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Violet and Blue Laser Diodes Make Strides
Short-wavelength lasers in the violet and blue spectral range are playing an important role in optical data storage and are receiving much attention in research centers around the world. In 1998, Osram Opto Semiconductors GmbH in Regensburg, Germany, began research on GaN-based blue laser diodes, and shortly thereafter a consortium was formed. Fraunhofer Institute for Applied Solid-State Physics and research groups from the Universities of Braunschweig, Regensburg, Stuttgart and Ulm joined this...
Photonics Spectra, June 2003
Violet Lasers Begin Mass Production in Japan
Nichia and Sony recently announced an agreement for mass production of blue-violet laser diodes for use in optical disc recording and playback. Violet laser development is not new at Nichia Corp. of Tokushima, Japan. In fact, the company is in its...
Photonics Spectra, June 2003
CWDM: A Low-Cost Alternative for Increased Capacity
Cost savings realized in deploying coarse wavelength division multiplexing (CWDM) systems have helped this transport architecture gain acceptance as a viable alternative to dense WDM (DWDM) in short-haul metro-area and enterprise networks. As CWDM...
Photonics Spectra, May 2003
Getting the Most Out of Your Image
For developers of scientific or industrial image-processing applications, robustly and accurately extracting the vital information contained in each pixel presents a constant challenge. Recent developments in camera, frame grabber and algorithm...
Photonics Spectra, May 2003
Getting the Most Out of Your Image
For developers of scientific or industrial image-processing applications, robustly and accurately extracting the vital information contained in each pixel presents a constant challenge. Recent developments in camera, frame grabber and algorithm...
Photonics Spectra, May 2003
In Search of Calcium Fluoride
Anyone who has ever owned a PC is familiar with the problem of technological obsolescence. Faster models hit the market almost before people have had the opportunity to turn on their new computers. What many people don’t know is that rapid...
Photonics Spectra, May 2003
Lasers Play a Bigger Role in Biomedical Applications
The laser is now well-established as a critically enabling tool in biomedical applications that range from research and clinical work at the molecular level to direct human applications for medical conditions such as strokes.These techniques employ...
Photonics Spectra, May 2003
Maximize Color and Contrast in Multimedia Images
After scanning a color photograph into a computer, one assumes it will reproduce well on the screen and on those to which it has been sent via the Internet. The ease with which this can now be done, however, conceals the complexity of the underlying...
Photonics Spectra, May 2003
Never Too Thin
To paraphrase the Duchess of Windsor, displays can never be too thin or too rich. Flat panel displays take up less room and consume less power than their cathode-ray-tube kin. However, in the past, flat panel displays were too expensive and their...
Photonics Spectra, May 2003
Optical Engineering for Beam-Matrix Art
Artistic use of lasers can take various forms. The best-known form is the laser show, which is typically accompanied by music, and uses scanning, diffraction and other effects to project constantly changing patterns on screens or smoke. Another...
Photonics Spectra, May 2003
Taking a Closer Look at Camera Specifications
Purchasing a camera for high-performance imaging applications can be confusing and time-consuming. Manufacturers lack clear and consistently defined specifications, which makes it difficult to compare one camera with another based on specs alone....
Photonics Spectra, May 2003
Getting the Small Picture
Anadigics Inc. of Warren, N.J., is a semiconductor company that helps provide the gift of gab -- and data, too. Its gallium-arsenide integrated circuits are used in both wired and wireless telecommunications systems, and although its products...
Photonics Spectra, April 2003
Illumination Design Gets Faster, Easier
From cell phones to automotive dashboards, illuminated displays have become commonplace. Historically, they were designed with rudimentary software tools, and, consequently, many prototype iterations were required. But in the past decade, the...
Photonics Spectra, April 2003
Illumination Design Gets Faster, Easier
From cell phones to automotive dashboards, illuminated displays have become commonplace. Historically, they were designed with rudimentary software tools, and, consequently, many prototype iterations were required. But in the past decade, the...
Photonics Spectra, April 2003
Infrared Detectors Image the Future
The ability to see beyond the capabilities of normal human vision is vital in areas such as emergency services, defense, science, maintenance and surveillance, and all of these areas stand to gain by the latest advances in infrared imaging...
Photonics Spectra, April 2003
Minimizing Error and Maximizing Precision in Microassembly
Precision assembly solutions are as unique as the products they are built to automate, especially in the photonics world. Progressive assembly operations such as guiding, gluing and bonding sometimes take place in a local region around a static...
Photonics Spectra, April 2003
Picking Up the Pace of Rapid Manufacturing
By one estimate, rapid prototyping equipment generates more than 3 million models and prototypes annually. Even with the recent slowdown in the market, this figure will most likely continue to rise. Development work by equipment manufacturers and...
Photonics Spectra, April 2003
Quartz Crystal Thin-Film Monitoring Forges Ahead
Research in fields such as nanotechnology, biosensors, thin-film displays and high-speed optical communications has increased the complexity of thin-film structures. Although an antireflection coating consisting of a single layer of magnesium...
Photonics Spectra, April 2003
Scrambling to Reduce Polarization-Related Impairments
Polarization is a fundamental property of light. In classical physics, light is modeled as a sinusoidal electromagnetic wave in which an oscillating electric field and an oscillating magnetic field propagate through space. Polarization is defined in...
Photonics Spectra, April 2003
Fiber Bragg Gratings Filter WDM Signals
Fiber Bragg gratings are versatile wavelength filters for multiplexing and demultiplexing wavelength division multiplexing (WDM) signals. They also can compensate for chromatic dispersion that can degrade the quality of the WDM signal in an optical...
Photonics Spectra, March 2003
Making Machines See
Today, machine vision is associated with industrial automation, where vision systems help with the manufacture and inspection of products. Innovations are making machine vision solutions smaller, more powerful, easier to use and less expensive....
Photonics Spectra, March 2003
Modular Diode Lasers Stack Up as Quality Beam Tools
Diode lasers with total power ranging from several hundred watts to more than a kilowatt began to play an important role in materials processing applications in the mid-1990s. The German government recognized that diode lasers could revolutionize...
Photonics Spectra, March 2003
Multiwavelength Lasers Simplify WDM Networks and Applications
Mode-locked lasers are common tools for producing short pulses in the time domain, including telecommunications applications at multigigahertz repetition frequencies that require tunability in the C-band. Now they also can work as multiwavelength...
Photonics Spectra, March 2003
Photonic Component Manufacturers Move Toward Automation
Laser diodes are everywhere. But as the semiconductor laser has evolved to yield a family of robust, reliable devices, manufacturing these devices confronts the existence of multiple proprietary techniques as well as intellectual property...
Photonics Spectra, March 2003
Simulation Tools Assess Laser Communications System Performance
Bidirectional laser communications among ground and air- and spaceborne platforms holds promise of extremely high bandwidth data transfer in commercial and military applications. One challenge still to be met is optical-beam degradation from...
Photonics Spectra, March 2003
(2,924 results found)

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