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Lasers Features
Lasers Are Fit for Print
Violet lasers and new printing plate materials are the hottest technologies for printing and reprographics, but photonics manufacturers are also providing innovation in infrared laser technology, keeping customer options open. The principal and somewhat unexpected cause of the interest in visible laser technology is the availability of 5-mW violet laser diodes (390 to 420 nm) from Nichia Corp. and violet-sensitive plates from three manufacturers. Several plate-setter manufacturers used this ...
Photonics Spectra, September 2000
Tunable Lasers Hit the Right Note for DWDM
A key technology for meeting the exploding demand for ever-more bandwidth in communications networks is dense wavelength division multiplexing (DWDM), which allows multiple colors of traffic-carrying light to be sent down a single fiber. DWDM...
Photonics Spectra, September 2000
Ion Lasers:
When diode-pumped solid-state lasers first appeared in the marketplace during the early 1990s, argon-ion, helium-neon and other classic laboratory lasers seemed doomed. The newer technology was more compact and rugged, allowing researchers freedom...
Photonics Spectra, July 2000
Big Hopes for Small Lasers
The growth in telecommunications, data storage and data processing is driving fiber optic data communications to progress at a breathtaking rate. At the "edge" of the network, outside the dense wavelength division multiplexed long-haul core, is the...
Photonics Spectra, May 2000
Photonics in: Medicine
Photonics plays a key role in medicine and health care. Lasers, with their precise targeting of tissues and locations, have found a home in many areas of surgery. Digital images and their transmission and display are critical in diagnostic...
Photonics Spectra, May 2000
Extreme Photonics: Ultrafast Lasers
The 1999 Nobel Prize in chemistry rewarded not only Ahmed Zewail’s pioneering work on ultrafast spectroscopy and femtochemistry, but also the entire field of ultrafast optics and femtosecond laser applications. In the last decade, pulse...
Photonics Spectra, February 2000
Lasers Squeeze into Tighter Board Assemblies
Though not the first choice for every application, the electronics industry will continue to rely more on lasers to drill, solder and trim its ever-shrinking products. The pressure is on in the electronics game, and photonics is stepping up to the...
Photonics Spectra, July 1999
Can Lasers Teach Bullets to ’Squeal’?
Often at the scene of a shooting, investigators have little evidence to work with. The shooter usually runs away with the gun, leaving behind little more than a couple of spent shell casings. Scratches and marks on a shell casing can tie it to a...
Photonics Spectra, May 1999
Lessons from the Battlefield: Technology Transfer Cuts Both Ways
As an industry, photonics can testify to the value of technology transferred out of the military. Charge-coupled devices, diode lasers and infrared imaging all owe much of their early development to defense basic research fueled by the Cold War and...
Photonics Spectra, April 1999
Lasers in the Chemistry Lab
Physicists may explore the fundamental interactions between light and matter, but in the chemistry lab these interactions get put to work. The intense monochromatic light from lasers has found application in both physical and analytical chemistry....
Photonics Spectra, March 1999
Laser Chillers:
Some like it hot. Even some lasers don't mind the heat as much as others. But the laser user that disregards thermal management altogether is asking for trouble. Laser users might not put a whole lot of thought into cooling their systems, relying on...
Photonics Spectra, February 1999
Telecommunication Systems Minimize Laser Risks
The rapid development and implementation of optical telecommunication technology have significantly aided the growth of Information Technology in the 1990s. Ready access to the Internet and the decreasing cost of telephone calls, both nationally and...
Photonics Spectra, February 1999
Wavelength Lockers Keep Lasers in Line
Dense wavelength division multiplexing (WDM) transmission systems have taken on a level of sophistication never before seen in the telecom industry. Wavelength spacings of 100 GHz (0.8 nm) and 50 GHz (0.4 nm) are challenging system manufacturers to...
Photonics Spectra, February 1999
F2 Lasers:
Excimer lasers working at 308, 248 and 193Ynm are well-established tools for high-precision micromachining. However, some new applications are demanding even higher resolution or higher photon energies. One solution that keeps them in the optical...
Photonics Spectra, January 1999
Telecommunications Needs Drive Laser Improvements
This year, dense wavelength division multiplexed (DWDM) systems will expand from typical networks of 16 2.5-Gb/s channels to those with 80 or more 2.5-Gb/s channels, or up 40 10-Gb/s channels. This expansion will drive an increase in laser power for...
Photonics Spectra, January 1999
Tunable Diode Lasers Stand Up to Research and Commercial Applications
Tunable external-cavity diode lasers have become more reliable since their introduction five years ago. Now, more demanding telecommunications, spectroscopy and metrology applications are driving improvements in specifications for the next...
Photonics Spectra, January 1999
Nd:YAG Lasers:
The Nd:YAG laser crystal was developed in the 1960s, not long after the discovery of the ruby laser. Its combination of high gain, narrow linewidth, low threshold and physical properties makes it a very versatile laser material and a variety of...
Photonics Spectra, November 1998
Laser Safety:
Injuries from lasers are nothing new. Every year since the laser's invention more than 30 years ago, laser technicians, research assistants, seasoned laser engineers and Ph.D. physicists get hurt using these powerful tools. Eye injuries are the most...
Photonics Spectra, October 1998
X-Ray Lasers:
Since the demonstration of the first visible lasers in the 1960s, the prospect of a tabletop x-ray laser has intrigued chemists and biologists alike. Such a laser might finally unlock the many secrets of what goes on within cells or provide...
Photonics Spectra, September 1998
Aesthetic Surgery:
Compared with other surgical cosmetic procedures, lasers are less invasive and enable faster recovery and often superior results. While the cost of a laser-based procedure is often higher than other methods, it has flourished in plastic surgery,...
Photonics Spectra, August 1998
Solid-State Lasers Join the Space Race
In the 60s and 70s, scientists had carte blanche to develop space instruments. However, in todayis cost-conscious space programs, laser designers look towards Earth and improving commercial technologies to meet cost guidelines and accomplish mission...
Photonics Spectra, June 1998
Blue Lasers Meet Tough Commercial Requirements
Light-emitting diodes (LEDs) and laser diodes with wavelengths below the red ( Gallium nitride and other III-V nitride-based semiconductors have a direct band gap that is suitable for blue light-emitting devices. The band gap energy of aluminum...
Photonics Spectra, May 1998
Modular Lasers Improve Amplifier Testing
The commercial availability of erbium-doped fiber amplifiers has fueled the explosive growth of dense wavelength division multiplexing optical networks. These multiplexed optical systems in turn place great demands on amplifier performance. This...
Photonics Spectra, May 1998
World's Largest Laser Shoots Photonics to a New Level
It's been called the most ambitious laser project ever, a nuclear weapon deterrence insurance policy, a portal into the heart of a star and a source for inexhaustible energy. Under construction at Lawrence Livermore National Laboratory, the National...
Photonics Spectra, May 1998
Are We On Exactly The Same Wavelength?
If you have been using lasers for more than a few years, you can recall the days when the wavelength specified on a commercial diode laser was a rough estimate rather than a precise figure. As recently as the early 1990s, it was not unusual to buy...
Photonics Spectra, March 1998
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