• JLA Vol:2 Iss:3 (Current State‐of‐the‐Art of Contouring Techniques in Manufacturing)


    Authors:
    Kevin G. Harding
    Industrial Technology Institute, Sensor Center for Improved Quality, Ann Arbor, Michigan 48106


    A manager with a major automobile manufacturer once made the comment that “the best thing we ever did to improve quality was give the guys on the floor a caliper to measure the parts”. As the tolerances on manufacturing become tighter, the need for accurate measurement has also increased. Hand fitting of parts to each other does not work in modern automated factories. Gauges in the past have been built to provide a fixed set of measurements of a known part. This practice too has been changing due to the trend toward flexible manufacturing. Now the gages...

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  • JLA Vol:15 Iss:3 (Preparation of polyperinaphthalenic organic semiconductive nanoparticles by excimer laser ablation and their application to optic and electronic devices)


    Authors:
    Satoru Nishio
    Hiroshi Fukumura
    Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki, Sendai, Miyagi 980-8578, Japan

    Kazuyuki Tamura
    Jun Murata
    Junko Kitahara
    Teruhiko Kan
    Akiyoshi Matsuzaki
    Department of Chemistry for Materials, Faculty of Engineering, Mi’e University, 1515 Kamihama-cho, Tsu, Mi’e 514-8507, Japan

    Nobuo Ando
    Yukinori Hato
    Kanebo LTD., 3-1, Kanebo-cho, Hofu, Yamaguchi 747-0823, Japan


    Polyperinaphthalene (PPN) nanoparticles are prepared by excimer laser ablation (ELA) of a 3, 4, 9, 10-perylenetetracarbox...

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  • JLA Vol:25 Iss:5 (Investigation into the effects of process parameters on bending angle in the laser bending of tailor machined blanks based on a statistical analysis)


    Authors:
    Mehdi Safari
    Mahmoud Farzin
    Abbas Ghaei
    Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran


    In this paper, the effects of process parameters on bending angle in laser bending of tailor machined blanks are investigated experimentally. The Taguchi experimental design method is employed to study various parameters, which significantly affect the bending angle in the laser bending of tailor machined blanks. The start point of scan path, irradiating method, laser output power, beam diameter, and number of radiation passes are considered in the evaluations. A L18(21×34) Ta...

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  • JLA Vol:19 Iss:4 (Bench-top antigen detection technique that utilizes nanofiltration and fluorescent dyes which emit and absorb light in the near infrared)


    Authors:
    Vanessa A. Varaljay-Spence
    Department of Biological, Geological and Environmental Sciences, Cleveland State University, Cleveland, Ohio 44115, NASA Glenn Research Center at Lewis Field, Brook Park, Ohio 44135, and Department of Microbiology, University of Georgia, Athens, Georgia 30602

    Maximilian C. Scardelletti
    NASA Glenn Research Center at Lewis Field, Brook Park, Ohio 44135


    This article discusses the development of a bench-top technique to detect antigens in fluids. The technique involves the use of near infrared (NIR) fluorescent dyes conjugated to antibodies, centrifugation, nanofilters, and spectrometry. The system used to detect the antigens utili...

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  • JLA Vol:24 Iss:4 (Morphology of nanoscale structures on fused silica surfaces from interaction with temporally tailored femtosecond pulses)


    Authors:
    Lars Englert
    Matthias Wollenhaupt
    Cristian Sarpe
    Dirk Otto
    Thomas Baumert
    Institut fuer Physik and CINSaT, Universitaet Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel, Germany


    Laser control of two basic ionization processes on fused silica, i.e., multiphoton ionization and avalanche ionization, with temporally asymmetric pulse envelopes is investigated. Control leads to different final electron densities/energies as the direct temporal intensity profile and the time inverted intensity profile address the two ionization processes in a different fashion. This results in observed different thresholds for material modification o...

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  • JLA Vol:5 Iss:2 (Experimental Method for Determining the Coherence Length of CW Lasers Using a Michelson Interferometer)


    Authors:
    Sami Alaruri
    Allison Gas Turbine Division, General Motors Corporation, Sensor Development Group


    Theoretical analysis of the relationship between coherence length and the resonant‐longitudinal modes in an optical cavity is given. A Michelson interferometer is used to measure the coherence lengths of two CW He‐Ne laser cavities. Analysis of the experimental measurements shows good agreement with the theoretically predicted values.

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  • JLA Vol:14 Iss:1 (Experimental study on surface decontamination by laser ablation)


    Authors:
    X. Zhou
    K. Imasaki
    H. Furukawa
    C. Yamanaka
    Institute for Laser Technology, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan

    S. Nakai
    Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan


    A high-power pulsed Nd:YAG laser was employed to irradiate a 20-μm-thick Zn coating on a carbon steel surface. The ablation rate was defined as ablated volume divided by consumed laser energy, and was used to assess ablation cleaning ability. The relationships of ablation rate to laser pulse width and ablation rate to laser fluence were investigated, and optimal processing conditions were dete...

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  • JLA Vol:1 Iss:4 (Laser Accidents: Are They All Reported and What Can Be Learned from Them?)


    Authors:
    R. James Rockwell
    Rockwell Laser Industries, Cincinnati, Ohio


    $25.00

  • JLA Vol:18 Iss:1 (Optical viewport assembly for eye-safe monitoring of thin film deposition)


    Authors:
    Kevin Robbie
    Cristina Buzea
    Olivier Landry
    Cory Dean
    Department of Physics, Queen’s University, Kingston, Ontario K7L 3N6, Canada


    This article discusses the design and application of a simple eye-safe monitoring assembly of thin film deposition and its advantages over the existent eye protection filters. This assembly prevents users from being exposed to the radiation field caused by lasers or incandescent objects during thin film deposition. Its design is simple, the device being reliable and easy to operate.

    $25.00

  • JLA Vol:22 Iss:4 (A fast method for morphological analysis of laser drilling holes)


    Authors:
    M. Schneider
    L. Berthe
    M. Muller
    R. Fabbro
    Laboratoire PIMM (CNRS) ARTS et METIERS ParisTech, 151 Boulevard de l’Hopital, 75013 Paris, France


    This paper presents an original method for analyzing laser drilled holes. The so-called Direct Observation of Drilled hOle (DODO) method is introduced and its applications. The hole characterization that’s been made is compared with x-ray radiography and cross-section analysis. Direct Observation of Drilled hole provides instantaneously surface state, geometric shape, as well as recast layer structure, without additional operation. Since no mounting resin is used to embed the sample, th...

    $25.00

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