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Steward Observatory Spins Out Major Mirrors
Tucson, at first, seems a remote spot for the world’s foremost optical sciences laboratory. Arising from the parched red crust of the Arizona landscape, manicured lawns and English gardens betray an extensive field of subterranean aquifers similar to those that planetologists hope to discover on Mars. The comparison is not inappropriate. In the outlying regions of the city, the tracts of homes and businesses quickly give way to an unearthly terrain of jagged rock, cracked and worn by...
Photonics Spectra, July 2002
Tactical Airborne Reconnaissance Goes Dual-Band and Beyond
The military action following the events of Sept. 11 has put intelligence, surveillance and reconnaissance in the spotlight. It has highlighted the need to persistently monitor a battlefield to determine exactly who and what are there. Terrorists...
Photonics Spectra, July 2002
Does Your CCD Camera Need Cooling?
To those in the light-starved world of astronomy, the result of cooling cameras to ultralow temperatures is obvious: Truly amazing images can be produced in situations where only a few photons are available. The need for cooling may not be so...
Photonics Spectra, June 2002
Marking Glass
In any manufacturing process, information about the creation and nature of the product is critical to optimizing the process. Permanent, unambiguous symbols such as part or serial numbers save time, facilitate in-process testing and reduce mistakes....
Photonics Spectra, June 2002
Photonic Crystals
Photonic bandgap crystals serve as a microcosm of the photonics industry: Although microscopic in structure, their versatility in manipulating photons could have a huge and pervasive impact on nearly all optical components and instrumentation,...
Photonics Spectra, June 2002
Broadband Spectrophotometry
Designing devices that incorporate ultrathin films is an important means of enhancing yields. However, characterizing ultrathin films can be extremely challenging for mainstream metrology tools such as ellipsometers, interferometers and...
Photonics Spectra, May 2002
Diode-Pumped Solid-State Lasers
They slice, they dice, they weld. Diode-pumped solid-state lasers offer an ever-increasing degree of processing flexibility and beam quality. These factors alone continue to strengthen their position in industrial applications ranging from...
Photonics Spectra, May 2002
Microdisplays, Macro-Impact
Despite their name, microdisplays are making a big impact, and it’s getting bigger. The size of a computer chip, a microdisplay employs photonics technology to create a magnified image large enough to fill a movie screen or a home theater, or...
Photonics Spectra, May 2002
Modeling Telecommunications Components
The term "crosstalk" describes the phenomenon of power leaking from one channel of a wavelength division multiplexing (WDM) system into a neighboring one. One of the most important design issues for optical communications systems, crosstalk can...
Photonics Spectra, May 2002
Not All Multiplexing Technologies Are on the Same Wavelength
Until recently, the development of dense wavelength division multiplexing (DWDM) technology has focused solely on scaling to higher channel counts, following pundits’ predictions that future high-bandwidth applications would create a bandwidth...
Photonics Spectra, May 2002
Assessing Damage for UV-Laser-Resistant Fused Silica
The heart of any optical lithography tool is its illumination and projection system. The illumination system preconditions the laser beam and provides the optical path from the laser to the photomask, and the projection lens images the pattern from...
Photonics Spectra, April 2002
Lasers Lighten the Laboratory Load
Laser manufacturers take note: A nonscientific survey indicates that scientists want a highly tunable turnkey laser with configurable pulse widths and repetition rates. It should be easily mode-locked, have good shot-to-shot and long-term stability,...
Photonics Spectra, April 2002
Machine Vision
Thanks to LEDs and off-the-shelf CCD camera technology, robots can now insert automotive windshields on the fly as a car moves along the production line. The first such application in the world is Ford Fiesta and Mazda 121 assembly lines at a Ford...
Photonics Spectra, April 2002
Optical Fiber
At the beginning of 2001, manufacturers of optical fiber couldn’t make the stuff fast enough. By midyear, the economic boom’s bubble had burst, and the world’s leading suppliers began applying the brakes to their global fiber...
Photonics Spectra, April 2002
Optical Power Meters
Despite the downturn in the telecommunications industry, traffic volume continues to grow. Network providers will need additional capacity, and equipment designers must continue to push system limits toward higher bit rates and denser channel...
Photonics Spectra, April 2002
Polyphenyl Ethers
These short-chain cyclic compounds are linked by oxygen atoms. A characteristic formulation has two to eight aromatic groups, or rings, allowing PPEs to retain their chemical and performance stability against ionizing radiation, thermal excursions,...
Photonics Spectra, April 2002
The Incredible Shrinking IR Camera
Many interesting and important IR imaging applications remain limited by the practical and economic barriers of camera technology; namely, camera size, weight and power consumption. A typical example is in fire fighting, where ideally every...
Photonics Spectra, April 2002
Automated Pigtail Fabrication Needed for Future Networks
The need to automate the manufacture of fiber optic components is clear. Automation must be embraced if the industry is to fuel the expansion and urban deployment of next-generation networks. The question is how best to implement automation in the...
Photonics Spectra, March 2002
Automating Optoelectronics Manufacturing
The financial situation confronting the optical networking industry is placing new demands on the companies that supply it with advanced optoelectronic components. Because of the recent slowdown in spending, carriers are looking for ways to maximize...
Photonics Spectra, March 2002
Choosing a Scientific CCD Detector for Spectroscopy
Since the invention of the charge-coupled device by Willard Boyle and George Smith at Bell Labs in 1970, there has been an explosion in its use in scientific, medical and industrial imaging, and in spectroscopy applications.CCDs represented a...
Photonics Spectra, March 2002
Cutting Manufacturing Costs
With increasing market pressure to make significant reductions in the cost of manufacturing photonic components, engineers are turning more and more to new design approaches, higher levels of device integration and the extensive use of automation...
Photonics Spectra, March 2002
Excimers Smooth the Path to Well-Lubricated Bearings
Applications in the defense and aerospace industries have increased demands for spherical plain bearings that require less maintenance and that yield higher performance and longer life. These demands, in turn, have initiated the development of laser...
Photonics Spectra, March 2002
Specifying Injection-Molded Plastic Optics
The use of plastic optics continues to grow in popularity as optical design engineers discover the many ways these components can manage light. Plastic optical elements and systems appear in a wide spectrum of industrial and medical applications,...
Photonics Spectra, March 2002
Beam Profiling Aids Fiber Optics Manufacturing
In the fiber optics industry, one constantly hears that new markets will remain elusive unless production efficiency is improved. It is a common goal, therefore, to develop better processes. We propose beam profiling as a scalable improvement for...
Photonics Spectra, February 2002
Broadband Gain Chips
Telecommunications requirements such as dynamic provisioning, channel protection, wavelength conversion and the replacement of fixed-wavelength distributed feedback lasers are driving the adoption of tunable laser sources. External-cavity lasers...
Photonics Spectra, February 2002
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