• JLA Vol:2 Iss:1 (On Laser Vibrometry of Rotating Targets: Effects of Torsional and In‐Plane Vibration)


    Authors:
    S. J. Rothberg
    J. R. Baker
    N. A. Halliwell
    ISVR, University of Southampton, Highfield, Southampton S09 5NH, England


    Vibration measurements on rotating surfaces are often referred to in the commercial literature as a major application of laser Doppler vibration transducers. This paper examines such use of these instruments and shows how the presence of a velocity component due to the rotation itself leads to spurious measurement dependence on both torsional vibration and motion perpendicular to the line of incidence of the laser beam. In addition, the scale of this dependence increases with both rotation speed and perpendicular distance between the l...

    $25.00

  • JLA Vol:15 Iss:1 (Microstructure and corrosion behavior of high power diode laser deposited Inconel 625 coatings)


    Authors:
    J. Tuominen
    Laser Application Laboratory, Tampere University of Technology, FIN-33101 Tampere, Finland

    P. Vuoristo
    T. Ma¨ntyla¨
    Institute of Materials Science, Tampere University of Technology, FIN-33101 Tampere, Finland

    J. Latokartano
    J. Vihinen
    Laser Application Laboratory, Tampere University of Technology, FIN-33101 Tampere, Finland

    P. H. Andersson
    Institute of Production Engineering, Tampere University of Technology, FIN-33101 Tampere, Finland


    A series of experiments were performed to investigate the one-step laser cladding of Inconel 625 powder, injected off-axially onto m...

    $25.00

  • JLA Vol:19 Iss:2 (Welding of titanium and other refractory metals with a free pulse shaping laser)


    Authors:
    Karsten Richter
    Lasag AG, Switzerland

    Uwe Reisgen
    Wilfried Behr
    Forschungszentrum Ju¨lich GmbH, Germany

    Ronald Holtz
    Lasag AG, Switzerland


    Refractory metals are used as construction materials for specific applications. Amongst the refractory metals, titanium has a special status due to its multi-faceted property profile and its comparatively low price. Titanium materials have outstanding properties, such as excellent resistance to corrosion and very high strength at low densities, which lead to their preferred use in chemical engineering and as a structural material in lightweight construction. Due to the high affin...

    $25.00

  • JLA Vol:24 Iss:4 (Cellular reactions toward nanostructured silicon surfaces created by laser ablation)


    Authors:
    K. Wallat
    Institute of Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstr. 5-7, 45117 Essen, Germany

    D. Do¨rr
    R. Le Harzic
    F. Stracke
    D. Sauer
    Fraunhofer Institute for Biomedical Engineering (IBMT) and Chair for Molecular and Cellular Biotechnology (University of Saarbruecken), Ensheimer Str. 48, 66386 St. Ingbert, Germany

    M. Neumeier
    A. Kovtun
    Institute of Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Universitaetsstr. 5-7, 45117 Essen, Germany

    H. Zimm...

    $25.00

  • JLA Vol:4 Iss:3 (Recommendations for Safe and Appropriate Use of Lasers in Dentistry in Face of Rising Concerns)


    Authors:
    Leo J. Miserendino
    Elliot Abt
    David Harris
    Harvey Wigdor
    The Chicago Dental Laser Institute


    $25.00

  • JLA Vol:17 Iss:4 (Faster and damage-reduced laser cutting of thick ceramics using a simultaneous prescore approach)


    Authors:
    V. Pereles-Santiago
    M. Washington
    P. Brugan
    G. Cai
    R. Akarapu
    S. Pulford
    A. E. Segall
    The Pennsylvania State University, University Park, Pennsylvania 16802


    Laser machining of structural ceramics is increasingly gaining acceptance as an alternative to traditional machining methods. However, despite the great promise of lasers for a variety of cutting and drilling procedures, premature fractures and prohibitively low cutting speeds are still among the greatest obstacles encountered, particularly when thick cross sections are involved. While many factors contribute to the fractures encountered during ...

    $25.00

  • JLA Vol:22 Iss:2 (Keyhole behavior in deep penetration CO<sub>2</sub> laser welding)


    Authors:
    Hiroshi Honda
    Susumu Tsukamoto
    Isao Kawaguchi
    Goro Arakane
    Structural Metals Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan


    A slender keyhole formed by deep penetration laser welding fluctuates violently and is apt to form porosity. To reveal the keyhole depth behavior, the authors observed the keyhole images simultaneously by using a microfocus x-ray transmission imaging system and plasma plume images in deep penetration CO2 laser welding at various welding speeds. Plasma light emission was also measured by using photodiodes. The upper part of the keyhole was found to fluctuat...

    $25.00

  • JLA Vol:26 Iss:1 (Performance enhancement of aluminum infrared laser welding by preconditioning with nanosecond laser pulses)


    Authors:
    Philipp von Witzendorff
    Anas Moalem
    Uwe Stute
    Ludger Overmeyer
    Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany


    We condition the welding zone of the aluminum surface with nanosecond laser pulses prior to welding with infrared laser radiation to increase the process efficiency and weld quality. The high reflectivity of aluminum for infrared laser radiation (95% at 1064 nm) leads to poor process efficiency of aluminum laser welding processes. To increase the workpiece's absorptivity, the welding zone is conditioned with nanosecond laser pulses at a wavelength of 532 nm. The samples are nonalloy, 0.5 mm thick alum...

    $25.00

  • JLA Vol:23 Iss:1 (Review of laser microscale processing of silicon carbide)


    Authors:
    B. Pecholt
    S. Gupta
    P. Molian
    Department of Mechanical Engineering, Laboratory for Lasers, MEMS and Nanotechnology, Iowa State University, Ames, Iowa 50011


    A review of various laser techniques for microscale processing of SiC for microelectronics and microelectromechanical-system applications is presented. SiC is an excellent material for harsh environments due to its outstanding mechanical, thermal, and chemical properties. However, its extreme thermodynamic stability and inert properties created difficulties in conventional microfabrication methods which provided an opportunity for the exploration of laser processing as an alternative. Many aspects...

    $25.00

  • JLA Vol:7 Iss:3 (Characterization of chromium bearing surface alloys produced by laser alloying on low carbon steel substrates)


    Authors:
    G. L. Goswami
    Dilip Kumar
    A. L. Pappachan
    A. K. Grover
    K. Sridhar
    Array


    High&hyphen;chromium ferritic alloys were produced on mild steel substrates by laser surface alloying. For this, chromium&hyphen;plated mild steel samples were treated with a pulsed Nd:YAG laser (300 W maximum power) by varying the average power level from 21.6 W to 30.0 W. The chromium content of the surface alloys was in the range of 3.0–27.0 wt&percnt;, with fairly uniform depth of alloying. Microscopy showed very fine austenite needles within elongated/equiaxed ferrite grains in the laser&hyphen;alloyed zone (LAZ). X&hyphen;ray diffraction indi...

    $25.00

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