JLA Vol:4 Iss:2 (Application of an Excimer Laser Machining Technique in the Construction of an Optical Fiber Bus)

Authors:
Richard J. Coyle
A. J. Serafino
AT&T Bell Laboratories, P.O. Box 900, Princeton, New Jersey 08540

Gary J. Grimes
James R. Bortolini
AT&T Bell Laboratories, 11900 North Pecos Street, Denver, Colorado 80234

An excimer laser technique was developed to machine precision tap openings in a polymer‐clad silica optical fiber for use in the construction of an optical backplane. In this technique, a telescope was used to image the laser beam onto the surface of the fiber at the desired tap location. The cladding then was removed using a prescribed number of pulses from the excimer laser. Single optical fiber taps were cons...

JLA Vol:4 Iss:1 (TEA CO₂ Laser&hyphen;Induced Infrared Multiphoton Dissociation of Zirconium Tetra&hyphen;<em>tert</em>&hyphen;Butoxide: Reaction Mechanism and Dissociation Products)

Authors:
Yoshiki Okada
Shuji Kato
Sakae Satooka
Kazuo Takeuchi
The Institute of Physical and Chemical Research, Wako, Saitama 351&hyphen;01, Japan

Experiments of laser irradiation were performed to investigate the reaction mechanism of TEA CO₂ laser&hyphen;induced dissociation of zirconium tetra&hyphen;tert&hyphen;butoxide (Zr(t&hyphen;OC₄H₉)₄). The chemical structure of the dissociation product was analyzd by fast atom bombardment mass spectrometry (FAB&hyphen;MS), infrared absorption spectroscopy, Raman spectroscopy, and ¹H and ¹³C nuclear magnetic resonance (N...

JLA Vol:4 Iss:1 (Laser Surfacing of High Density Polyethylene for Reduction in Fuel Permeability)

Authors:
W. W. Duley
M. Ogmen
T. Steel
S. Mihailov

The effect of UV and CO₂ laser radiation on the surface of HDPE gas tank material in relation to the permeability of this surface to unleaded gasoline has been investigated. It is found that while excimer (UV) laser radiation has no effect on permeability, CO₂ laser radiation at low intensity modifies the surface so as to reduce permeability over timescales of 1 – 2 days. A possible origin for this modification is suggested.

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 47907

Optical 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&hyphen;contact dimensional metrology. However, there are several factors which must be taken int...

JLA Vol:4 Iss:1 (Laser Safety in Health Care Facilities)

Authors:
Rocco V. Lobraico
Chairman, ANSI Z136.3 Committee

JLA Vol:4 Iss:1 (The Expanding Role of Lasers in Medical Science)

Authors:
David M. Harris
Laser Concepts International, Inc., Glendale, Wisc.

JLA Vol:4 Iss:1 (ANSI Z136.1 Proposed 1992 Changes)

Authors:
R. James Rockwell
Wesley J. Marshall
Myron L. Wolbarsht
David H. Sliney

JLA Vol:4 Iss:1 (The Impact of European Standards, Directives and the CE Mark)

Authors:
A. Roy Henderson
Bioptica, St. John's Innovation Park, Cambridge U.K.

JLA Vol:4 Iss:1 (Combustion&hyphen;Assisted Laser Cutting of a Difficult&hyphen;to&hyphen;Machine Superalloy)

Authors:
P. A. Molian
M. Baldwin

In laser cutting, the largest single application of lasers in manufacturing, the assist gas plays an important role in affecting the cutting performance. The assist gas is usually oxygen or an inert gas. In this work a mixture of acetylene and oxygen was employed to create combustion reactions during CO₂ laser cutting that enabled an improvement in the cutting speed, and cut quality of a difficult&hyphen;to&hyphen;machine superalloy. A comparison with laser cutting of a plain carbon steel under identical conditions was also made to determine the usefulness of combustion energy. Results indicate that both cutting speed and qual...

JLA Vol:3 Iss:3 (Impact of International Laser Safety Standards on Manufacturers. Part II)

Authors:
Robert Weiner
Weiner Associates, Manhattan Beach, CA

Manufacturers have an increasing concern about the need to satisfy different laser safety regulations as they market their products throughout the world. While the national and regional laser safety regulations are similar, the differences which exist do impact the product. The requirements may vary in measurement criteria and limits for classification, engineering features, and manuals and labels, as well as for reporting, testing, and certification. This paper discusses the impact of the primary differing requirements on specific product types and describes the manner in which the laser safety standards are being implemented.