JLA Vol:3 Iss:3 (Treating Birthmarks With Diabetes)

Authors:
Myron L. Wolbarsht
Psychology Department, Duke University

JLA Vol:3 Iss:3 (Safety of Medical Excimer Lasers with an Emphasis on Compressed Gases)

Authors:
David H. Sliney
Laser Microwave Division, US Army Environmental Hygiene Agency, Aberdeen Proving Ground, MD 21010‐5422

Terrance N. Clapham
VISX, Inc., 919 Kifer Road, Santa Clara, CA 94086

Excimer lasers which emit short ultraviolet radiation (UVR) are currently being used in experimental and developmental surgical applications. Although UVR exposure is possible, it is not normal in laser angioplasty (cardiovascular surgery) and is insignificant in photokera‐toplasty (ophthalmic surgery). However, significant potential hazards exist with the use of excimer laser gases such as fluorine and HCI. Stringent safeguards for handling and use are ...

JLA Vol:3 Iss:3 (Cooperative R&D Project: Laser Biomedical Subsurface Imaging)

Authors:
Leon Goldman
J. H. Kerr
Department of Dermatology, Naval Hospital, San Diego, California 92134‐5000

With the experience of the U.S. Navy in photon transmission through turbid media, a cooperative research and development project has been initiated for laser subsurface imaging. This concerns laser expertise, laser institutes, and consultants. The initial technologies considered at present are laser transmission with chromophores, including photodynamic therapy, spectroscopy, biomedical optical phase conjugation, pulsed thermal radiometry of Nelson, digital ultrasound with hopeful laser additive imagery, and MRI with holography and radiowaves. Laser transil...

JLA Vol:3 Iss:3 (Comparison of the CDRH and IEC Standards for Laser Products. Part I)

Authors:
Jerome E. Dennis
Center for Devices and Radiological Health, Food and Drug Administration, Rockville, Maryland

David H. Edmunds
Xerox Corporation, Webster, New York

JLA Vol:3 Iss:2 (Mo Conductor Forming Technique with Laser Chemical Vapor Deposition (CVD))

Authors:
Shyuzo Sano
Mikio Hongo
Katsuro Mizukoshi
Takashi Kamimura
Production Engineering Research Laboratory, Hitachi, Ltd., Japan

A reduction in resistivity and an improvement in reliability of Mo conductors formed by laser CVD from Mo(CO)₆ gas have been achieved using laser annealing. By establishing a standard of 10 μ Ω • cm, the reduction in resistivity was analyzed by AES (Auger Electron Spectrometry) and XRD (X‐ray Diffractometry) methods. Reliability has been confirmed by the stability of resistance when subjected to a heat cycle of −50 – 150°C for more than 70 times.

JLA Vol:3 Iss:2 (Precision Limits of the Estimation of the Parameters of Fo¨rster Models of Fluorescence Waveforms)

Authors:
L. Jonathan Dowell
Los Alamos National Laboratory, Los Alamos, NM 87545

The author examined the precision of maximum‐likelihood‐derived, nonlinear least‐squared‐error algorithms that are suitable for laboratory implementation and that estimate the parameters of Fo¨rster models of fluorescence. The estimation precision for these parameters is limited by inherent noise in the fluorescence‐waveform measurement. This paper examines the Fo¨rster model and its recent applications and discusses parameter estimations for models of energy transfer by different wavefunction interactions. It presents the results of Monte Carlo simulation studi...

JLA Vol:3 Iss:2 (Laser Applications in Criminalistics)

Authors:
E. R. Menzel
Center for Forensic Studies, Department of Physics, Texas Tech University, Lubbock, Texas 79409

Lasers find application in numerous areas of criminalistics, such as fiber analysis, document examination and serology. Their widest use, however, is in detection of latent fingerprints. Several routine procedures for obtaining laser‐excited fingerprint fluorescence on a range of surfaces have been developed. However, many surfaces fluoresce so strongly themselves that they are not amenable to these procedures. Time‐resolved luminescence imaging is being investigated to permit detection of fingerprints on such surfaces.

JLA Vol:2 Iss:3 (Energy Coupling in Surface Treatment Processes)

Authors:
Friedrich Dausinger
Markus Beck
Jae H. Lee
Eckhard Meiners
Thomas Rudlaff
Jialin Shen
Institut fu¨r Strahlwerkzeuge, University of Stuttgart, Federal Republic of Germany

In cutting or welding processes with lasers, deep penetration mechanisms allow high energy coupling rates. In surface treatment processes such as martensitic hardening, cladding and alloying, deep penetration of the laser beam is mostly not applicable. This generally leads to insufficient coupling rates. In this contribution several ways of enhancing the coupling rate are summarized. Following some theoretical considerations, results of exp...

JLA Vol:3 Iss:1 (Developments in Medical Applications)

Authors:

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

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