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Research & Technology News
Diode Laser Simultaneously Emits at Three Wavelengths
Jan 1, 1999 — Federico Capasso and a team of researchers at Bell Labs have demonstrated a semiconductor laser that simultaneously emits at three wavelengths in the IR. Such a laser may find applications in spectroscopic analysis of trace gases in the atmosphere for environmental monitoring and industrial process control. For years, researchers have investigated the prospect of creating a diode laser that emits at well-separated wavelengths at the same time. Superlattice crystals After attempts to create a...
Dye Improves Efficiency of Organic LEDs
Jan 1, 1999 — A team of researchers from Princeton University in New Jersey has improved the efficiency of electroluminescent organic light-emitting diodes (LEDs) by introducing a fluorescent dye. Fluorescence emissions occur when electrons become excited,...
Electrode Improves CCD Sensitivity
Jan 1, 1999 — Eastman Kodak Co. has developed a technology that increases the sensitivity of its charge-coupled device (CCD) image sensors in the blue and green regions of the spectrum. By incorporating a transparent electrode into its existing technology, the...
Flat Photomultiplier Tube Peeks out of the Lab
Jan 1, 1999 — Hamamatsu K.K. in Japan recently unveiled a showstopper commercial product for the new millennium: a flat panel photomultiplier tube. The revelation was one of several "Future R&D Plans" announced during the company's Photon Fair, a three-day...
Imaging Spectrometer Improves Auroral Understanding
Jan 1, 1999 — Researchers at the University of Illinois are taking a fresh look at auroras. They have developed an imaging spectrometer that allows them to study auroral emissions as a function of altitude, offering them more clues about the effects of the solar...
Optical System Speeds Automatic Target Recognition
Jan 1, 1999 — Hoping to overcome the limitations previously associated with automated target recognition, Litton Data Systems has developed a miniature optical correlator that could boost the processing speed of these systems tenfold. Although the project has...
Researchers Alter Rare-Earth Metals
Jan 1, 1999 — Researchers from Vrije University have created an optical method of monitoring the hydrogen navigation that makes an yttrium film switch from reflective to transparent. The method should simplify work for other researchers seeking materials for...
Researchers Introduce Fluorescent Chemical Weapons Detector
Jan 1, 1999 — Chemists at the University of Maryland in College Park have developed a method for detecting lethal chemical weapons in a system that uses molecules that fluoresce in the presence of a small amount of phosphate esters. Many current detectors are...
Researchers Report Findings on Trapping and Cooling Molecules
Jan 1, 1999 — Researchers have long been interested in the ability to trap and cool molecules to facilitate improvements in ultracold molecular physics and in molecular spectroscopy. Scientists use methods such as laser cooling and cryogenic surface...
Sensors Detect Biological Weapons
Jan 1, 1999 — Scientists at the Naval Research Laboratory have developed a lightweight, fully automatic biological weapons detection system that one day may find its way to the battlefield. The system, which researchers have tested mounted in an airplane, uses...
System Measures Efficiency of Solar Cells
Jan 1, 1999 — Physicists at the Netherlands Energy Research Foundation have developed a technique to measure imperfections in solar cells. That information points the way to more efficient and cost-effective solar cells. As light strikes a solar cell, it produces...
University Unveils Sensitive Microscope for Chip Inspection
Jan 1, 1999 — A technician at Heriot-Watt University in Edinburgh, UK, has built a microscope powerful enough to monitor the inner workings of semiconductor chips. Lynn Edwards, in collaboration with Gerald S. Buller, a researcher at the university,...
UV Lasers Stop People in Their Tracks
Jan 1, 1999 — Mork from Ork could freeze people in midaction with a simple point of his alien finger -- diminishing them to dancing, talking, running statues. Now researchers at HSV Technologies Inc. have come up with a device that could put this power into the...
WDM Enables High-Capacity System
Jan 1, 1999 — Alcatel Optronics has demonstrated the simultaneous transmission of more than 15 million voice circuits on a four-fiber- pair system that uses wavelength division multiplexing. It expects the advance will provide a fourfold increase in the capacity...
Zeiss to Build Ring Laser Gyroscope
Jan 1, 1999 — The Federal Cartography and Geodesy Office in Frankfurt, Germany, has commissioned Carl Zeiss Inc. in Oberkochen to design and manufacture a laser gyroscope that will measure the Earth's rotation. Engineers will install the gyroscope in three years...
40-Gb/s Soliton Transmission Achieved in Field Experiment
Dec 1, 1998 — Scientists led by Chalmers University of Technology professor Peter Andrekson have achieved a 40-Gb/s soliton pulse transmission over a 400-km distance on commercial dispersion-shifted fiber optic cable. The researchers describe their success as the...
CO2 Laser Optically Pumps Semiconductor Laser Prototype
Dec 1, 1998 — The CO2 laser, commonly recognized as an industrial workhorse, is not high on the list of potential optical pumping devices, at least not for quantum-well unipolar lasers. But optical pumping a new semiconductor laser is exactly the function of a...
Detector Helps Crash Investigation
Dec 1, 1998 — Following the Sept. 2 crash of Swissair Flight 111 just off Nova Scotia, Canadian aviation investigators immediately turned to sonar imaging systems to highlight areas that might contain crash debris. The sonar images indicated large areas of dense...
Diamond Cools Diode Lasers
Dec 1, 1998 — As the saying goes, diamonds are a laser's best friend -- or something like that. Diamond is a material known to spread heat effectively, with low electrical conductivity. The importance of this precious material is growing further because...
Hubble Telescope Provides Rare View of Distant Galaxies
Dec 1, 1998 — VXcientists recently got their first glimpse of the oldest, most distant galaxies in the universe from images sent back from the Hubble Space Telescope. A sensitive IR camera detected the faint glow of galaxies estimated to be 95 percent of the way...
Interferometer Lights Path in Search for Distant Planets
Dec 1, 1998 — Scientists at the University of Arizona's Steward Observatory have demonstrated principles that could allow the direct detection of Earth-like planets around distant stars. The 10-µm emission of a gas cloud around Betelgeuse becomes visible...
Laser Interactions Create Powerful Magnetic Fields
Dec 1, 1998 — Intense laser pulses, which possess strong magnetic and electric fields, can force the electrons in a plasma to oscillate dramatically. It is this unique interaction, which also produces very high current electron jets, that has fascinated...
Light Activates Protein Scissors
Dec 1, 1998 — A light-activated reagent that can bind to protein molecules and then sever them when irradiated by a 344-nm light could offer microbiologists a versatile tool for exploring the structure and behavior of proteins. Scientists could use this tool to...
Nanoshocks Reveal Molecular Behavior
Dec 1, 1998 — What is the first step in an explosion? In energetic materials, the question focuses on the dynamics of molecular behavior. Empirically, we know that we can break bonds and make energy, but how does this violent process start? At the University of...
New Telescope Makes the Stars Wheelchair-Accessible
Dec 1, 1998 — In the summer of 1995 the University of Illinois made many of its campus facilities wheelchair-accessible, including the observatory on the roof of the library. It wasn't until a year later, however, that wheelchair-bound visitors could participate...
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