• JLA Vol:22 Iss:1 (Photodynamic therapy of cariogenic agents: A systematic review)


    Authors:
    Patri´cia Valente Araujo
    Maria Esperanza Cortes
    Luiz Thadeu de Abreu Poletto
    Restorative Dentistry Department (ODR-FO-UFMG), Federal University of Minas Gerais, Av. Antonio Carlos, 6627 Pampulha, Belo Horizonte, CEP 31270-901 Minas Gerais, Brazil


    The purpose of this systematic review was to evaluate the current status of the photodynamic therapy (PDT) against cariogenic micro-organisms. Publications with abstracts, published in English and available online in PubMed, were included. To identify relevant publications, all abstracts obtained from the search in PubMed were read independently by the authors. In total, 19 studies were reviewed. It wa...

    $25.00

  • JLA Vol:24 Iss:4 (In-process measuring procedure for sub-100 nm structures)


    Authors:
    M. Zimmermann
    A. Tausendfreund
    S. Patzelt
    G. Goch
    Bremen Institute for Metrology, Automation and Quality Science (BIMAQ), Linzer Straße 13, 28359 Bremen, Germany

    S. Kieß
    M. Z. Shaikh
    M. Gregoire
    S. Simon
    Institute of Parallel and Distributed Systems (IPVS), Universita¨tsstraße 38, 70569 Stuttgart, Germany


    Fast and nondestructive laser light scattering measurements characterize the quality of surfaces with sub-100 nm structures during the production process. The aim is to detect defective surface structures. The measurement procedure is based on a primary c...

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  • JLA Vol:5 Iss:1 (The Protective Characteristics of Polycarbonate Lenses Against CO<sub>2</sub> Laser Radiation)


    Authors:
    David H. Sliney
    Shawn D. Sparks
    Rodney L. Wood
    Laser Microwave Division, U.S. Army Environmental Hygiene Agency, Aberdeen Proving Ground, Maryland


    The vulnerability of plastic laser eye protection used with Class 4 CW lasers was studied using a high&hyphen;power industrial laser to produce 4 by 4 cm burn zones. Since a CW (or repetitively pulsed) laser beam can burn through such eye protectors, this potential is of concern to Laser Safety Officers (LSOs) prescribing laser eye protectors and transparent barriers for use around both the 10 to 80&hyphen;W CO2 lasers used in surgery as well as multi&hyphen;kilowatt industrial CO2 la...

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  • JLA Vol:15 Iss:4 (Laser-assisted etching of titanium foil in phosphoric acid for direct fabrication of microstructures)


    Authors:
    Y. S. Shin
    S. H. Jeong
    Department of Mechatronics, Kwangju Institute of Science and Technology, 1 Oryong-dong Puk-gu, Kwangju 500-712, Republic of Korea


    Characteristics of laser-induced thermochemical wet etching of titanium foil in phosphoric acid were investigated to examine the feasibility of this method for direct fabrication of microstructures. Variations of etch width, depth, and profile were examined for different combinations of laser power density, scanning speed of the beam focus, and etchant concentration which are the major process parameters governing temperature distribution on the sample surface and the reaction rate. Etch width increased almost li...

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  • JLA Vol:20 Iss:1 (Surface preparation by using laser cleaning in thermal spray)


    Authors:
    H. Li
    S. Costil
    H-L. Liao
    C. Coddet
    LERMPS, Universite´ de Technologie de Belfort-Montbe´liard, 90010 Belfort Cedex, France

    V. Barnier
    R. Oltra
    LRRS, Universite´ de Bourgogne, 21078 Dijon, France


    Pulsed laser cleaning has emerged as a promising technology to challenge traditional surface preparation methods. This paper introduces the PROTAL® process, which combines an in situ pulsed laser cleaning with thermal spraying techniques. This laser surface preparation avoids some drawbacks of the traditional degreasing and sand-blasting stages prior to thermal spraying, which is ...

    $25.00

  • JLA Vol:25 Iss:1 (Investigation on multi-track multi-layer epitaxial growth of columnar crystal in direct laser forming)


    Authors:
    XuanTuoi Do
    State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an 710049, China and Le Quy Don University, No. 100, Hoang Quoc Viet Street, Hanoi 7EN-218, Vietnam

    Dichen Li
    Anfeng Zhang
    Bin He
    Haiyang Zhang
    State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an 710049, China

    Tatkhoa Doan
    State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, No. 28, Xianning West Road, Xi'an 710049, China and Le Quy Don Technical Univers...

    $25.00

  • JLA Vol:23 Iss:1 (Mechanical and microstructural characteristics of the dissimilar materials butt joints by hybrid CO<sub>2</sub> laser-gas metal arc welding)


    Authors:
    HeeSeon Bang
    HanSur Bang
    Department of Naval Architecture and Ocean Engineering, Chosun University, Gwangju 501-759, Republic of Korea

    YouChul Kim
    Joining and Welding Research Institute, Osaka University, Osaka 567-0047, Japan

    IkHyun Oh
    Automotive Components Center, Korea Institute of Industrial Technology, Gwangju 500-480, Republic of Korea

    BackSub Sung
    Eco-friendly Components and Materials Education Center for Automobile, Gwangju 501-759, Republic of Korea


    This paper intends to present the applicability of hybrid [CO2 laser+gas metal arc (GMA)] welding process to dissimilar materials A...

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  • JLA Vol:7 Iss:2 (Hazardous emissions: characterization of CO<sub>2</sub> laser material processing)


    Authors:
    H. Haferkamp
    M. Goede
    K. Engel
    J.&hyphen;S. Wittbecker
    Laser Zentrum Hannover e.V., Hollerithallee 8, D&hyphen;3000 Hannover 21, Germany


    Parallel to the growth of laser technology is a high interest in safety in industrial surroundings. The characteristics of hazards resulting from laser processing are complex and highly interdependent. In addition, very little fundamental scientific research on this topic exists. The Laser Zentrum Hannover e.V. (LZH) is working on a research project subsidized by the BMFT (German Federal Ministry for Research and Technology) concerning the characterization and reduction of hazardous emissions resulting ...

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  • JLA Vol:14 Iss:1 (A procedure for laser hazard classification under the Z136.1-2000 American National Standard for Safe Use of Lasers)


    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
    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. The ANSI Z136.1 is a user standard, as opposed to a manufacturer standard like the Federal Las...

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  • JLA Vol:18 Iss:2 (Marking of lines on clay brick pavers by vitrification with a Nd:YAG laser)


    Authors:
    J. W. Restrepo
    J. M. Ferna´ndez-Pradas
    M. A. Go´mez
    P. Serra
    J. L. Morenza
    Universitat de Barcelona, Departament de Fi´sica Aplicada i Òptica, Marti´ i Franquès 1, E-08028 Barcelona, Spain


    Laser marking of architectural materials is nowadays an attractive technique for industrial and decorative applications. We report the clay brick pavers marking by vitrification with a continuous-wave Nd:YAG laser (λ=1.064 μm), at different output powers and scan speeds of the laser beam. The marked lines resulted in a dark green glassy phase. The width, depth, and cross-section area of ...

    $25.00

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