• JLA Vol:19 Iss:4 (Ablation and cutting of silicon wafer and micro-mold fabrication using femtosecond laser pulses)


    Authors:
    Ying Wang
    Nengli Dai
    Yuhua Li
    Xinlin Wang
    Peixiang Lu
    Wuhan National Laboratory for Optoelectronics and School of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China


    Femtosecond laser micromachining of silicon wafer at a relatively higher energy fluence level (>50 J/cm2) is investigated. Laser ablating spots and cutting kerfs are examined by means of charge coupled device camera and scanning electron microscopy. The area of ablated spots increases linearly with increasing the shot number from 1 to 16 and shows saturation with t...

    $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: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:3 Iss:1 (Nursing Perspective: Clinical Laser Safety Issues Survey)


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


    $25.00

  • JLA Vol:24 Iss:3 (2D longitudinal modeling of heat transfer and fluid flow during multilayered direct laser metal deposition process)


    Authors:
    Simon Morville
    Muriel Carin
    LIMATB, Universite´ de Bretagne-Sud/UEB, Centre de recherche Ch. Huygens, Rue de Saint Maude´, BP 92116, 56321 Lorient cedex, France

    Patrice Peyre
    Myriam Gharbi
    PIMM, UMR 8006 CNRS-Arts et Me´tiers Paris Tech, 151 Boulevard de l’Hoˆpital, 75013 Paris, France

    Denis Carron
    Philippe Le Masson
    LIMATB, Universite´ de Bretagne-Sud/UEB, Centre de recherche Ch. Huygens, Rue de Saint Maude´, BP 92116, 56321 Lorient cedex, France

    Re´my Fabbro
    PIMM, UMR 8006 CNRS-Arts et Me´tiers Paris Tech, 151 Boulevard de l’Ho&ci...

    $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:6 Iss:4 (Holographic optical elements (HOEs): A serious application of holography)


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


    Without disputing the excitement and sense of accomplishment associated with the production of display holograms, this paper suggests equal rewards from the production of holographic optical elements (HOEs). The elements described here are zone plates, diffraction gratings, interference filters and mirrors, and lenses. Ways of making each of these in an optics teaching laboratory are described, but the main emphasis will be on positive lens HOE.

    $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: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

Pages

help desk software

There is currently no content classified with this term.