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  • JLA Vol:25 Iss:3 (Laser processing of nickel–aluminum bronze for improved surface corrosion properties)


    Authors:
    R. Cottam
    T. Barry
    Industrial Laser Applications Laboratory, IRIS, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Victoria 3122, Australia and Defence Materials Technology Centre, Victoria 3122, Australia

    D. McDonald
    Department of Mechanical Engineering, The University of Melbourne, Victoria 3010, Australia and Defence Materials Technology Centre, Victoria 3122, Australia

    H. Li
    Faculty of Engineering, University of Wollongong, New South Wales 2522, Australia and Defence Materials Technology Centre, Victoria 3122, Australia

    D. Edwards
    A. Majumdar
    Defence Science and T...

    $25.00

  • JLA Vol:16 Iss:4 (Laser assisted cleaning of oxide films on SUS409 stainless steel)


    Authors:
    H. Guo
    Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802

    R. Martukanitz
    Applied Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802

    T. DebRoy
    Department of Materials Science and Engineering, The Pennsylvania State Univeristy, University Park, Pennsylvania 16802


    Laser assisted cleaning of oxide films on SUS409 stainless steel plates was studied both experimentally and theoretically. The highly oxidized surfaces with oxide scales of about 25 μm thickness were irradiated with Q-switched pulsed Nd:yttritium–aluminu...

    $25.00

  • JLA Vol:21 Iss:2 (Partial growth of crack in laser scribing of glass)


    Authors:
    Koji Yamamoto
    Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565–0871, Japan

    Noboru Hasaka
    Hideki Morita
    Mitsuboshi Diamond Industrial Co., Ltd., 1-4-37 Minami-kaneden, Suita, Osaka 564–0044, Japan

    Etsuji Ohmura
    Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565–0871, Japan


    The scribing of glass by a CO2 laser is much more effective compared to the conventional mechanical technology in use because the strength of the cut glass is improved since microcracks and particles along the cut edge are lessened. However, the crack depth of ...

    $25.00

  • JLA Vol:23 Iss:2 (Experimental investigation of laser shock peening using femtosecond laser pulses)


    Authors:
    Dongkyun Lee
    Elijah Kannatey-Asibu
    Department of Mechanical Engineering, The University of Michigan, Ann Arbor, Michigan 48105-2125


    In this study, the feasibility of laser shock peening using ultrafast laser pulses was experimentally investigated. A top coating of zinc with a water confining layer was applied in the investigation. The zinc coating was used for the thermoprotective effect. A high numerical aperture (NA≅0.5) aspheric lens was used to minimize the optical breakdown of water. Microhardness measurements were made on the top surface of the shock peened specimen and compared with the original material hardness. The results provide useful insight on...

    $25.00

  • JLA Vol:7 Iss:3 (Laser beam surveying, refractive index measurements and the making of a 360° reflection hologram)


    Authors:
    David Foster
    Notre Dame High School, 596 South Second St., San Jose, California 95112, U.S.A.


    Triangulation measurements, using a laser to find the height of a room and of buildings, will be described first. This will be followed by triangulation and laser beam divergence measurements for range finding. The use of a hollow prism to hold liquids, whose refractive indicies are to be found, will then be described. The final topic will describe how a 360° reflection hologram was made at Notre Dame High School, utilizing three lasers and beam spreaders and four lasers and beam spreaders. The 360° hologram, made by a student, will be available for viewing.

    $25.00

  • JLA Vol:15 Iss:2 (Antigalling and low friction properties of a laser processed Co-based material)


    Authors:
    D. H. E. Persson
    Duroc AB, Umeå, Sweden

    S. Jacobson
    S. Hogmark
    The Tribomaterials Group at Ångstro¨m Laboratory, Uppsala University, Sweden


    The antigalling and low friction properties of a CO2-laser processed Co-based material (Stellite 21) was investigated under high-load sliding conditions. Dry sliding tests were carried out at both room temperature and at 250 °C. The tests were performed by sliding two identical specimens against each other in a dedicated test. A low and stable friction coefficient at a level of about 0.20, and relatively independent on load and sliding speed, was obtained after a short runn...

    $25.00

  • JLA Vol:19 Iss:2 (Interaction of a focused laser beam and a coaxial powder jet in laser surface processing)


    Authors:
    O. O. Diniz Neto
    A. M. Alcalde
    Instituto de Fi´sica, Universidade Federal de Uberlaˆndia, Caixa Postal 593, CEP 38400-902, Uberlaˆndia MG, Brazil

    R. Vilar
    Instituto Superior Te´cnico and ICEMS, Av. Rovisco Pais, 1096-001 Lisboa, Portugal


    Laser cladding, laser alloying, and laser free-form manufacturing are promising techniques where a laser beam is frequently used in conjunction with a coaxial powder jet for surface treating or rapid manufacturing. In the present work, a computational model was developed and used to simulate several experimental setups in order to optimize the processing conditions. More specifically, t...

    $25.00

  • JLA Vol:9 Iss:6 (Amendments to the Center for Devices and Radiological Health Federal Performance Standard for laser products)


    Authors:
    Jerome E. Dennis
    Center for Devices and Radiological Health, Food and Drug Administration, Rockville, MD, U.S.A.


    Federal law requires that all laser products that are imported into or introduced into commerce in the United States comply with the performance standard published in the Code of Federal Regulations (CRF), Title 21, Parts 1040.10 and 1040.11, administered by the Center for Devices and Radiological Health (CDRH), US Food and Drug Administration. Although it contains somewhat different requirements for hazard classification, engineering controls and labeling, the ANSI Z136.1 standard defers to the CDRH standard. The CDRH standard became effective in August, 1976 and ...

    $25.00

  • JLA Vol:3 Iss:2 (Precision Limits of the Estimation of the Parameters of Fo¨rster Models of Fluorescence Waveforms)


    Authors:
    L. Jonathan Dowell
    Los Alamos National Laboratory, Los Alamos, NM 87545


    The author examined the precision of maximum‐likelihood‐derived, nonlinear least‐squared‐error algorithms that are suitable for laboratory implementation and that estimate the parameters of Fo¨rster models of fluorescence. The estimation precision for these parameters is limited by inherent noise in the fluorescence‐waveform measurement. This paper examines the Fo¨rster model and its recent applications and discusses parameter estimations for models of energy transfer by different wavefunction interactions. It presents the results of Monte Carlo simulation studi...

    $25.00

  • JLA Vol:26 Iss:1 (Two-dimensional simulation of laser ablation with 235 nanosecond pulses)


    Authors:
    Sousan Ghalamdaran
    Iranian National Centre for Laser Science and Technology (INLC), PO Box 14665-576 Tehran, Iran and Department of Physics, Amir Kabir University of Technology, PO Box 15875-4413 Tehran, Iran

    Parviz Parvin
    Department of Physics, Amir Kabir University of Technology, PO Box 15875-4413 Tehran, Iran

    Mohamad Javad Torkamany
    Jamshid Sabbagh Zadeh
    Iranian National Centre for Laser Science and Technology (INLC), PO Box 14665-576 Tehran, Iran


    A two-dimensional thermal model of nanosecond pulsed laser ablation is developed to describe the physical processes, the plasma absorption, the crater profile, and the temp...

    $25.00

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