• JLA Vol:16 Iss:4 (A finite element method approach for thermal analysis of laser cladding of magnesium alloy with preplaced Al–Si powder)


    Authors:
    L. F. Guo
    T. M. Yue
    H. C. Man
    The Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong


    A numerical model based on the finite element method (FEM) has been developed to simulate the temperature profile of laser cladding with preplaced metal powders. The FEM model is capable of simulating the three-dimensional thermal field of the cladding zone under the condition of a moving heat source, taking into consideration the thermal contact resistance between the powder bed and the substrate. Verification experiments were conducted by the laser cladding o...

    $25.00

  • JLA Vol:21 Iss:2 (Laser use vs. handpiece for tooth preparation: A preliminary <em>in vitro</em> study)


    Authors:
    B. Go¨kc¸e
    B. O¨zpinar
    C. Artunc¸
    G. Aksoy
    Department of Prosthodontics, School of Dentistry, Ege University, 35100 Turkey


    The key fields of research of dental lasers have focused on the use of different wavelengths on hard and soft tissues; however it is not clear whether they can be used for tooth preparation for full coverage restorations or not. The objective of this study was to investigate the possibility of tooth preparation for full coverage restorations using a scanner assembly added-on Er:YAG laser system and compare the tooth preparation durations performed with dental drills and the laser. The 20 freshly e...

    $25.00

  • JLA Vol:1 Iss:2 (ICALEO Holds First Conference on Lasers in Dentistry)


    Authors:
    Harvey Wigdor
    Chief of Dental Service, Ravenswood Hospital Medical Center and Wenske Laser Center, Chicago, Illinois


    $25.00

  • JLA Vol:24 Iss:2 (Laser induced backside wet and dry etching of solar glass by short pulse ytterbium fiber laser irradiation)


    Authors:
    He Chao
    Liu Furong
    Wang Min
    Yuan Jianwen
    Chen Jimin
    Institute of Laser Engineering, Beijing University of Technology, Chaoyang District, Beijing 100124, China


    Microstructures fabricated on the surface of solar glass have the potential to improve the performance of solar cells. In this paper, in order to overcome the high transmittance to 1064 nm center wavelength fiber laser irradiation and realize high efficiency process on transparent glass substrates, different absorber materials, including alumina powder, alumina ceramic wafers, and copper sulphate solutions, were applied for dry and wet etching under the irradiation of ...

    $25.00

  • JLA Vol:6 Iss:3 (Fast manipulation and modulation of laser beams with spinning devices)


    Authors:
    Gareth T. Williams
    Physics Department, San Jose State University, San Jose, CA, U.S.A.


    Inexpensive battery&hyphen;operated motors can be used for a variety of safe, fast, laser beam&hyphen;steering and modulation activities, a number of which have been developed as part of the Laser Applications in Science Education (LASE) Project at San Jose State University. Those described here will be a laser stroboscope using a spinning slotted disc; a circular scanning system using a tilted rotating mirror, for bar&hyphen;code reading, investigating the focusing properties of lenses, lens aberrations and beam profiles; and a rotating polarizing sheet.

    $25.00

  • JLA Vol:15 Iss:2 (Corrosion resistance of laser-fabricated metal&ndash;matrix composite layer on stainless steel 316L)


    Authors:
    K. H. Lo
    Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

    C. T. Kwok
    Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau, Taipei, Macau, China

    F. T. Cheng
    Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

    H. C. Man
    Department of Manufacturing Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China


    Laser fabrication of ceramic-reinforced metal–matrix composite (MMC) layer on stainless steel 316L was achieved by a two-st...

    $25.00

  • JLA Vol:19 Iss:2 (How Long After Laser Irradiation Should Cellular Responses be Measured to Determine the Laser Effect?)


    Authors:
    Denise Hawkins
    Heidi Abrahamse
    Laser Research Group, Faculty of Health Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, Johannesburg 2028, South Africa


    Background: Low level laser therapy (LLLT) is a type of photomodulation, which uses photons to modulate biological activity. This photobiological effect depends on the wavelength, dose, intensity, as well as cell culture conditions. One problem with most of the published data on low level laser irradiation is that most studies do not record the duration between the exposure and the evaluation. It has been established that a single dose of 5 J/cm2 stimulates cell prolifer...

    $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: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...

    $25.00

  • 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...

    $25.00

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