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(38,284 articles)
Popular News
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. On a record, spiral grooves with varying depths carry a musical formula. When the disc is played on a turntable, a diamond needle converts the depth of the grooves into sound. Unlike modern vinyl records, however, early records were made of resin or...
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...
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....
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),...
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...
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...
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...
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...
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...
Laser maker aims at paparazzi
Oct 1, 1997 — MARCOUSSIS, France -- While the world's wrath turned on the paparazzi in the wake of the death of Diana, Princess of Wales, one French laser maker has done something about it. Photographers skulking around hotels or lying in wait to ambush...
Researchers Bend X-Rays
Oct 1, 1997 — A pair of Harvard University researchers have discovered a way to manipulate the direction of an x-ray beam, an advance that could someday lead to an improved x-ray laser. Normally, x-rays pass through ordinary optical lenses without bending, but...
Scientists Construct Model to Illustrate Behavior of Optically Excited Materials
Oct 1, 1997 — A group of researchers based at the University of Rochester and led by Shaul Mukamel has developed a set of theoretical models that illustrate how properties of both small and large molecules change when optically excited. Up until this point,...
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...
FTIR Examines Engine Deposits
Oct 1, 1997 — CHESTER, UK -- Collaborators from Queen's University in Kingston, Ontario, Canada, and the Shell Research and Technology Centre Thornton in Chester have combined chemical separation with Fourier transform infrared (FTIR) spectroscopy to examine...
Researchers Grow Ultrapure Crystals in High-Vacuum System
Oct 1, 1997 — Scientists have long known that the fewer impurities there are in a semiconductor material, the faster electrons can travel through it. Impurities act as roadblocks, scattering and reducing their speed. Recently a team of researchers led by Mordehai...
Holographic Reflector Provides Whiter, Brighter LCDs
Oct 1, 1997 — CAMBRIDGE, Mass. -- Scientists at Polaroid Corp. have developed a holographic reflector that promises to make color LCDs whiter and brighter. The secret lies in a transmission hologram that sits behind an LCD and reflects ambient light to produce a...
Sensors Made Light-Sensitive
Oct 1, 1997 — The Consumer Systems Group of the Motorola Semiconductor Products Sector in Chandler, Ariz., and Eastman Kodak in Rochester, N.Y., have developed a tiny filmless camera using Motorola's patented ImageMOS technology. ImageMOS is used to produce...
Los Alamos Researchers Use Protons to Photograph Detonation Waves
Oct 1, 1997 — For the first time, scientists have used a technique known as proton radiography to image a dynamic experiment. Researchers at Los Alamos National Laboratory's Neutron Science Center sent a proton beam from a linear accelerator through a special...
MCI Tests Hitachi Telecom Optical Cross-Connect Systems
Oct 1, 1997 — MCI has begun trials of a system from Hitachi Telecom that enables the complex restoration of high-speed transmission routes on optical networks. The MCI-Hitachi application employs five optical cross-connect systems deployed at various nodes in...
Microwaves Take the Red out of Rubies
Oct 1, 1997 — Researchers at Wayne State University in Detroit have used a magnet and a shower of microwaves to reduce the redness of rubies and increase their transparency. Although the method, called electromagnetically induced transparency, already had proved...
Researchers Demonstrate High-Power, Aluminum-Free Mid-IR Laser
Oct 1, 1997 — Scientists at Northwestern University's Center for Quantum Devices in Evanston, Ill., have demonstrated an aluminum-free diode laser that emits up to 3 W at 3.2 µm. In comparison, similar aluminum-free diode lasers have a maximum output of 100...
NASA Unveils Advanced X-Ray Telescope
Oct 1, 1997 — A team of Eastman Kodak engineers completed its next-generation x-ray telescope for NASA's new Advanced X-Ray Astrophysics Facility. Slated for launch in August 1998, the telescope will be a key component in the space agency's string of space...
NIST Develops Stable Optical Retarder
Oct 1, 1997 — Scientists at the National Institute of Standards and Technology's (NIST) Optoelectronics Div. have developed a stable linear optical retarder for use as a calibration reference. Optical retarders, known as wave plates, are critical for polarization...
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