• JLA Vol:8 Iss:4 (Some aspects of laser heating of engineering materials)


    Authors:
    B. S. Yilbas
    A. Z. Al‐Garni
    Mechanical Eng. Dept., KFUPM, P.O. Box 1913, Dhahran, Saudi Arabia


    Laser induced heating processes are important when a laser is used as a machine tool in industry, since the quality of the machining process strongly depends on the heating mechanism. The present study examines a heat transfer model that provides useful information on the laser induced interaction mechanism. Steady state and time dependent heating models are introduced and temperature profiles inside the materials are predicted. Using appropriate assumptions, the time for the surface temperature to reach 90% of its steady state value is estimated. To valid...

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  • JLA Vol:2 Iss:2 (Laser Induced Photochromic Flow Visualization)


    Authors:
    Thomas McWaid
    Ekkehard Marschall
    Department of Mechanical Engineering, University of California, Santa Barbara, CA 93106


    The photochromic flow visualization technique has been utilized to study several different liquid flows. The technique utilizes radiachromic dyes that can be dissolved in a number of liquids. The resulting dye‐solvent solutions remain colorless in the absence of ultraviolet radiation; however, the solutions turn dark blue when exposed to ultraviolet light. A nitrogen pulse laser has been constructed for use as source of ultraviolet radiation. When sharply focused, the emitted beam of ultraviolet light produces a very narrow, well define...

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  • JLA Vol:15 Iss:4 (Design and performance of multilevel phase fan-out diffractive optical elements for laser materials processing)


    Authors:
    Keiji Fuse
    Takayuki Hirai
    Toshihiko Ushiro
    Takeshi Okada
    Kenichi Kurisu
    Keiji Ebata
    Itami R&D Laboratories, Sumitomo Electric Industries, Ltd., 1-1-3 Shimaya, Konohana-ku, Osaka 554-0024, Japan


    A multilevel phase fan-out diffractive optical element (DOE) has been developed and introduced into various kinds of laser materials processing such as drilling, cutting, welding, and soldering. The larger the number of arrayed spots the DOE generates on the surface of the workpiece, the more sensitive the intensity uniformity of the spots becomes to fabrication errors, which are deviations between designed and fabric...

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  • JLA Vol:25 Iss:5 (Crack-free laser dicing of glass in the microelectronics industry)


    Authors:
    Guillaume Savriama
    GREMI-UMR 7344, CNRS/Universite´ d'Orle´ans, 14 rue d'Issoudun, BP 6744, F-45067 Orle´ans cedex 2, France and STMicroelectronics, 10 rue de Thalès de Milet, CS 97155, 37071 Tours Cedex 2, France

    Jose´ Mendez
    Laurent Barreau
    STMicroelectronics, 16 rue Pierre et Marie Curie, BP 7155, F-37071 Tours Cedex2, France

    Chantal Boulmer-Leborgne
    Nadjib Semmar
    GREMI-UMR 7344, CNRS/Universite´ d'Orle´ans, 14 rue d'Issoudun, BP 6744, F-45067 Orle´ans cedex 2, France


    This paper investigates laser dicing of glass (commercial Borofloat

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  • JLA Vol:20 Iss:1 (Optimization of production rate in diode laser hardening)


    Authors:
    Edoardo Capello
    Barbara Previtali
    Dipartimento di Meccanica, Politecnico di Milano, Via Bonardi 9, 20133 Milano, Italy


    The present paper is a contribution to the definition of optimal laser hardening conditions with production rate as the main goal. When the part to be treated is given, the optimization problem can be expressed in terms of minimal execution time subjected to two constraints: the depth of treatment and hardness of transformed layer. When the analytical expression of the objective function and the constraints was determined, the feasibility area was described and analyzed. Finally, an optimization algorithm was applied to identify the optimal solut...

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  • JLA Vol:24 Iss:4 (Direct laser writing-mediated generation of standardized topographies for dental implant surface optimization)


    Authors:
    Rainer Wittig
    Institut fu¨r Lasertechnologien in der Medizin und Messtechnik (ILM) an der Universita¨t Ulm, 89081 Ulm, Germany

    Erik Waller
    Georg von Freymann
    Arbeitsgruppe Optische Technologien und Photonik und Forschungszentrum OPTIMAS, Fachbereich Physik, Technische Universita¨t Kaiserslautern, 67663 Kaiserslautern, Germany

    Rudolf Steiner
    Institut fu¨r Lasertechnologien in der Medizin und Messtechnik (ILM) an der Universita¨t Ulm, 89081 Ulm, Germany


    The functionalization of dental implants, aiming at the improvement of long-term acceptance, is of pivotal interest in dental research. Bone, connectiv...

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