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Research & Technology News

Polarization Rotator Puts New Spin on Fiber Bottlenecks
May 1, 2000 — Researchers at AT&T Labs of Red Bank, N.J., have demonstrated a free-space micromachined polarization rotator that they believe could solve speed limitations caused by polarization mode dispersion in vintage fiber networks. At the Optical Fiber Communications Conference in Baltimore, they proposed that a combination of these devices could remove polarization-mode-dispersion-related speed bottlenecks in long-haul communications networks. The polarization rotator comprises four movable mic...
Researchers Probe for Good Vibrations
MADISON, Wis. -- MADISON, Wis. -- Researchers at the University of Wisconsin-Madison have found that if one laser beam is a good research tool, two are even better. Working together, two infrared lasers can probe relationships between molecular vibrational states...
Satellite-Based Lidar May Help the Weatherman
MOUNT WASHINGTON, N.H. -- MOUNT WASHINGTON, N.H. -- Sending balloons into the upper atmosphere to get weather readings is decades-old technology. A team of researchers is working to improve weather forecasting with the development of a satellite-based laser system for...
Scientists Resolve Ionization Debate
FRANKFURT, Germany -- FRANKFURT, Germany -- Since 1983, physicists have argued over how intense laser beams can multiply ionized atoms. Three paradigms competed to fill the theoretical void. Now the work of two independent teams in Germany seems to have put the issue to...
Sensitization Produces High-Efficiency Organic LEDs
PRINCETON, N.J. -- PRINCETON, N.J. -- Organic LEDs promise much to the commercial display industry -- cool, low-voltage operation, smaller pixels, low cost -- but manufacturing difficulties and efficiency problems have prevented them from penetrating the market. A...
Smaller Chips See Larger Markets
May 1, 2000 — New complementary metal oxide semiconductor technology from Philips Semiconductor of Eindhoven, the Netherlands, is under development for low-cost video imaging applications. The company says its proprietary SeeMOS technology enables the production...
Acousto-Optics Detects Fluorescence
CHARLOTTESVILLE, Va. -- CHARLOTTESVILLE, Va. -- Capillary electrophoresis is fast becoming the preferred method for the separation of DNA, proteins and other molecules -- especially as it is performed on multichannel microchips. To induce fluorescence in these samples, a...
Acousto-Optics Detects Fluorescence
STUTTGART, Germany -- STUTTGART, Germany -- A team of physicists at the University of Stuttgart has captured time-resolved images of collapsing microbubbles in water. The researchers used a sensitive, high-speed streak camera to study the dynamics of the light and shock...
Advantages of Two-Photon Imaging
BUFFALO, N.Y. -- BUFFALO, N.Y. -- During the past decade, photon scanning tunneling microscopy has achieved resolution better than 100 nm, overcoming the optical diffraction limits. Recently, scientists at the State University of New York at Buffalo developed a...
Approaching Continuous X-ray Laser
BELLATERRA, Spain -- BELLATERRA, Spain -- A team of physicists led by Ramón Corbalán at the Universitat Autònoma de Barcelona has developed a theoretical model that promises to meet one of the great challenges of modern physics: continuous emission...
Autonomous Robot Finds Meteorites
PITTSBURGH -- PITTSBURGH -- A four-wheeled robot named Nomad recently made history in Antarctica by autonomously searching for and classifying meteorites. The expedition was a collaboration between researchers at Carnegie Mellon University’s Robotics...
Corning and Gore Test Prototype Fiber
Apr 1, 2000 — Researchers from Corning Inc. of Corning, N.Y., and W.L. Gore & Associates Inc. of Newark, Del., have successfully tested Corning’s prototype InfiniCor fiber using Gore’s 850-nm vertical-cavity surface-emitting lasers. The fiber,...
Doping Leads to More Efficient Film
Apr 1, 2000 — A team from the Université Paris-Sud in Orsay, France, and Agfa-Gevaert NV in Mortsel, Belgium, has reported that formate ions enhance the efficiency of silver halide crystals nearly to their theoretical limit. The development, which, unlike...
Engineering Academy Names Century’s Top Achievements
Apr 1, 2000 — On behalf of the National Academy of Engineering, astronaut Neil Armstrong announced the most important engineering achievements of the 20th century at a National Press Club luncheon celebrating National Engineers Week 2000. From 105 achievements...
Epichem Produces Mid-IR Laser Diodes and LEDs
Apr 1, 2000 — Wirral, UK-based Epichem Ltd. has announced that it has fabricated mid-IR LEDs and laser diodes with its Admiral Consortium partners Aixtron AG, RWTH Aachen, Université Montpellier II and the IP-Czech Academy of Science. The Sb-based devices...
Far-Side Observation Predicts Solar Storms
Apr 1, 2000 — Astrophysicists from Solar Physics Research Corp. in Tucson, Ariz., and NorthWest Research Associates in Boulder, Colo., have developed a technique that may enable scientists to forecast solar storms more than a week in advance. Reporting in the...
IR Telescope Planned for Paranal
Apr 1, 2000 — The UK Visible and Infrared Survey Telescope project announced that it hopes to install a wide-angle telescope for the European Southern Observatory’s Very Large Telescope at Paranal Observatory in Chile. The 4-m survey telescope will be...
Lab Produces Record Crystal
Apr 1, 2000 — In support of the National Ignition Facility at Lawrence Livermore National Laboratory in Livermore, Calif., the lab’s researchers have produced a huge rapid-growth crystal. The 701-lb KDP crystal was grown in 52 days using an improved...
Lasers Continue Across Nuclear Fission Threshold
DIDCOT, UK -- DIDCOT, UK -- Scientists at the Rutherford Appleton Laboratory have demonstrated that today’s powerful lasers can replace nuclear accelerators in some experimental studies of nuclear and plasma physics. Along with more general experiments,...
MCI WorldCom Tests Optical Network
Apr 1, 2000 — The OPTera 1600G optical amplification system and OPTera LH platform from Nortel Networks, headquartered in Brampton, Ontario, Canada, were put through their paces in a commercial live trial by MCI WorldCom on a span linking Dallas and Longview,...
Nanostructures Produce Tuned IR Emitters
Apr 1, 2000 — Lithographically defined nanostructures may enable the production of tuned infrared "sensorchips" for gas analysis, say researchers from Ion Optics Inc. of Waltham, Mass., and NASA’s Jet Propulsion Laboratory in Pasadena, Calif. The team...
Nitres Reports High-Efficiency LEDs
Apr 1, 2000 — Researchers from Nitres Inc. of Westlake Village, Calif., have announced that they have developed an InGaN-based LED with a quantum efficiency of 20 percent. The near-UV/violet diode displays 405-nm emission, and has an output of 12 mW at 20 mA and...
Quantum Database Speeds Searches
Apr 1, 2000 — A potential advantage of storing information in the quantum phase of atoms is the speed of data retrieval. Theorists proposed in 1997 that a search algorithm could locate data in an N-state system in (root of)N steps, rather than N/2 steps under...
Quantum Dots Aim to Be Smart Pixels
SANTA BARBARA, Calif. -- SANTA BARBARA, Calif. -- Scientists at the University of California reported the development of a “smart pixel” device based on quantum dots that can collect, store and retrieve optical information in a single efficient unit. Optical...
Quantum-Well Lasers are Suited to Trace Analysis
Apr 1, 2000 — A team from Université Montpellier II in Montpellier, France, Laboratoire Central de Recherche in Orsay, France, and Université Ibnou Zohr in Agadir, Morocco, have described the production of high-temperature quantum-well lasers that...

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