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  • JLA Vol:25 Iss:1 (Spatial analysis of the back reflected laser light during CO<sub>2</sub>-laser cutting of metal sheets)


    Authors:
    David Schindhelm
    Graduate School of Excellence Advanced Manufacturing Engineering in Stuttgart (GSaME), Universita¨t Stuttgart, D-70569 Stuttgart, Germany and Institut fu¨r Strahlwerkzeuge (IFSW), Universita¨t Stuttgart, Pfaffenwaldring 43, D-70569 Stuttgart, Germany

    Rudolf Weber
    Thomas Graf
    Institut fu¨r Strahlwerkzeuge (IFSW), Universita¨t Stuttgart, Pfaffenwaldring 43, D-70569 Stuttgart, Germany


    During laser material processing such as laser welding or cutting, it is known that the whole laser power is not only absorbed in or transmitted through the interaction zone, but a significant percentage is also reflected back ...

    $25.00

  • JLA Vol:25 Iss:1 (Wettability modification of electrospun poly(&epsilon;-caprolactone) fiber by femtosecond laser irradiation)


    Authors:
    Lingna He
    Dave F. Farson
    Laboratory for Multiscale Processing and Characterization, The Ohio State University, 1248 Arthur E Adams Drive, Columbus, Ohio 43221 and Department of Materials Science and Engineering, The Ohio State University, 477 Watts Hall, 2041 College Road, Columbus, Ohio 43210

    Jian Chen
    Materials Science and Technology Division, Oak Ridge National Laboratory, One Bethel Road, P.O. Box 2008, MS-6095, Oak Ridge, Tennessee 37831-6095

    John J. Lannutti
    Department of Materials Science and Engineering, The Ohio State University, 477 Watts Hall, 2041 College Road, Columbus, Ohio 43210

    Stan I. Rokhlin
    Labora...

    $25.00

  • JLA Vol:25 Iss:1 (Fatigue crack propagation in laser alloyed ductile cast iron surface)


    Authors:
    Zheng-yang Li
    Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China and Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China

    Hai-yan Zhao
    Yu Gu
    Min-lin Zhong
    Bin Zhang
    Hong-jun Zhang
    Wen-jin Liu
    Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, People's Republic of China

    Zhi-yuan Ren
    Ming-jiang Yang

    $25.00

  • JLA Vol:25 Iss:1 (Implementation of a novel scan localization system for wireless sensor networks)


    Authors:
    K. Sun
    W. Huang
    Sachula Meng
    Y. Xiao
    M. T. Wang
    Z. Xiao
    Inner Mongolia University, Hohhot 010021, China


    A novel localization scheme called laser beam scan localization by combining grid and light (laser) with mobile localization policy for wireless sensor networks is designed. The scheme utilizes a moving location assistant (LA) with a laser beam, through which the deployed area is scanned. The LA sends identities to unknown nodes to obtain the locations of sensor nodes. High localization accuracy can be achieved without the aid of expensive hardware on the sensor nodes, as required by other localization systems...

    $25.00

  • JLA Vol:25 Iss:1 (Theoretical analysis of multiple-pulse thermal damage thresholds of the retina)


    Authors:
    C. D. Clark
    TASC Inc., 4141 Petroleum Road, Suite 4007 Fort Sam Houston, Texas 78234

    W. J. Marshall
    Laser Safety Specialties, Wilmington, Delaware 19810

    R. J. Thomas
    Air Force Research Laboratory, 711 HPW/RHDO, 4141 Petroleum Road, Fort Sam Houston, Texas 78234


    In this paper, we present a theoretical analysis of multiple-pulse thermal damage thresholds based on the Arrhenius integral damage model. We consider the dependence of thresholds on both the number of pulses and the pulse spacing and show that the trends can be understood by considering the thermal relaxation time. The biological data that exists in the multiple-pulse therma...

    $25.00

  • JLA Vol:25 Iss:1 (Review on laser drilling I. Fundamentals, modeling, and simulation)


    Authors:
    Wolfgang Schulz
    Fraunhofer Institute for Laser Technology, ILT, Aachen, Germany and Nonlinear Dynamics of Laser Processing, RWTH Aachen University, 52074 Germany

    Urs Eppelt
    Nonlinear Dynamics of Laser Processing, RWTH Aachen University, 52074 Germany

    Reinhart Poprawe
    Fraunhofer Institute for Laser Technology, ILT, Aachen, Germany and Nonlinear Dynamics of Laser Processing, RWTH Aachen University, 52074 Germany


    High peak power lasers have been used for years for ablating matter. The most relevant application of this process is laser marking. Marking meets the demands of applications although the quality of ablation has potential to b...

    $25.00

  • JLA Vol:25 Iss:5 (Stoichiometric 6H-SiC thin films deposited at low substrate temperature by laser ablation)


    Authors:
    J. G. Quin˜ones-Galva´n
    Physics Department, CINVESTAV-IPN, Apdo. Postal 14-740 Me´xico, D.F. 07360, Mexico

    J. S. Arias-Cero´n
    CICATA-IPN, Unidad Legaria, Me´xico D.F. 11500, Mexico

    F. de Moure-Flores
    Facultad de Qui´mica, Materiales, Universidad Auto´noma de Quere´taro, Quere´taro 76010, Mexico

    A. Herna´ndez-Herna´ndez
    A. Guille´n-Cervantes
    J. Santoyo-Salazar
    J. G. Mendoza-Alvarez
    M. Mele´ndez-Lira
    Physics Department, CINVESTAV-IPN, Apdo. Postal 14-740 Me´xico, D. F. 07360, Mexico


    ...

    $25.00

  • JLA Vol:25 Iss:5 (Numerical and experimental study of the effect of groove on plasma plume during high power laser welding)


    Authors:
    Cai Yan
    Xie Wen-Jing
    Wu Yue
    Sun Da-Wei
    Wu Yixiong
    Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, China and Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai 200240, China


    The influence of groove on the static feature and dynamic behavior of plasma plume during high power CO2 laser welding process was studied using a hydrodynamic three-dimensional model and corresponding experiments. The temperature, composition, and velocity of plasma plume along the incident path of laser beam were computed. The static morphology of plasma plume was analyzed through both models ...

    $25.00

  • JLA Vol:25 Iss:5 (Heat transfer and fluid flow in additive manufacturing)


    Authors:
    A. Raghavan
    H. L. Wei
    T. A. Palmer
    T. DebRoy
    Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802


    In laser-based direct energy deposition additive manufacturing, process control can be achieved through a closed loop control system in which thermal sensing of the melt pool surface is used to adjust laser processing parameters to maintain a constant surface geometry. Although this process control technique takes advantage of important in-process information, the conclusions drawn about the final solidification structure and mechanical properties of the deposited material are li...

    $25.00

  • JLA Vol:25 Iss:5 (Laser remote-fusion cutting with solid-state lasers)


    Authors:
    A. Wagner
    M. Lu¨tke
    A. Wetzig
    Fraunhofer Institute for Material and Beam Technology IWS, Winterbergstraße 28, 01277 Dresden, Germany

    L. M. Eng
    Institute of Applied Photophysics, TU Dresden, George-Ba¨hr-Straße 1, 01062 Dresden, Germany


    A laser remote cutting process is analyzed, which differs significantly from established laser cutting processes. On the one hand, no cutting gas is needed and a high working distance is realized. On the other hand—in opposite to conventional laser remote cutting—sheets of metal with thicknesses above 1 mm can be cut in one step. Examinations were carried out at the...

    $25.00

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