• JLA Vol:20 Iss:3 (Investigation of femtosecond laser induced thermal ablation of polyethylene)


    Authors:
    Andrew J. Lee
    Judith M. Dawes
    Michael J. Withford
    Centre of Ultrahigh-bandwidth Devices for Optical Systems (CUDOS) and MQPhotonics Research Centre, Department of Physics, Macquarie University, 2109 NSW, Australia


    We present a novel method for profiling high aspect ratio and undercut laser drilled holes using sacrificial layers. This profiling method is used to compare and contrast laser ablation of polyethylene films under exposure to ultraviolet (266 nm) and near-infrared (800 nm) radiation from an ultrafast, femtosecond laser. We find that ultraviolet femtosecond pulsed laser processing of this polymer exhibits similar characteristics to...

    $25.00

  • 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:24 Iss:2 (Temperature measurement of laser heated metals in highly oxidizing environment using 2D single-band and spectral pyrometry)


    Authors:
    Maryse Muller
    Remy Fabbro
    PIMM Laboratory (Arts et Me´tiers ParisTech—CNRS), 151 Bd.de l’Hoˆpital, 75013 Paris, France

    Hazem El-Rabii
    Institut Prime, CNRS-ENSMA-Universite´ de Poitiers, 1 Ave. Cle´ment Ader, BP 40109, 86961 Futuroscope Chasseneuil Cedex, France

    Koji Hirano
    Nippon Steel Corporation, Marunouchi Park Building, 2-6-1 Marunouchi, Chiyoda Ward, Tokyo 100-8071, Japan


    Calibration and validation of two temperature measurement techniques both using optical pyrometry, usable in the framework of the study of the heated metals in highly oxidizing environments and more generally dur...

    $25.00

  • JLA Vol:6 Iss:3 (Laser express: Putting together a laser‐based road show)


    Authors:
    Steven S. Lympany
    Laser & Electro‐Optics Technology, Central Carolina Community College, Lillington, NC 27546, U.S.A.


    Laser technology has progressed to the point that most elementary through high school students are familiar with one or more laser applications. However, many of these students have not had the opportunity to witness a laser in acton where they can touch it and see it directly. In addition, most students are unaware of the career possibilities the field of laser technology has to offer. This paper presents the specifics of a successful laser‐based program that has been offered to K‐12 students and teachers in North Carolina over the la...

    $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:8 Iss:5 (A guide to developing a laser standard operating procedure)


    Authors:
    Ken Barat
    Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A.


    The ANSI Z 136.1 standard requires a standard operating procedure (SOP), however, it does not recommend or suggest a format for the SOP. The goal of this article is to outline, explain and suggest an SOP format that could be applied by a laser safety officer to a varied number of situations and laser uses.

    $25.00

  • JLA Vol:2 Iss:1 (The Clinical Status of Low Energy Laser Therapy in 1989)


    Authors:
    Jeffrey R. Basford
    Department of Physical Medicine and Rehabilitation, Mayo Clinic and Foundation, Rochester, MN, U.S.A. 55902


    Low energy laser therapy has gained varying acceptance as a treatment for a broad range of soft tissue, musculoskeletal and neurological conditions. A controversial, but surprisingly large body of research with cell cultures suggests that laser irradiation can nondestructively alter cellular processes. Unfortunately, animal and human studies are often contradictory and difficult to evaluate due to differing study designs. As a result, the clinical effectiveness of low energy laser therapy remains debatable. Nevertheless, the findings are intriguing a...

    $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

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