JLA Vol:20 Iss:2 (New data on the variation of laser induced retinal-damage threshold with retinal image size)
Authors:
J. A. Zuclich
P. E. Edsall
Northrop Grumman IT, 4241 Woodcock Dr., Suite B-100, San Antonio, Texas 78228-1330
D. J. Lund
B. E. Stuck
US Army Medical Research Detachment, Brooks AFB, Texas 78235-5138
S. Till
R. C. Hollins
UK Dstl, Malvern, WR 143PS, United Kingdom
P. K. Kennedy
L. N. McLin
Optical Radiation Branch, USAF/HEDO, Brooks AFB, Texas 78235-5215In earlier studies, we examined the dependence of the laser induced retinal damage threshold on retinal image size for extended-source ocular exposures. We reported the spot-size dependence of the retinal thres...
$25.00
JLA Vol:20 Iss:2 (Review of exposure limits and experimental data for corneal and lenticular damage from short pulsed UV and IR laser radiation)
Authors:
Karl Schulmeister
Austrian Research Centers, A-2444 Seibersdorf, Austria
David H. Sliney
US Army Center for Health Promotion and Preventive Medicine, Aberdeen Proving Ground, Maryland 21010-5422
John Mellerio
Department of Ophthalmology, Rayne Institute, St. Thomas’ Hospital, London, SE1 7EH, United Kingdom
David J. Lund
Bruce E. Stuck
US Army Medical Research Detachment, Walter Reed Army Institute of Research, Brooks City-Base, San Antonio, Texas 78235-5108
Joseph A. Zuclich
Northrop Grumman Information Technology, San Antonio, Texas 78288-1330Laser exposure limits as ...
$25.00
JLA Vol:20 Iss:2 (Spectral dependence of retinal thermal injury)
Authors:
David J. Lund
Peter Edsall
Bruce E. Stuck
U.S. Army Medical Research Detachment, Walter Reed Army Institute of Research, 7914 Dave Erwin Drive, Brooks City-Base, Texas 78235-5106The action spectrum for light-induced damage to the retina results from wavelength dependent transmission of the pre-retinal ocular media, wavelength dependent absorption in retinal chromophores, and chromatic aberration of the eye optics. While various light/tissue interaction mechanisms have been implicated, thermal mechanisms dominate in the visible and near-infrared spectrum for all exposure durations shorter than a few seconds and longer than 1 ns. A number of inve...
$25.00
JLA Vol:20 Iss:2 (Super-short times laser welding of thermoplastic resins using a ring beam optics)
Authors:
Guojian Xu
Akihiko Tsuboi
Takemitsu Ogawa
Takeshi Ikeda
Laser X CO., Ltd., 7 Korukada Shinmayashi-cho Chiryu-shi Aichi 472-0017, Japan
Muneharu Kutsuna
Graduate School of Engineering, Nagoya University, 1 Furo-cho Chikusa-ku, Nagoya 464-8603, JapanA ring beam optics was developed for a circular seam welding of the automotive parts using a 2 kW fiber laser. The characteristics of the ring beam optics were investigated by a Primes Beam Monitor. As a result, with increase of focal length of collimating lens, the outer diameter of the ring beam was hardly changed, however the inner diameter of the ring beam decrea...
$25.00
JLA Vol:20 Iss:3 (Design, implementation and testing of a fuzzy control scheme for laser welding)
Authors:
J. M. Jauregui
University of Twente, Laboratory of Mechanical Automation, P.O. Box 217, 7500 AE Enschede, The Netherlands
B. J. Aalderink
Materials Innovation Institute, P.O. Box 217, AE Enschede, The Netherlands
R. G. K. M. Aarts
University of Twente, Laboratory of Mechanical Automation, P.O. Box 217, 7500 AE Enschede, The Netherlands
J. Olde Benneker
Materials Innovation Institute, P.O. Box 217, AE Enschede, The Netherlands
J. Meijer
University of Twente, Laboratory of Mechanical Automation, P.O. Box 217, 7500 AE Enschede, The NetherlandsA fuzzy logic controller (FLC) scheme has been de...
$25.00
JLA Vol:20 Iss:3 (Diode-pumped solid state laser light sources for confocal laser scanning fluorescence microscopy)
Authors:
Mårten Stjernstro¨m
Department of Applied Physics, Royal Institute of Technology, SE-106 91 Stockholm, Sweden and Department of Chemistry, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Fredrik Laurell
Hjalmar Brismar
Department of Applied Physics, Royal Institute of Technology, SE-106 91 Stockholm, SwedenDiode-pumped solid-state lasers (DPSSLs) have been integrated as light sources in confocal laser scanning microscopy (CLSM). The standard argon ion laser at 488 nm is compared with a DPSSL operating at 473 nm in terms of noise and CLSM image characteristics. The equally high fluorescence image quality togeth...
$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, AustraliaWe 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:20 Iss:3 (Low-energy helium-neon laser ensures knee cartilage repair: An experimental short-term assay in rabbits)
Authors:
Maria Stella Peccin
Paulo Ricardo G da Silva
Department of Health Sciences, Federal University of Sa˜o Paulo, UNIFESP, Av. Ana Costa 95, 11060-001 Santos, SP, Brazil
Ana Claudia Muniz Renno
Daniel Araki Ribeiro
Department of Biosciences, Federal University of Sa˜o Paulo, UNIFESP, Av. Ana Costa 95, 11060-001 Santos, SP, BrazilObjectives. The purpose of this study was to evaluate the influence of low-power helium-neon laser on cartilage damage using an experimental short-term assay in rabbits. Material and Methods. A total of 21 adult male New Zealand rabbits underwent bilateral knee cartilage damage usi...
$25.00
JLA Vol:20 Iss:3 (Mechanisms during laser bending)
Authors:
Norbert Pirch
Konrad Wissenbach
Fraunhofer Institut fu¨r Lasertechnik, Steinbachstr. 15, 52074 Aachen, GermanyIn order to investigate the thermomechanical phenomena during the laser bending process, a simulation is performed. The governing thermoelastic-plastic equations are integrated by the finite element method. The results are related to predictions as given by the so-called temperature gradient mechanism (TGM), which is often used in the context of laser bending. It turns out that approximative identical temperature time cycles result in a plane and a prebended sheet in completely different forming behavior, whereby the forming behavior for the bended s...
$25.00
JLA Vol:20 Iss:3 (Review of laser nanomachining)
Authors:
M. Ali
T. Wagner
M. Shakoor
P. A. Molian
Laboratory for Lasers, MEMS and Nanotechnology, Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011Lasers are widely used for macro- and micromachining applications in numerous industries such as automotive, electronics, and medical manufacturing. However, there are many challenges encountered in the utilization of lasers for nanomachining. The most critical requirement is that the diffraction limit of laser light must be overcome. With recent developments in laser technology in terms of short-wavelength and ultrashort pulse width, there is a wealth of opportunities to b...
$25.00