• JLA Vol:14 Iss:1 (Cutting of slate tiles by CO<sub>2</sub> laser)


    Authors:
    M. Boutinguiza
    F. Lusquin˜os
    J. Pou
    R. Soto
    F. Quintero
    M. Pe´rez-Amor
    Departamento Fı´sica Aplicada Universidade de Vigo, Lagoas Marcosende 9, E-36200 VIGO, Spain

    K. Watkins
    Laser Engineering Group, Department of Engineering, The University of Liverpool, Liverpool L69 3GH, United Kingdom


    Slate is a natural stone which has the characteristic that shows a well-developed defoliation plane, allowing to easily split it in plates parallel to that plane which are particularly used as tiles for roof building. At present, the manufacturing of slate is mostly manual, bein...

    $25.00

  • JLA Vol:18 Iss:2 (Investigation of the effects of nonconventional beam geometries in laser surface treatment of ceramics: Theoretical analysis)


    Authors:
    D. Triantafyllidis
    Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M60 1QD, United Kingdom and Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 IQD, United Kingdom

    L. Li
    Laser Processing Research Center, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M60 1QD, United Kingdom

    F. H. Stott
    Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M60 1QD, United Kingdom


    Laser surface treatment of ceramics by melting and re...

    $25.00

  • JLA Vol:16 Iss:2 (Investigation of weld cracking in Nd:yttrium&ndash;aluminum&ndash;garnet keyhole spot welding of materials used in optoelectronic packaging)


    Authors:
    Geoff J. Shannon
    Unitek Miyachi Corporation, 1820 S. Myrtle Avenue, Monrovia, California 91017

    Bernard Q. Li
    Honeywell VCSEL Optical Division, Minnesota


    The welding of a problematic optical device weld joint between dissimilar materials is investigated in depth. The original material combination of cold rolled steel 1010 with 6 μm of gold coating and 304 L produced consistent weld cracking. The CRS1010 material was fixed, however the other component was open to material selection. The materials tested were 304 L stainless steel, kovar, invar, and Carpenter high permeability 49 alloy. The effect of these different materials, laser pulse parameters, lev...

    $25.00

  • JLA Vol:20 Iss:4 (Thermal stress analysis on laser scribing of glass)


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

    Noboru Hasaka
    Hideki Morita
    Mitsuboshi Diamond Industrial Co., Ltd., 2-12-12 Minami-Kaneden, Suita, Osaka, Japan

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


    In the laser scribing of glass a thermal stress is introduced into a glass substrate by means of a CO2 laser irradiation. The glass substrate is then rapidly cooled down by water jet immediately after the irradiation. For the purpose of theoretical clarification of the factors ruling the scribable condit...

    $25.00

  • JLA Vol:25 Iss:5 (Investigation into the effects of process parameters on bending angle in the laser bending of tailor machined blanks based on a statistical analysis)


    Authors:
    Mehdi Safari
    Mahmoud Farzin
    Abbas Ghaei
    Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran


    In this paper, the effects of process parameters on bending angle in laser bending of tailor machined blanks are investigated experimentally. The Taguchi experimental design method is employed to study various parameters, which significantly affect the bending angle in the laser bending of tailor machined blanks. The start point of scan path, irradiating method, laser output power, beam diameter, and number of radiation passes are considered in the evaluations. A L18(21×34) Ta...

    $25.00

  • JLA Vol:23 Iss:4 (Thermal diffusivity measurement of silver nanofluid by thermal lens technique)


    Authors:
    Reza Zamiri
    Department of Physics, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

    B. Z. Azmi
    Department of Physics,Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia and Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia

    E. Shahriari
    Kazim Naghavi
    E. Saion
    Zahid Rizwan
    M. S. Husin
    Department of Physics, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia


    The thermal lens technique was utilized in silver nanofluid containing silver nanopartic...

    $25.00

  • JLA Vol:6 Iss:1 (Amending the CDRH performance standard for laser products)


    Authors:
    Jerome E. Dennis
    Office of Compliance and Surveillance Center for Devices and Radiological Heath, US Food and Drug Administration, Silver Springs, MD, U.S.A.


    The most recent amendments to the Federal performance standard for laser products became effective in 1985 and 1986. At this time, the Center for Devices and Radiological Health (CDRH) is making public its intention to amend the standard again and is inviting suggestions and comments. The amendments that are now under consideration are based upon advances in the sciences of photobiology and hazard evaluation. They are also intended to harmonize with developments in international standards for similar products, and to cla...

    $25.00

  • JLA Vol:14 Iss:4 (High-energy femtosecond pulsed laser micromachining of thin film deposited silicon in self-focused air medium)


    Authors:
    Yuanyuan Dong
    Pal Molian
    Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011

    Christian Zorman
    Mehran Mehregany
    Department of Electrical Engineering and Computer Science, Case Western Reserve University, Cleveland, Ohio 44106


    The ultrashort pulsed laser ablation of silicon wafers deposited with 1 μm thin film of SiC was performed in air medium using a 1 mJ, 120 fs, 800 nm Ti:sapphire laser, the objective being to determine the self-focusing capability of air to produce nanostructures. The effects of pulse energy, the number of pulses, pulse repetition rate and x–y translation speed on t...

    $25.00

  • JLA Vol:18 Iss:4 (Threshold powers and delays for igniting propane and butane-air mixtures by cw laser-heated small particles)


    Authors:
    Thomas H. Dubaniewicz
    National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, 626 Cochrans Mill Road, Pittsburgh, Pennsylvania 15236


    The National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory conducted a study of laser safety in potentially flammable environments. Researchers measured threshold igniting powers as a function of beam diameter for butane and propane-air mixtures by laser-heating targets placed on optical fiber tips using a 1064 nm laser. The minimum igniting powers for propane-air and butane-air were about 250 and 300 mW, respectively. Threshold igniting powers for propane-air were approxima...

    $25.00

  • JLA Vol:1 Iss:4 (Laser Accidents: Are They All Reported and What Can Be Learned from Them?)


    Authors:
    R. James Rockwell
    Rockwell Laser Industries, Cincinnati, Ohio


    $25.00

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