JLA Vol:9 Iss:3 (A power distribution model of industrial CO<sub>2</sub> lasers for system diagnosis)
Authors:
James G. Katter
Jay F. Tu
Mark GartnerIndustrial lasers are high power pieces of equipment that occasionally function under undesirable operating conditions. For example, the performance of a transverse‐flow d.c.‐excited gas laser can be adversely affected by many factors such as electrode arcing, poor lens and mirror cleanliness, focusing problems, improper gas mixture composition, poor gas quality, poor beam stability, poor beam path cleanliness, operator error, poor maintenance, poor chiller water temperature and flow rate stability, and improper laser beam ramp‐in/ramp‐out rates. Many of these factors which occur in ...
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JLA Vol:4 Iss:1 (Laser Triangulation Range Sensors: A Study of Performance Limitations)
Authors:
Michael Buzinski
Alan Levine
Warren H. Stevenson
Applied Optics Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907Optical triangulation is a very old method of determining absolute distance to an object. In recent years laser range sensors utilizing this principle have seen growing use, particularly in the auto industry. More accurate versions are being employed for dimensional inspection operations where the sensor is often mounted on a coordinate measuring machine. Such a system offers the potential for rapid non‐contact dimensional metrology. However, there are several factors which must be taken int...
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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, JapanPolyperinaphthalene (PPN) nanoparticles are prepared by excimer laser ablation (ELA) of a 3, 4, 9, 10-perylenetetracarbox...
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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 44135This 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:23 Iss:4 (Thermal diffusivity measurement of silver nanofluid by thermal lens technique)
Authors:
Reza Zamiri
Department of Physics, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
B. Z. Azmi
Department of Physics,Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia and Advanced Materials and Nanotechnology Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
E. Shahriari
Kazim Naghavi
E. Saion
Zahid Rizwan
M. S. Husin
Department of Physics, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, MalaysiaThe thermal lens technique was utilized in silver nanofluid containing silver nanopartic...
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JLA Vol:6 Iss:1 (Amending the CDRH performance standard for laser products)
Authors:
Jerome E. Dennis
Office of Compliance and Surveillance Center for Devices and Radiological Heath, US Food and Drug Administration, Silver Springs, MD, U.S.A.The most recent amendments to the Federal performance standard for laser products became effective in 1985 and 1986. At this time, the Center for Devices and Radiological Health (CDRH) is making public its intention to amend the standard again and is inviting suggestions and comments. The amendments that are now under consideration are based upon advances in the sciences of photobiology and hazard evaluation. They are also intended to harmonize with developments in international standards for similar products, and to cla...
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JLA Vol:8 Iss:1 (Laser polarimeters: Overview of recent developments, design and applications)
Authors:
Vi´ctor Fajer Avila
Center for the Development of Scientific Equipment and Instruments, Ministry of Science Techonology and Environment, Havana, CubaResearch carried out in Cuba has led to the design and construction of automatic polarimeters that use the He‐Ne laser as a luminous source and work on a magnetooptic principle of measurement. Physical and chemical investigations including the use of the He‐Ne laser as a light source are discussed. The principle of measurement for the design and construction of polarimeters, resulting in three different types of these instruments, is described. Finally, applications for magnetooptic polarimetry are described,...
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JLA Vol:3 Iss:1 (Laser Welding Copper and Copper Alloys)
Authors:
Kaoru Hashimoto
Takehiko Sato
Koichi Niwa
Fujitsu Laboratories Ltd., 10‐1, Morinosato‐Wakamiya, Atsugi 243‐01, JapanWe have developed a laser hermetic sealing technique that combines nickel plating with laser welding for copper and copper alloy bellows for general purpose large‐scale computers. Laser welding of copper has been difficult because of copper's high thermal conductivity and reflectivity. However, laser welding nickel‐plated copper results in deep penetration. To avoid corrosion induced at the dissimilar metal contact between nickel and copper, the nickel‐plated copper was heat‐treated bef...
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JLA Vol:16 Iss:1 (Laser-induced electrochemical characteristics of aluminum alloy 2024-T3)
Authors:
Olga Kachurina
Tammy L. Metroke
Kai Dou
Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078Laser-induced surface modification of aluminum alloy 2024-T3 was investigated as laser intensity dependence of surface composition and patterning related to electrochemical characteristics using techniques of environmental scanning electron microscopy (ESEM), potentiodynamic scan, and electrochemical impedance spectroscopy (EIS). Analysis of surface composition using ESEM and EIS indicated that laser fluences in a range of 1.1–1.3 J/cm2 were found to preferentially reduce the copper concentration in the alloy surf...
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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 ...
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