• $25.00

  • JLA Vol:16 Iss:1 (Laser annealing of silicon nanocrystal films formed by pulsed-laser deposition)


    Authors:
    C. F. Tan
    X. Y. Chen
    Laser Microprocessing Laboratory and Silicon Nano Device Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

    Y. F. Lu
    Department of Electrical Engineering, University of Nebraska, Lincoln, Nebraska 68588-0511

    Y. H. Wu
    B. J. Cho
    J. N. Zeng
    Laser Microprocessing Laboratory and Silicon Nano Device Laboratory, Department of Electric and Computer Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore


    We report the laser annealing effects on...

    $25.00

  • JLA Vol:20 Iss:2 (Laser bioeffects associated with ultrafast lasers: Role of multiphoton absorption)


    Authors:
    Randolph D. Glickman
    Department of Ophthalmology, University of Texas Health Science Center, San Antonio, Texas 78229-3900

    Thomas E. Johnson
    Department of Environmental and Radiological Health Sciences, Colorado State University, Ft. Collins, Colorado 80523

    Gary D. Noojin
    David J. Stolarski
    Michael L. Denton
    Northrup Grumman Warfighter and Applications Department, San Antonio, Texas 78228-1330

    Neeru Kumar
    Department of Ophthalmology, University of Texas Health Science Center, San Antonio, Texas 78229-3900

    Benjamin A. Rockwell
    US Air Force Research Laboratory, AFRL/HEDO, Brooks City...

    $25.00

  • JLA Vol:8 Iss:1 (Frequency–time characteristics of air‐borne signals from laser welds)


    Authors:
    D. Farson
    K. Hillsley
    J. Sames
    R. Young



    The acoustic emissions from laser lap welds in stainless steel sheet were recorded and analyzed. The acoustic signals emanating from the weld were sensed with an instrument microphone and analyzed using short‐time Fourier spectra to characterize their time‐frequency distributions. It was determined that the acoustic spectrum of good‐quality, full‐penetration welds could be differentiated from the spectra of poor‐quality welds, defined as either partial‐penetration welds or welds having a gap between the sheets being joined. A novel, relatively simple class...

    $25.00

  • JLA Vol:3 Iss:1 (Cutting of Al‐Alloys Using High‐Pressure Coaxial Nozzle)


    Authors:
    B. Biermann
    S. Biermann
    H. W. Bergmann
    Forschungsverbund Lasertechnologie Erlangen (FLE), Martensstr. 5, 8520 Erlangen, West Germany


    Aluminum alloys are used extensively in aerospace structures because of their high strength‐to‐weight characteristics. Unfortunately, these alloys are difficult to cut by laser processing. This behavior stems from: 1) their affinity for atmospheric gases, 2) their tendency to form high melting point reaction products and 3) the marked difference between their solidus and liquidus temperatures, which leads to formation of a mushy zone during cutting. This paper describes the results of a program directed t...

    $25.00

  • JLA Vol:14 Iss:3 (Effects of laser welding parameters on magnetic materials with the aid of a mechatronic measuring system)


    Authors:
    Hussein A. Abdullah
    School of Engineering, University of Guelph, Guelph, Ontario N1G 2W1, Canada

    Chris R. Chatwin
    School of Engineering, University of Sussex, Brighton BN1 9QT, United Kingdom


    This article reports results from an experimental investigation into laser welding of ferromagnetic material, which, for example, is of interest to the European Space Agency. The effects of laser welding power and translation velocities on the magnetism of ferromagnetic materials were studied. An automated system using a Hall effect transducer was constructed to measure the magnetic field transverse to the laser weld before welding, immediately after welding and thr...

    $25.00

  • JLA Vol:18 Iss:3 (Femtosecond laser production of metal surfaces having unique surface structures that are broadband absorbers)


    Authors:
    Neha Singh
    Dennis R. Alexander
    John Schiffern
    David Doerr
    Center for Electro Optics and Electrical Engineering Department, University of Nebraska-Lincoln, 248 N WSEC, Lincoln, Nebraska 68588-0511


    Femtosecond laser induced modification of surface structure and the optical properties of metals are studied. A Ti:sapphire femtosecond laser is used for ablating bulk aluminum 2024 T3 alloy and highly pure neutron activation quality gold metal samples at different laser irradiation parameters. The ablation parameters are optimized for the two metals to form a low reflection surface in the wavelength range of 0.3–50 μm. “Blac...

    $25.00

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  • JLA Vol:24 Iss:3 (Laser cladding with scanning optics: Effect of power adjustment)


    Authors:
    Joonas Pekkarinen
    Veli Kujanpa¨a¨
    Antti Salminen
    Laboratory of Laser Processing, Department of Mechanical Engineering, Lappeenranta University of Technology, Tuotantokatu 2, 53850 Lappeenranta, Finland


    Laser cladding with fiber laser using scanning optics is a relatively new way of laser cladding. Modern oscillating scanners enable laser power adjustment according to scanning direction. This is a versatile tool for making process more stable as well as modifying the shape of clad bead. Laser cladding was made using 5 kW IPG fiber laser with ILV-oscillating scanner, using 316L powder as clad material and S355 mild steel plate as substrate mate...

    $25.00

  • JLA Vol:6 Iss:4 (Investigation into the underwater laser welding of steel)


    Authors:
    G. J. Shannon
    J. Watson
    W. F. Deans
    Department of Engineering, Laser Laboratory, Kings College, University of Aberdeen, Aberdeen, U.K.


    An investigation was undertaken using a 1.2 kW carbon dioxide laser for underwater butt welding of BS 4360 43A and 50D steel, in order to assess the quality of the welds and to achieve an understanding of the laser/water/material interaction. Using a high‐speed camera, the temporal behavior of the melt pool and “plasma” dynamics surrounded by an aqueous environment were monitored. Experiments were undertaken to characterize the attenuation of the laser beam in the water as a function of various foca...

    $25.00

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