• JLA Vol:21 Iss:1 (Microstructural analysis and oxidation protection behavior of Cr&ndash;Ni surface coatings of 347 stainless steel by rapid mirror scanning of a high power CO<sub>2</sub> laser)

    Jorge A. Ramos-Grez
    Departamento de Ingenieri´a Meca´nica y Metalu´rgica, Pontificia Universidad Cato´lica de Chile, Vicun˜a Mackenna 4860, Santiago, Chile

    David L. Bourell
    University of Texas at Austin, Mechanical Engineering Department, Austin, Texas 78712

    Madhav Rao Govindaraju
    Karta Technologies, Inc., San Antonio, Texas 78249

    A surface coating technique that uses a 1 kW CO2 laser beam actuated by two high-speed raster-scanning mirrors was utilized to selectively consolidate predeposited powder coatings consisting of 50%Cr-50% Ni (wt %) over the surface of 347 austenitic stainless st...


  • JLA Vol:25 Iss:5 (Femtosecond laser post-processing of metal parts produced by laser additive manufacturing)

    Ilya Mingareev
    Tobias Bonhoff
    Ashraf F. El-Sherif
    Townes Laser Institute, CREOL, University of Central Florida, Orlando, Florida 32816

    Wilhelm Meiners
    Ingomar Kelbassa
    Fraunhofer Institute for Laser Technology, Aachen 52074, Germany

    Tim Biermann
    Joining Technologies Research Center, East Granby, Connecticut 06026

    Martin Richardson
    Townes Laser Institute, CREOL, University of Central Florida, Orlando, Florida 32816

    High-repetition rate femtosecond laser radiation was utilized to improve surface quality of metal parts manufactured by laser additive techniques. Different lase...


  • JLA Vol:24 Iss:1 (Surgical treatment of squamous cell carcinoma of tongue with carbon dioxide laser radiation (CO<sub>2</sub>))

    Walter Niccoli-Filho
    Lu´cio Murilo-Santos
    Aline R. C. Morosolli
    Gerusa de Oliveira Moura Cardoso
    Joa˜o Vitor dos Santos Canellas

    In this clinical study, we proposed to observe the efficacy of the treatment of squamous cell carcinoma of the tongue (SCCT) by carbon dioxide (CO2) laser surgery. Twelve patients with SCCT were treated with excisional surgery using the CO2 laser with a spot size of 0.8 mm, 10 W, power density of 2.5 W/cm2 in continuous mode, and under constant vacuum removal of the plume. The post surgical clinical evaluations were done every day until the sutures...


  • JLA Vol:6 Iss:2 (Laser safety notes)

    Robert Weiner
    Weiner Associates, Manhattan Beach, California, U.S.A.


  • JLA Vol:15 Iss:1 (Specific energy for pulsed laser rock drilling)

    Z. Xu
    C. B. Reed
    G. Konercki
    Technology Development Division, Argonne National Laboratory, Argonne, Illinois 60540

    R. A. Parker
    Parker Geoscience Consulting, LLC, Arvada, Colorado 80403

    B. C. Gahan
    Gas Technology Institute, Des Plains, Illinois 60018

    S. Batarseh
    R. M. Graves
    Department of Petroleum Engineering, Colorado School of Mines, Golden, Colorado 80401

    H. Figueroa
    Petroleos de Venezuela INTEVEP, S.A., Caracas 1070A, Venezuela

    N. Skinner
    Halliburton Energy Service, Carrollton, Texas 75006

    Application of advanced high power ...


  • JLA Vol:19 Iss:1 (Melt pool temperature and its effect on clad formation in pulsed Nd:yttrium-aluminum-garnet laser cladding of Stellite 6)

    S. Sun
    Y. Durandet
    M. Brandt
    Industrial Laser Applications Laboratory, Industrial Research Institute Swinburne, Swinburne University of Technology, 533–545 Burwood Road, Hawthorn, VIC 3122, Australia

    The effective melt pool temperature in pulsed Nd:yttrium-aluminum-garnet laser cladding of Stellite 6 was measured with a two-color pyrometer. The pulse peak temperature (Tp) and durations when the melt pool temperature is above the melting point of Stellite 6 powder (t1) and substrate (t2) in each pulse have been calculated and averaged. The effects of laser operating parameters (pulse energy, pulse frequency, spot...


  • JLA Vol:1 Iss:3 (Performance of a Broadband Free&hyphen;Electron Laser and Preliminary Studies on Its Application to Biology and Medicine)

    Stephen Benson
    John Madey
    Dept. of Physics, Duke University, Durham NC 27706

    Richard Straight
    Brett Hooper
    Utah Laser Institute, Department of Veterans Affairs and the University of Utah Medical Centers, Salt Lake City, Utah 84148

    Recent performance improvements in the free&hyphen;electron laser (FEL) have allowed it to operate at a level suitable for most applications in laser medicine. A brief description of the operation of a free&hyphen;electron laser will be presented. The performance desired in a medical FEL will be described and the performance to date of the Mark III mid&hyphen;infrared to visible FEL at Stanford Univer...


  • JLA Vol:8 Iss:4 (The role of oxygen pressure in laser cutting mild steels)

    A. Ivarson
    J. Powell
    C. Magnusson

    This paper presents the results of an experimental program investigating the effects of using high pressure oxygen as assist gas in combination with a pulsed laser while cutting medium thick mild steel plates. It was discovered that if the pulse conditions are optimized, the maximum cutting speed for a set average laser power could be increased by up to 10&percnt; compared to low oxygen pressure continuous wave (CW) laser cutting. The assist gas was found to have two optimum pressure ranges between which the material suffered from burning on the cut edge. The paper presents a phenomenological model to explain the ch...


  • JLA Vol:2 Iss:2 (A Comparison of Methods for Accurate Image Centroid Position Determination with Matrix Sensors)

    Paul G. Backes
    Warren H. Stevenson
    School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907

    Optical methods for the measurement of position, part dimensions, or alignment are finding increased application in manufacturing operations. Several of these methods utilize analog or digital position sensitive detectors to find the centroid of an illuminated spot on the detector. The objective of this study was to determine the accuracy with which the centroids of a direct laser beam and a circular incoherent image could be determined using a matrix array sensor. Centroids were found using five different analytical methods. The results showed t...


  • JLA Vol:17 Iss:3 (Laser welding of the synchronizer stop ring and the rear gear in a manual transaxle)

    G. Casalino
    Dipartimento di Ingegneria Meccanica e Gestionale, Politecnico di Bari, Bari, Italy

    The focused laser beam is one of the highest power density sources available to industry today. When the “keyhole mode” is used for welding the result is characterized by a parallel-sided fusion zone, narrow width, and deep penetration. Therefore, a higher value of the joining efficiency (i.e., the reciprocal of the specific welding energy) is obtained and less energy is necessary for heating which generates a large heat affected zone and low mechanical distortion. This article focuses on the application of the CO2 seam laser welding of the stop ring of the s...



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