• 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...

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  • JLA Vol:24 Iss:5 (A comparative study of cut front profiles and absorptivity behavior for disk and CO<sub>2</sub> laser beam inert gas fusion cutting)


    Authors:
    Leonardo Daniele Scintilla
    Luigi Tricarico
    Dipartimento di Meccanica, Matematica e Management (DMMM), Politecnico di Bari, Viale Japigia, 182–70126 Bari, Italy

    Achim Mahrle
    Institute of Manufacturing Technology, Technische Universita¨t Dresden, 01062 Dresden, Germany and Fraunhofer IWS Dresden, Winterbergstraße 28, 01277 Dresden, Germany

    Andreas Wetzig
    Fraunhofer IWS Dresden, Winterbergstraße 28, 01277 Dresden, Germany

    Eckhard Beyer
    Institute of Manufacturing Technology, Technische Universita¨t Dresden, 01062 Dresden, Germany and Fraunhofer IWS Dresden, Winterbergstraße 28, 01277 Dres...

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  • 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...

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  • 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...

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  • 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...

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  • JLA Vol:21 Iss:3 (Infrared observations and finite element modeling of a laser transmission welding process)


    Authors:
    L. S. Mayboudi
    A. M. Birk
    G. Zak
    Mechanical and Materials Engineering, Queen’s University, Kingston, Ontario K7L 3N6, Canada

    P. J. Bates
    Chemistry and Chemical Engineering, Royal Military College, Kingston, Ontario K7K 7B4, Canada


    Laser transmission welding (LTW), a technique to join thermoplastic components, involves a laser beam passing through a laser-transmitting part and then being absorbed by the laser-absorbing part at the weld interface. To form a strong bond, it is important that the weld interface be exposed to sufficient heat to melt the polymer without degrading it. A lap-joint geometry was investigated and the...

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  • JLA Vol:8 Iss:1 (Laser polarimeters: Overview of recent developments, design and applications)


    Authors:
    Vi´ctor Fajer Avila
    Center for the Development of Scientific Equipment and Instruments, Ministry of Science Techonology and Environment, Havana, Cuba


    Research carried out in Cuba has led to the design and construction of automatic polarimeters that use the He&hyphen;Ne laser as a luminous source and work on a magnetooptic principle of measurement. Physical and chemical investigations including the use of the He&hyphen;Ne laser as a light source are discussed. The principle of measurement for the design and construction of polarimeters, resulting in three different types of these instruments, is described. Finally, applications for magnetooptic polarimetry are described,...

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  • JLA Vol:3 Iss:1 (Laser Welding Copper and Copper Alloys)


    Authors:
    Kaoru Hashimoto
    Takehiko Sato
    Koichi Niwa
    Fujitsu Laboratories Ltd., 10&hyphen;1, Morinosato&hyphen;Wakamiya, Atsugi 243&hyphen;01, Japan


    We have developed a laser hermetic sealing technique that combines nickel plating with laser welding for copper and copper alloy bellows for general purpose large&hyphen;scale computers. Laser welding of copper has been difficult because of copper's high thermal conductivity and reflectivity. However, laser welding nickel&hyphen;plated copper results in deep penetration. To avoid corrosion induced at the dissimilar metal contact between nickel and copper, the nickel&hyphen;plated copper was heat&hyphen;treated bef...

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  • JLA Vol:15 Iss:2 (Plasma assisted laser surface alloying)


    Authors:
    M. H. McCay
    C. M. Sharp
    J. A. Hopkins
    The Center for Laser Applications, The University of Tennessee Space Institute, Tullahoma, Tennessee 37388

    B. Szapiro
    The Department of Physics, University of the South, Sewanee, Tennessee

    T. D. McCay
    The Center for Laser Applications, The University of Tennessee Space Institute, Tullahoma, Tennessee 37388


    The combination of plasma arc with a Nd:YAG laser during surface alloying produces a synergistic effect which significantly increases the depth of the melt pool beyond that expected by a summation of the individual depths. Incremental increases in laser power produce ...

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