ku, Nagoya 455-8670, Japan

    J. Morimoto
    School of Science and Engineering, Kinki University, 3-4-1, Kowakae, Higashiosaka, Osaka 577-8502, Japan


    Aluminum alloys are the focus of increasing attention from the automobile industry because of their light weight, high formability, and easy recyclability. In this report, a 4 kW high power direct diode laser was used to exami...

    $25.00

  • JLA Vol:7 Iss:1 (Safe laser system design for production)


    Authors:
    Ami Kestenbaum
    Richard J. Coyle
    Patrick P. Solan
    AT&T Bell Laboratories Engineering Research Center, Princeton, NJ 08542&hyphen;0900, U.S.A.


    The majority of industrial lasers used in manufacturing are Class IV lasers. Engineering and administrative control measures appropriate to that class of lasers must be enforced to ensure their safe use in production environments, i.e. they should be designed into Class 1 laser systems. In addition, several other design characteristics unique to industrial applications are normally incorporated into these Class I systems, such as interlocked enclosures, process mon...

    $25.00

  • JLA Vol:17 Iss:1 (Fracture control of unsupported ceramics during laser machining using a simultaneous prescore)


    Authors:
    A. E. Segall
    G. Cai
    R. Akarapu
    A. Romasco
    Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802

    B. Q. Li
    Department of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164


    While lasers offer many advantages when machining ceramics, costly premature fractures and related damage is the tradeoff often faced by manufacturers. This tradeoff is especially apparent for higher-speed machining of complex shapes where traditional “nail-bed” supports are not always practical. To help overcome these problems, re...

    $25.00

  • JLA Vol:21 Iss:3 (Laser welding of galvanized DP980 steel assisted by the GTAW preheating in a gap-free lap joint configuration)


    Authors:
    Shanglu Yang
    Radovan Kovacevic
    Center for Advanced Manufacturing, Southern Methodist University, Dallas, Texas, USA 75205


    With the increasing need for reducing the vehicle’s weight, improving fuel efficiency and safety, as well as the corrosion resistance, more and more galvanized high-strength steels have been used in the automotive industry. However, the successful laser welding of galvanized steels in gap-free lap joint configuration is still a big challenge. The high-pressurized zinc vapor is readily developed at the interface of the two metal sheets due to the lower boiling point of zinc (around 906 °C) than the melting point of steel (over 13...

    $25.00

  • JLA Vol:24 Iss:5 (Development of new processes for welding of thermal Al&ndash;Cu solar absorbers using diode lasers)


    Authors:
    Andre Springer
    Peter Kallage
    Michael Hustedt
    Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany

    Stephan Barcikowski
    University of Duisburg-Essen, Technical Chemistry I, Universitaetsstr. 5–7, 45141 Essen, Germany

    Volker Wesling
    Heinz Haferkamp
    Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany


    Flat-plate solar collectors are favorable devices to generate heat from the energy of the Sun. The central part of a collector, the solar absorber, is a front-coated aluminum sheet with a copper tube fixed on the back side in order to transport heated liquid. ...

    $25.00

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