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(38,290 articles)
Popular News
Free-Electron Laser Emits in the Far-Infrared
Aug 1, 1999 — Scientists have sought a convenient source of radiation in the far-infrared portion of the spectrum for the study of semiconductor nanostructures and constituents in the atmosphere. In an effort to achieve that, researchers from Dartmouth College in Hanover, N.H., have built a compact, low-power free-electron laser that generates tunable coherent beams from 10 µm to 1 mm. They modified a scanning electron microscope to send a beam of electrons across a metal diffraction grating so that...
Telescope Puts the Universe in Focus
Aug 1, 1999 — In June, astronomers gave the public a glimpse of some of the sharpest IR images ever obtained by a ground-based telescope. The images from the Gemini North Observatory on the island of Hawaii show the power of the new telescope, which minimizes the...
US, Japan Track Ghostly Neutrinos
Aug 1, 1999 — Since the first neutrinos were detected more than four decades ago, researchers have sought better ways of detecting these elusive, high-energy particles that originate from nuclear reactors and outer space. Japan and the US have teamed up to...
Laser Sharpens Grinding Wheels
NAGAOKA, Japan — Advances in the electronics industry have led to the development of new materials, such as Al2O3-TiC magnetic heads and special glasses for hard disks and liquid crystal screens. However, these materials are difficult to machine, requiring diamond...
Near-IR Technique Sheds Light on Kinetic Reactions
Aug 1, 1999 — Chemists at Marquette University in Milwaukee have used a multispectral imaging spectrometer constructed with an acousto-optic filter and an InGaAs focal plane array to study the kinetics of curing an epoxy resin. The researchers’ results...
Lidar Detects Traces of Ethane in the Atmosphere
Aug 1, 1999 — Laser Exploration Inc. in Midland, Texas, reported that, in a field test of its lidar system, it had identified seeping hydrocarbon gas, presumably from underground deposits. Using a Raman-shifted chromium LISAF infrared laser made by Ophir Corp. in...
Microscope Records Chemical Makeup
MARTINSRIED, Germany -- MARTINSRIED, Germany -- Researchers at Max Planck Institut fur Biochemie have combined the atomic force microscope’s ability to define surface features with the infrared absorption techniques of spectroscopy to record chemical composition....
Nitrogen Splits GaInAs Conduction Band
Aug 1, 1999 — Researchers at the Lawrence Berkeley National Laboratory reported that the presence of a nitrogen band formed a few tenths of an electron volt above the lowest energy conduction band in a gallium indium arsenide alloy material. Although the addition...
Organic LEDs May Improve Microdisplays
Aug 1, 1999 — Organic light-emitting diodes (LED) offer several key advantages over conventional LEDs. Their high efficiency and resolution make them well-suited for integration on silicon integrated circuits and high-performance microdisplay systems. Fed Corp....
Fiber Optic Data System Debuts on Raytheon Plane
Aug 1, 1999 — The flight data recorder aboard commercial airliners often yields important clues about the last moments before a crash. But the traditional shielded, twisted wiring used to collect parameters from remote sensors lacks sufficient sensitivity....
Sapphire Probe Offers Wide Dynamic Range
Aug 1, 1999 — Fiber optic temperature sensors offer wide dynamic range, immunity to electromagnetic interference and high sensitivity. They are typically used for measuring temperatures in applications such as plasma deposition. A sapphire-fiber thermometer with...
Lens and Scanner Are Fabricated on a Single Crystal
Aug 1, 1999 — The angular position and the spot size of a laser beam -- important to applications such as optical data storage, laser printing and head-up display technology -- traditionally have had to be controlled using separate elements for focusing and...
Optical Coherence Tomography Expands Its Scope
Aug 1, 1999 — Optical coherence tomography, recognized in biomedical circles as an excellent imaging method, is expanding its field of view into materials applications, most recently the nondestructive imaging of composites. Optical coherence tomography...
Researchers Achieve Higher Bandwidth over Single-Mode Fiber
Aug 1, 1999 — A technology that would improve the transmission capacity of wavelength division multiplexing (WDM) systems on standard single-mode fiber may affect the majority of installed fiber networks. Researchers from Pirelli Cables and Systems of Milan,...
New Findings on Single-Shot Laser Pulse Damage
Aug 1, 1999 — Laser damage on short time scales is an area of active research. Because short pulses produce damage with a smaller statistical uncertainty than long pulses, femtosecond lasers for submicron-precision material removal have become attractive....
Copper Vapor Laser Clears Skin Vessels
MOSCOW -- MOSCOW -- The Center for Laser and Plastic Surgery, in conjunction with the P.N. Lebedev Physical Institute, has reported excellent results from the use of copper vapor lasers in the treatment of telangiectasias -- abnormal dilated capillary vessels...
Solvents Polish Porous Silicon’s Efficiency
MALVERN, UK -- MALVERN, UK -- With regard to porous silicon, efficiency applies both to the material’s light-emissive qualities and to its cost-performance ratio. But until recently, stability has not been among the material’s strong points (Photonics...
Near-IR Lasers Spot Mold in Soya Beans
Aug 1, 1999 — Soya beans are one of the most popular foods in Japan. But each year a small portion of the crop is infested with green, white or brown mold. Most factories use random sampling to detect spoiled beans, while others use visible spectroscopy or...
Glass Fiber Could Aid Laser Surgery
Aug 1, 1999 — A hollow glass fiber promises improved performance for next-generation IR sensors and fiber delivery systems used in laser surgery. James Harrington, a professor of ceramic and materials engineering at Rutgers University in New Brunswick, N.J.,...
Lidar System Finds Fault with Trees
DENVER -- DENVER -- Would that Washington state geologists had it as easy as their counterparts in California, where faults, such as the San Andreas, show up in aerial photography as long, deep furrows in the Earth’s brow. But geologists can’t see...
Galileo Pares Business Lines
Aug 1, 1999 — Electronic tube maker Burle Industries Inc. of Lancaster, Pa., has purchased Galileo Corp.’s scientific detector and spectroscopy products business. That includes single-channel and microchannel detectors, fiber optic lightguides and remote...
Laser 99 Attracts Global Interest
Aug 1, 1999 — Visitors from 61 countries descended on the New Munich Trade Fair Center in June to take in the technology of tomorrow. Promoters described Laser 99, held in Munich, Germany, as the "most international" laser congress to date, and exhibitors...
Lucent Acquires SpecTran
Aug 1, 1999 — Telecommunications giant Lucent Technologies of Murray Hill, N.J., has agreed to purchase specialty optical fiber manufacturer SpecTran Corp. Terms of the deal include a cash transaction of $64 million, or $9 a share, plus the assumption of $35...
Construction Begins on Pan-European Fiber Optic Network
Aug 1, 1999 — London-based i-21 Future Communication has begun building what it says will be Europe’s largest and most ambitious broadband network. Planning to "go live" next May and to have 90 percent of the coverage available by the end of 2000, the...
Optical Networking System Transmits Data Through the Air
Aug 1, 1999 — Lucent Technologies has unveiled an optical networking system that transmits voice, data or video signals through the air. The WaveStar OpticAir uses IR lasers, amplifiers and receivers placed on rooftops or office windows to transmit voice, data or...
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