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Research & Technology News
Thomson and Oxford Unveil Fingerprint ID System on a Chip
Dec 1, 1997 — Set for release early next year, the chip uses thermal imaging to capture an image of a person's finger. The image data is then reconstructed by a Thomson algorithm, and the fingerprint is verified. Unlike other fingerprint verification systems, the silicon chip measures only 2 3 17 mm.
Xerox Makes Colorful Splash with Blue Diode Laser
Dec 1, 1997 — PALO ALTO, Calif. -- A small -- a very small -- spot of color here and there is behind Xerox's development of a blue laser diode. Xerox hopes to use the nitride-based semiconductor technology to create a new line of high-resolution printers. Like...
A Photonics-First Sheds Light on Global Warming
Nov 1, 1997 — GREENBELT, Md. -- A spaceborne photonic combination could help knock some of the guesswork out of studying global warming and its relationship to aircraft. Scientists know that cirrus clouds hold IR radiation in the atmosphere, raising the Earth's...
Boom! From Light Comes Matter
Nov 1, 1997 — PALO ALTO, Calif. -- In Physics 101, our instructors drilled us on the Law of Matter Conservation: "Thou shalt not create matter from nothing." However, a team of 20 physicists/lawbreakers has done just that, by converting light into matter. The...
Chilly Weather Poses Problems for Fiber Optic Cables
Nov 1, 1997 — Cold weather has proven troublesome for fiber optic cable performance, often changing the internal geometry of the fiber. Scientists from Bellcore in San Diego have monitored the problem during the past several years, subjecting fiber optic cable to...
CO2 Laser Beam Propels Miniature Rocket
Nov 1, 1997 — The Advanced Space Transportation Program has launched a miniature rocket propelled by a ground-based laser beam. Scientists at White Sands Missile Range in New Mexico aimed a 10-kW pulsed CO2 laser at the launch vehicle, raising it seven feet off...
Femtosecond Experts: Fast Is Fun
Nov 1, 1997 — Research at the very edge of the time scale for laser pulses is becoming more exciting, according to two ultrafast-laser experts who shared the Schawlow Prize (and lecture) at the American Physical Society's Interdisciplinary Laser Science...
Fiber Advance Eases Splicing
Nov 1, 1997 — CORNING, N.Y. -- In a move that should improve splicing efficiency and lower system installation costs, Corning Incorporated has tweaked its production process for single-mode fiber and tightened its core/clad concentricity specs by 25 percent....
Gallium-Arsenide Solar Cell Proves Twice as Efficient as Silicon
Nov 1, 1997 — Spectrolab Inc., a unit of Hughes Electronics Corp. of Los Angeles, has developed a gallium-arsenide solar cell that converts almost twice as much of the sun's energy as traditional silicon cells found on spacecraft solar-array panels. The solar...
IR Modeling Proves the Sun's in Hot Water
Nov 1, 1997 — WATERLOO, Ontario, Canada -- By comparing the infrared spectra of sunspots and a simulation of infrared spectra of very hot water, scientists have confirmed that very hot water does indeed exist in sunspots. Fiery eruptions on the sun, captured by...
Laser Neural Network Acts as Computer
Nov 1, 1997 — EINDHOVEN, Netherlands -- An optical processing network that uses the effect of external feedback on the output of a laser diode to control processor responses could prove to be the harbinger of the elusive optical computer. The researchers seek to...
Naval Research Laboratory Scientists Unveil Fiber Optic Beamformer
Nov 1, 1997 — Naval Research Laboratory scientists have developed a beamformer for time-delay steering of a two-dimensional transmitter array. The beamformer is located on a phased array antenna, which resembles a small satellite dish, and distributes microwave...
Optical Fibers Restore Old Records
Nov 1, 1997 — LAUSANNE, Switzerland -- A group of scientists at the Federal Institute of Technology's (EPFL) metrology lab has designed an optical stylus that can play old 78-rpm records that are too fragile or damaged to be played on a traditional record player....
Optical Ultrasound Smooths Rough Spots
Nov 1, 1997 — ORSAY, France -- Industries use ultrasound in quality assurance and materials analysis, and a new optical technique may simplify the process for many applications. Noninvasive ultrasound techniques solve problems in the aerospace and automotive...
Photonics Gives New Life to Old Tune
Nov 1, 1997 — BUENA PARK, Calif. -- The player pianos that were so popular in the early part of this century are making a comeback -- this time with a high-tech twist. Although computerized player pianos that store live performances and play them back note for...
Physicists See Green, Discover Atom's Nucleus Emits Visible Light
Nov 1, 1997 — Atoms routinely emit light when electrons surrounding the nucleus jump to a lower energy level. Energy levels in the nucleus also vary, sometimes by as much as thousands or millions of electron volts. When an excited nucleus relaxes, it usually...
Polarized Light Makes Special Glass Grow
Nov 1, 1997 — CAMBRIDGE, UK -- Science has pursued organic polymers in the quest for light-powered, nano-size switches, motors and pumps. Now, researchers at the University of Cambridge have developed an inorganic glass that expands and contracts in response to...
Researchers Bring Trace Gases to Light
Nov 1, 1997 — A researcher from the University of Leeds in northern England has designed a system that detects trace gases such as methane and other hydrocarbons in the Earth's atmosphere. The system, dubbed FAGE (fluorescence assay by gas expansion),...
Sensors' New Clothes Enhance Efficiency
Nov 1, 1997 — ALBUQUERQUE, N.M. -- A new coating for chemical sensors promises to increase their sensitivity by a factor of 500. The porous coating, developed at Sandia National Laboratories, is less than 1 µm thick, but its extremely high surface area makes...
University of Vermont Incorporates Sensors in State Bridges
Nov 1, 1997 — To monitor the structural health of Vermont's aging bridges, the University of Vermont in Burlington has spearheaded a campaign to equip some bridges with an array of different optical sensors. Campaign to equip some bridges with an array of...
US Navy Uses Acousto-Optic Device to Detect Chemicals
Nov 1, 1997 — An acousto-optic tunable filter instrument worked comparably to a CCD-based monochromator for a recent chemical warfare detection test, according to US military researchers. K. Ewing of the Naval Research Laboratory in Washington explained during a...
Widely Tunable Diode-Pumped Laser Is on the Horizon
Nov 1, 1997 — A group of Lawrence Livermore National Laboratory scientists in Livermore, Calif., has conducted research that could lead to the development of a widely tunable diode-pumped solid-state laser for medical laser systems. The group fabricated...
Cameras Play Traffic Cop
Oct 1, 1997 — TWINSBURG, Ohio -- The next generation of traffic control systems, employing the latest in video imaging and detection, should be operational in a suburb of Akron by midsummer of next year. Unlike traditional stoplights, this "intelligent...
Femtosecond laser offers big benefits
Oct 1, 1997 — NEW ORLEANS -- Picking cotton has gone high-tech, and soon photonics will help processors pick nothing but the best. Scientists at the US Department of Agriculture's Southern Regional Research Center have developed a system that uses near-infrared...
Femtosecond laser offers big benefits
Oct 1, 1997 — CAMBRIDGE, Mass. -- A group of Harvard University researchers has demonstrated a technique for blasting miniature holes in transparent materials that could mean big advances in a number of photonic applications. Though in its initial stages, the...
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