• JLA Vol:7 Iss:3 (Institut de Soudure Laser Center)


    Authors:
    J. C. Goussain
    A. Chehaibou
    Institut de Soudure, 4 Boulevard Henri Becquerel, 57110 Yutz, France


    $25.00

  • JLA Vol:7 Iss:3 (Institut fu¨r Strahlwerkzeuge (IFSW), University of Stuttgart)


    Authors:
    Helmut Hu¨gel
    Institut fu¨r Strahlwerkzeuge, University of Stuttgart, Pfaffenwaldring 43, D‐70569 Stuttgart, Germany


    $25.00

  • JLA Vol:7 Iss:3 (Laser beam surveying, refractive index measurements and the making of a 360° reflection hologram)


    Authors:
    David Foster
    Notre Dame High School, 596 South Second St., San Jose, California 95112, U.S.A.


    Triangulation measurements, using a laser to find the height of a room and of buildings, will be described first. This will be followed by triangulation and laser beam divergence measurements for range finding. The use of a hollow prism to hold liquids, whose refractive indicies are to be found, will then be described. The final topic will describe how a 360° reflection hologram was made at Notre Dame High School, utilizing three lasers and beam spreaders and four lasers and beam spreaders. The 360° hologram, made by a student, will be available for viewing.

    $25.00

  • JLA Vol:7 Iss:3 (Laser operator training and competency assessment in the community hospital setting)


    Authors:
    Michael A. Connor
    Allan F. Cook
    Marymount Hospital, Cleveland, Ohio, U.S.A.


    At the 279 bed Marymount community hospital, Cleveland, Ohio, the importance of providing a safe laser environment for patients as well as staff was identified. The decision was made to cross‐train all full‐time RNs, LPNs, and SAs to allow flexibility in staffing all laser procedures with a qualified operator. A competency based training program was implemented, utilizing a combination of techniques to assist the adult learner. Selected video tapes were used to teach laser physics and applications. Comprehension was assessed through written and oral quizzing. Individual time...

    $25.00

  • JLA Vol:7 Iss:3 (Study of liquid and vapor ejection processes during laser drilling of metals)


    Authors:
    Bekir S. Yilbas¸
    Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia


    In an experimental investigation of laser–metal interaction, one of the important parameters is the propagation velocity of the liquid–vapor interface. The quantity appears as a direct result of the theoretical examination of the interaction and may be used to test the accuracy of the theory. Consequently, in the present study, the nature of the interaction mechanism between a pulsed laser beam and metals is examined using streak photographs of the ejecta from four metals: titanium, tantalum, nickel, and EN58B stainless steel. It...

    $25.00

  • JLA Vol:7 Iss:4 (Laser Applications in Science Education (LASE) Project at Santa Teresa High School)


    Authors:
    James D. Sagray
    Science Department, Santa Teresa High School, San Jose, California 95123, U.S.A.


    The goal of the Laser Applications in Science Education (LASE) Project, centered at San Jose State University, is to bring significant laser technology and optics to the secondary level with a special emphasis on student research and publication. Its implementation at Santa Teresa High School has focused on permitting all students in physics classes (32/period) to experience laser labs in small groups working throughout the classroom. In addition to receiving this exposure, all physics students are encouraged to do original research projects and to compete for cash or other prize...

    $25.00

  • JLA Vol:7 Iss:4 (Laser applications in science education (LASE) Project: an introduction to photonics at the secondary school level)


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


    $25.00

  • JLA Vol:7 Iss:4 (Laser cutting of thick sectioned steels using gas flow impingement on the erosion front)


    Authors:
    P. M. Ilavarasan
    P. A. Molian
    Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, U.S.A.


    An off‐axial gas jet has been developed that has the potential to extend the laser's effectiveness by improving the rate at which parts can be machined, producing high‐quality surfaces, enhancing the cutting thickness, and adding to the range of materials that can be machined. In laser cutting, an erosion front (liquid–gas region) forms at the momentary end of the cut. Laser heating, exothermic reactions and shear force between the gas flow and the molten layer dictate the material removal rates. The principle of the off‐axi...

    $25.00

  • JLA Vol:7 Iss:4 (Laser machining of ablating materials — overlapped grooves and entrance/exit effects)


    Authors:
    Michael F. Modest
    Sriram Ramanathan
    Armin Raiber
    Birgit Angstenberger



    A three‐dimensional conduction model has been developed to predict the transient temperature distribution inside a thick solid that is irradiated by a moving laser source, and the changing shape of single or overlapping grooves carved into it by evaporation of material. The laser may operate in CW or in pulsed mode (with arbitrary temporal intensity distribution) and may have an arbitrary spatial intensity profile. The governing equations are solved, for both constant and variable thermophysical properties, using a finite‐difference method on a boundary&...

    $25.00

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