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(9,092 items)
Research & Technology News
Researchers Develop Electro-Optic Lightning Detector
HUNTSVILLE, Ala. -- HUNTSVILLE, Ala. -- Lightning strikes during space launch preparation can be very dangerous. Information provided by detectors can predict a lightning hazard, but time is of the essence. An array of 31 electrometers are in place at Cape Canaveral in Florida that can predict the danger of electric charge buildup during a thunderstorm. But these devices measure current flow from a metal flat-plate antenna to the ground rather than directly measuring electric field intensities. The electric fiel...
Team Produces Tunable Solid-State Blue Laser
Dec 1, 1999 — In a collaboration between the City University of Hong Kong and Shandong University, both in China, scientists have produced tunable, continuous-wave blue light with a solid-state laser. The results of the study, which appeared in the Sept. 27 issue...
This Is Your Garden-Variety Laser
MORIOKA, Japan -- MORIOKA, Japan -- Next time you go shopping for a lasing medium, forget about rubies or sapphires or gases. Just go to the local supermarket and pick up some carrots, potatoes or peppers. Researchers at Iwate University are studying the use of...
Two-in-One Laser
MURRAY HILL, N.J. -- MURRAY HILL, N.J. -- Researchers at Bell Laboratories described in the Oct. 22 issue of Science a semiconductor quantum cascade laser that emits light at 6.33 or 6.5 µm with opposite bias polarities. Bell Labs’ parent company, Lucent...
Blue Laser Diodes Used in Spectroscopy
Nov 1, 1999 — A group at Bonn University in Germany has employed a laser spectrometer based on the InGaN blue laser diodes produced by Nichia Chemical Industries Ltd. in Anan, Japan. The device incorporated a turnkey commercial laser system developed by TuiOptics...
Cold War Images Aid Study of Antarctica
Nov 1, 1999 — The US National Imagery and Mapping Agency has released images taken of Antarctica’s McMurdo Dry Valleys region from spy satellites in 1975 and 1980. Researchers at the US Antarctic Program, an office of the National Science Foundation, will...
Illuminati Ponder the Future of Light
BOSTON -- BOSTON -- More than 200 people convened at Boston University recently to get a perspective on the future of photonics. The event was the third annual Future of Light symposium hosted by the school’s Photonics Center, a resource described by...
In Trace Gas Measurement, Bigger Is Not Better
Nov 1, 1999 — Chemists at the National Institute of Standards and Technology (NIST) in Gaithersburg, Md., have developed a spectroscopy chamber for measuring trace gases that is 100 times more sensitive than previous models. Surprisingly, the new device is also...
Interplanetary Dust Is Deep Space Matter
Nov 1, 1999 — The infrared spectra of interplanetary dust collected in the stratosphere indicate that the particles are similar to the stuff of comets and protostellar clouds, according to an international research team that published its findings in the Sept. 10...
Ion Patterning Yields Distributed Feedback Lasers
Nov 1, 1999 — A research team from the Universität Würzburg in Germany and the Alcatel Corporate Research Center in Marcoussis, France, announced in the Sept. 13 issue of Applied Physics Letters a simplified technique for the production of InP-based...
IR Wavelengths Check Putting Greens
LINCOLN, Neb. -- LINCOLN, Neb. -- Golfers are never short of excuses when it comes to lackluster play, but blaming the greens may soon be a thing of the past. Engineers at the University of Nebraska have designed a device that uses IR wavelengths to determine...
Laser Technique Allows Noiseless Image Amplification
EVANSTON, Ill. -- EVANSTON, Ill. -- Investigators at Northwestern University have demonstrated that it is possible to enhance images of faint objects without introducing graininess. Prem Kumar, a professor in the department of electrical and computer engineering, and...
Laser-Cooling Measures Quantum-Mechanical
Nov 1, 1999 — A team of researchers at Stanford University in California have confirmed that the value of g, acceleration caused by gravity, is constant with respect to mass and size. The physicists employed laser cooling to construct an atom interferometer that...
Lasers Benefit Data Storage, Near-Field Optics
Nov 1, 1999 — According to researchers from Bell Laboratories in Murray Hill, N.J., lasers with a very small aperture promise to advance near-field optics and to enable data storage densities of more than 500 Gb/in.2, or 100 times the current densities. The team...
Maskless Lithography Brings Gene Chips to Labs
Nov 1, 1999 — Scientists at the University of Wisconsin in Madison have developed an etching process for gene chips that eliminates the need for stencillike masks. The technique, dubbed MAS for maskless array synthesizer, promises to allow any laboratory to make...
Optical Vortices May Aid Free-Space Communication
HAIFA, Israel -- HAIFA, Israel -- Researchers at the Technion-Israel Institute of Technology discovered that VCSELs can produce complex patterns of tiny optical vortices, each measuring no more than 2 µm across. Vortices are found throughout nature; optical...
Photonic Bandgap Glass Leads to Novel Optoelectronics
Nov 1, 1999 — Researchers at the US Naval Research Laboratory in Washington reported that they have fabricated photonic bandgap nanochannel glass materials, which they predict will produce optical switches and limiters of higher performance. Armand Rosenberg, a...
Plutonium Smugglers Beware
RICHLAND, Wash. — In an uncertain world, how do you make sure that weapons-grade plutonium is not smuggled across borders? Or that rogue nations are complying with nuclear weapons treaties? Or that nuclear waste is not dumped in an unsuspecting country? Geiger...
Researchers Demonstrate Laser Isotope Separation
Nov 1, 1999 — Researchers from the University of Michigan at Ann Arbor have developed an efficient method of isotope separation using the magnetic fields that are produced within laser-generated plasmas. The technique provides an alternative to the toxic...
Researchers Simulate Fly’s Vision
PASADENA, Calif. -- PASADENA, Calif. -- Insect biologists studying the visual capabilities of flies may find their efforts aided by an innovation developed at the California Institute of Technology. Christof Koch, professor of computation and neural systems, and...
Sensor Fusion Checks Weld Quality
COLUMBUS, Ohio -- COLUMBUS, Ohio -- When it comes to inspecting high-power laser welding, three sensors are better than one, according to engineers at the Edison Welding Institute. They found that optical, acoustic and charged-particle sensors can singly inspect...
Spectroscopy Exposes Molecular Dynamics
OTTAWA — Researchers at the National Research Council’s Steacie Institute for Molecular Sciences have developed a femtosecond-laser-based method to observe coupled electronic rearrangements and atomic motions in molecular processes. The ultrafast...
Synchrotron Improves Calibrations
Nov 1, 1999 — The upgraded synchrotron ultraviolet radiation facility, known as Surf III, at the National Institute of Standards and Technology (NIST) in Gaithersburg, Md., is producing radiation with greater accuracy, purity and power than its predecessor, which...
Technique Aids Testing of Aspheres
SINGAPORE -- SINGAPORE -- Deep aspherical surfaces may become easier to measure, thanks to a novel testing technique developed by researcher Yee-Loy Lam and his colleagues at Nanyang Technological University. Their solution? Immerse the optics in a container of...
Trio Closes In on Remote Chemical Sensor Project
ALBUQUERQUE, N.M. — A collaboration among Sandia National Laboratories, the Massachusetts Institute of Technology in Cambridge and the Honeywell Technology Center in Minneapolis promises to produce a functioning prototype remote sensor by 2001 that will allow a person...
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July 2024
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