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  • JLA Vol:1 Iss:3 (Chemical Composition of Laser‐Tissue Interaction Smoke Plume)


    Authors:
    John M. Kokosa
    GMI Engineering & Management Institute, Flint, Michigan 48504 U.S.A.

    John Eugene
    Beckman Laser Institute, Irvine, California 92715 U.S.A.


    Lasers are assuming an increasingly important role in surgical procedures. However, several studies have shown that the smoke produced by laser‐tissue interaction is an airway irritant. Preliminary studies in our laboratories have shown that potentially hazardous chemicals, including benzene, formaldehyde and acrolein are present in the smoke plume resulting from CO2 and Nd:YAG laser interaction with animal tissue, even at low power densities. Since these chemicals are classified a...

    $25.00

  • JLA Vol:8 Iss:4 (Some aspects of laser heating of engineering materials)


    Authors:
    B. S. Yilbas
    A. Z. Al‐Garni
    Mechanical Eng. Dept., KFUPM, P.O. Box 1913, Dhahran, Saudi Arabia


    Laser induced heating processes are important when a laser is used as a machine tool in industry, since the quality of the machining process strongly depends on the heating mechanism. The present study examines a heat transfer model that provides useful information on the laser induced interaction mechanism. Steady state and time dependent heating models are introduced and temperature profiles inside the materials are predicted. Using appropriate assumptions, the time for the surface temperature to reach 90% of its steady state value is estimated. To valid...

    $25.00

  • JLA Vol:2 Iss:2 (Laser Induced Photochromic Flow Visualization)


    Authors:
    Thomas McWaid
    Ekkehard Marschall
    Department of Mechanical Engineering, University of California, Santa Barbara, CA 93106


    The photochromic flow visualization technique has been utilized to study several different liquid flows. The technique utilizes radiachromic dyes that can be dissolved in a number of liquids. The resulting dye‐solvent solutions remain colorless in the absence of ultraviolet radiation; however, the solutions turn dark blue when exposed to ultraviolet light. A nitrogen pulse laser has been constructed for use as source of ultraviolet radiation. When sharply focused, the emitted beam of ultraviolet light produces a very narrow, well define...

    $25.00

  • JLA Vol:16 Iss:3 (A procedure for the estimation of intrabeam hazard distances and optical density requirements under the ANSI Z136.1-2000 Standard)


    Authors:
    Robert J. Thomas
    Benjamin A. Rockwell
    Air Force Research Laboratory, Brooks AFB, Texas 78235-5215

    Wesley J. Marshall
    USACHPPM, Aberdeen Proving Ground, Maryland 21010-5422

    Robert C. Aldrich
    Mary F. Gorschboth
    Sheldon A. Zimmerman
    Dahlgren Division, Naval Surface Warfare Center, Dahlgren, Virginia 22448-5100

    R. James Rockwell
    Rockwell Laser Industries, Cincinnati, Ohio 45243


    Over the past few years, a comprehensive rewrite of the American National Standard for Safe Use of Lasers (ANSI Z136.1) has been conducted [American National Standards Institute, Z136.1-2000 America...

    $25.00

  • JLA Vol:21 Iss:1 (Enhancing dual phase steel formability by diode laser heat treatment)


    Authors:
    Edoardo Capello
    Barbara Previtali
    Politecnico di Milano, Dipartimento di Meccanica Via La Masa 1, I-20156 Milan, Italy


    This paper studies the effect of different typologies of surface treatment by diode laser on the local formability of dual phase steel. An analytical thermal model allowed the temperature and cooling rate curves to be predicted and used to select the process parameter conditions. Microhardness measurements, microstructure observations, mechanical tensile test, and Erichsen cup test allowed the positive effect of the heat treatment on dual phase steel formability to be quantified.

    $25.00

  • JLA Vol:24 Iss:4 (Direct laser writing-mediated generation of standardized topographies for dental implant surface optimization)


    Authors:
    Rainer Wittig
    Institut fu¨r Lasertechnologien in der Medizin und Messtechnik (ILM) an der Universita¨t Ulm, 89081 Ulm, Germany

    Erik Waller
    Georg von Freymann
    Arbeitsgruppe Optische Technologien und Photonik und Forschungszentrum OPTIMAS, Fachbereich Physik, Technische Universita¨t Kaiserslautern, 67663 Kaiserslautern, Germany

    Rudolf Steiner
    Institut fu¨r Lasertechnologien in der Medizin und Messtechnik (ILM) an der Universita¨t Ulm, 89081 Ulm, Germany


    The functionalization of dental implants, aiming at the improvement of long-term acceptance, is of pivotal interest in dental research. Bone, connectiv...

    $25.00

  • JLA Vol:5 Iss:1 (Tutorial Guide: Laser Measurement Techniques Guide For Hazard Evaluation. Part 1)


    Authors:
    Terry Lyon
    Laser Microwave Division, U.S. Army Environmental Hygiene Agency


    A tutorial guide is presented to provide uniform guidance when performing radiometric measurements upon laser systems to perform a hazard evaluation. This guide was requested by and presented to the Department of Defense (DOD) Laser System Safety Working Group (LSSWG) to serve as a standardized method when performing hazard evaluations primarily upon tactical and training military laser systems including laser rangefinders and designators. Technical information is provided in detail to select a suitable detector, preform radiometric measurements, assess laser system pointing errors, calculate laser pr...

    $25.00

  • JLA Vol:15 Iss:1 (Effect of wire feed position on laser welding with filler wire)


    Authors:
    A. S. Salminen
    V. P. Kujanpa¨a¨
    Lappeenranta University of Technology, Laser Processing Centre, Tuotantokatur 2, FIN 53850 Lappeenranta, Finland


    The utilization of the laser welding process with filler wire addition is often considered a complicated and difficult process which has too high accuracy demands for a work shop floor. This study shows the effect of some of the most important welding variables to the quality and efficiency of laser welding when welding with filler wire. The material used was a common structural steel St52/37 of 6 mm in thickness. The joint type used was a butt joint. Acceptable weld quality was achieved with most of the tested p...

    $25.00

  • JLA Vol:19 Iss:1 (Combining high-speed laser perforation and cold roll forming for the production of biomedical microfiltration membranes)


    Authors:
    M. Baumeister
    K. Dickmann
    Laser Center University of Applied Sciences Muenster (LFM), Stegerwaldstrasse 39, 48565 Steinfurt, Germany

    A. P. Hoult
    SPI, 3 Wellington Park, Tollbar Way Hedge End, Southampton SO30 2QU, United Kingdom


    A novel high speed two-step technique capable of performing large matrices of very small pores with micron dimensions in large sheets of thin stainless steel foils has been developed. This process combination is initiated by high-speed “on-the-fly” laser perforation. A 100 W fiber laser is capable of a very high drilling rate making it an attractive option for the creation of large drilling matrices ...

    $25.00

  • JLA Vol:23 Iss:1 (Optimal process parameters for thermoplastic polyetheretherketone joints fabricated using transmission laser welding and Lumogen<sup>&reg;</sup> IR absorptive pigment)


    Authors:
    Negin Amanat
    School of Physics, University of Sydney, New South Wales 2006, Australia and Cochlear Ltd., 14 Mars Rd., Lane Cove, New South Wales 2066, Australia

    Cedric Chaminade
    John Grace
    Raymax Applications, P.O. Box 958, Newport Beach, New South Wales 2106, Australia

    Natalie L. James
    Cochlear Ltd., 14 Mars Rd., Lane Cove, New South Wales 2066, Australia

    David R. McKenzie
    School of Physics, University of Sydney, New South Wales 2006, Australia


    This study investigates the effects of the process parameters (laser power and irradiation time) on the bond quality of transmission laser welded polyether...

    $25.00

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