• JLA Vol:18 Iss:1 (Three-dimensional analytical model on laser-powder interaction during laser cladding)


    Authors:
    Yan-Lu Huang
    Jian Liu
    Nai-Heng Ma
    Jian-Guo Li
    School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, China 200030


    To compute the attenuation of laser power by powder stream and the temperature distribution of the powder particles arriving at different sites on the surface of the workpiece, a three-dimensional analytical model was presented based on Lambert-Beer theorem, Mie’s theory, and heat equilibrium principle. The obtained results revealed that for a given stream spread and speed of powder particles, the laser intensity distribution of laser spot and the temperature distribution of the powder part...

    $25.00

  • JLA Vol:23 Iss:3 (Parameter optimization of a laser-induced fluorescence system for <em>in vivo</em> screening of oral cancer)


    Authors:
    V. K. Unnikrishnan
    Rajesh Nayak
    Rodney Bernard
    Centre for Atomic and Molecular Physics, Manipal University, Manipal, 576 104, India

    K. Jeena Priya
    Department of Oral Medicine and Radiology, MCODS Mangalore, Manipal University, Manipal, 575 001, India

    Ajeetkumar Patil
    Centre for Atomic and Molecular Physics, Manipal University, Manipal, 576 104 India

    J. Ebenezer
    PG & Research Department of Physics, Jamal Mohamed College, Tiruchinapalli, Manipal, 620 020, India

    Keerthilatha M. Pai
    Department of Oral Medicine and Radiology, MCODS Manipal, Manipal University, Manipal,576 104 India<...>

    $25.00

  • JLA Vol:6 Iss:1 (Measurement of temperature and absorptance for laser processing applications)


    Authors:
    S. Ramanathan
    M. F. Modest
    Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802, U.S.A.


    The use of CO2 lasers has been successfully demonstrated for several manufacturing processes such as cutting, drilling, scribing, etc., of a wide range of materials. The absorptance of a material at the laser wavelength and at the material removal temperature substantially affect the efficiency of the laser machining process. Some materials have absorption bands in the mid&hyphen;infrared and the absorptance changes drastically with temperature at the CO2 laser wavelength of 10.6 μm. Additionally, the absor...

    $25.00

  • JLA Vol:16 Iss:2 (High-power CO<sub>2</sub> laser design &ldquo;from resonator end mirror to cutting lens focal point&rdquo;)


    Authors:
    David Toebaert
    HACO NV, Oekenestraat 120, 8800 Rumbeke, Belgium

    Wybo Wagenaar
    Infinite Simulation Systems BV, Lange Bunder 3, 4854 MB Bavel, Netherlands


    An algorithm is derived that allows calculating all optical parameters relevant to the design of a high-power CO2 laser, taking into account the practical needs of a flying-optics type of laser cutting machine. The novelty of the approach taken is that the resonator and the beam delivery optics are treated simultaneously, which allows for greater flexibility in design. To begin with, the often-used optical configuration of a stable resonator combined with a beam expander for collimation is mod...

    $25.00

  • JLA Vol:24 Iss:5 (The numerical analysis and measurements of temperature profile in fat tissue during neodymium-doped yttrium aluminum garnet laser irradiation for laser-assisted lipolysis)


    Authors:
    Jong-In Youn
    Department of Biomedical Engineering, College of Medical Science, Catholic University of Daegu, Hayangeup, Gyongsansi, Gyongbuk 712-702, South Korea


    The purpose of the study is to investigate the temperature profile of fat tissue during neodymium-doped yttrium aluminum garnet laser irradiation (1064, 1320, and 1444 nm wavelengths) for laser-assisted lipolysis. The numerical analysis was performed to assess the wavelength dependence of the temperature distribution in fat tissue. For the internal temperature profile measurements, a cannula was placed in the middle of fat tissue for laser irradiation, and two hypodermic thermocouple needles were placed at 2 and 5 mm...

    $25.00

  • JLA Vol:20 Iss:3 (Investigation of femtosecond laser induced thermal ablation of polyethylene)


    Authors:
    Andrew J. Lee
    Judith M. Dawes
    Michael J. Withford
    Centre of Ultrahigh-bandwidth Devices for Optical Systems (CUDOS) and MQPhotonics Research Centre, Department of Physics, Macquarie University, 2109 NSW, Australia


    We present a novel method for profiling high aspect ratio and undercut laser drilled holes using sacrificial layers. This profiling method is used to compare and contrast laser ablation of polyethylene films under exposure to ultraviolet (266 nm) and near-infrared (800 nm) radiation from an ultrafast, femtosecond laser. We find that ultraviolet femtosecond pulsed laser processing of this polymer exhibits similar characteristics to...

    $25.00

  • JLA Vol:8 Iss:2 (Laser materials processing at Sandia National Laboratories)


    Authors:
    James L. Jellison
    Michael J. Cieslak
    Sandia National Laboratories, Albuquerque, NM 87185, U.S.A.


    This paper describes the laser materials processing capabilities at Sandia National Laboratories. Some of the advances in the understanding of various aspects of laser materials processing which have been made by the laser materials processing team at Sandia are discussed.

    $25.00

  • JLA Vol:3 Iss:1 (Nursing Perspective: Clinical Laser Safety Issues Survey)


    Authors:
    Penny J. Smalley
    Laser Resources & Consulting Services, Chicago, Illinois


    $25.00

  • JLA Vol:14 Iss:3 (Pulsed laser driven deposition of spattered molten particles and its application to the manufacturing of wear-resistant coatings)


    Authors:
    Toru Nagai
    Takashi Inoue
    Applied Laser Engineering Research Institute, 2085-16 Uenoyama, Fukasawa, Nagaoka 940-2135, Japan

    Hirofumi Shimura
    Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, 1-2 Namiki, Tsukuba 305-8564, Japan


    In this article, we report on a new process for manufacturing metal coatings with submillimeter thickness by pulsed laser driven deposition of molten metal particles. The process of “laser spattering of molten particles” using a high pulse-energy laser is considered to be effective compared to the conventional physical vapor process based on vaporized ultrafine particle generati...

    $25.00

  • JLA Vol:18 Iss:4 (Influence of joint geometry and fit-up gaps on hybrid laser-metal active gas (MAG) welding)


    Authors:
    Y. Yao
    Jilin University and China FAW Group Corporation R&D Center, No. 35 Chuangye Street, 130011 Changchun, China

    M. Wouters
    Luleå University of Technology, Division of Manufacturing Systems Engineering, S-971 87, Luleå, Sweden

    J. Powell
    Luleå University of Technology, Division of Manufacturing Systems Engineering, S-971 87, Luleå, Sweden and Laser Expertise Ltd., Acorn Park Ind. Estate, Harrimans Lane, Nottingham NG7 2TR, United Kingdom

    K. Nilsson
    A. F. H. Kaplan
    Luleå University of Technology, Division of Manufacturing Systems Engineering, S-971 87, Luleå, Sweden

    ...

    $25.00

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