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Research & Technology News
Tethered AFM Offers Operators More Flexibility
Mar 1, 1999 — A researcher at the National Research Council of Canada has adapted a commercial atomic force microscope (AFM) to perform near-field scanning in a tethered mode. This could have a significant impact on testing photonic devices such as waveguides and ridge diode lasers that do not fit under conventional AFMs. Several years ago, senior scientist Rod Taylor began converting an AFM from Digital Instruments Inc. to use in near-field scanning. Although the concept behind near-field scanning optical...
Thomson Scattering Made Relative
Mar 1, 1999 — In what is being hailed as groundbreaking research that could provide hints about how light and matter interact, physicists at the University of Michigan Center for Ultrafast Optical Science have shown that both the electric and magnetic fields of...
Tuning Diodes
Mar 1, 1999 — A burgeoning fiber optic communications industry is nourishing advances in support devices, not the least of which is the development of tunable laser diodes. Research groups are exploring methods to achieve tunable laser diodes. One group has come...
Uncooled IR Detector Could Enable Cheaper Cameras
Mar 1, 1999 — MSI engineers are working to develop an uncooled infrared detector that will enable the production of inexpensive IR cameras. Such a detector could penetrate such markets as vision assistance systems for automobiles and industrial monitoring...
UV Light Reveals Dinosaur Organs
Mar 1, 1999 — A team of scientists has used UV radiation to examine the internal organs of a baby dinosaur fossil discovered in Italy more than 15 years ago. The fossil was originally found embedded in a limestone formation north of Naples. When it was...
Volcanic Gas Measured at a Safe Distance
Mar 1, 1999 — Volcanic gases offer important clues to atmospheric and subsurface processes, but methods that have proved safe have not proved easy. Scientists using ground-based IR remote-sensing techniques to analyze volcanic plume gases must often contrive...
Altimeter Maps Mars' North Pole
Feb 1, 1999 — The Mars Orbiter Laser Altimeter payload on the Global Surveyor spacecraft has generated the first comprehensive three-dimensional map of the martian north pole. The altimeter's 50-cm-diameter telescope gathered more than 2.5 million laser pulses...
Artificial Tongue Relies on CCD
Feb 1, 1999 — A team of researchers from the University of Texas at Austin has developed a device that mimics the function of the human tongue. The electronic device contains a 3 x 3 array of polyethylene glycol/polystyrene beads bearing chromogenic indicator...
Chemical Sensor Offers Sensitive Real-Time Solution
Feb 1, 1999 — A sensor developed at the Georgia Tech Research Institute could make detection of chemical contaminants highly portable and sensitive, and also enable in situ monitoring of a range of chemicals. It is a planar optical waveguide chip with 13...
Diode Laser Turns up the Power in the Mid-IR
Feb 1, 1999 — Research at Northwestern University has introduced new options for semiconductor lasers operating in the mid- infrared range. Led by professor Manijeh Razeghi, scientists at the university's Center for Quantum Devices have developed high-power...
Disordered Films, Powders Exhibit Lasing Capabilities
Feb 1, 1999 — Semiconductor lasers may be brighter than light-emitting diodes (LEDs), but that advantage certainly comes at a premium. Now researchers at Northwestern University have demonstrated lasing in highly disordered films and powders, a development that...
Gauging Semiconductor Temperature
Feb 1, 1999 — As any good cook knows, a recipe's cooking temperature is critical. For physicists constructing novel semiconductors, knowing the temperature has been a problem. But thanks to a new light-based technique developed at the University of Arkansas,...
Kodak Imaging Sensors Make Second Trip to Mars
Feb 1, 1999 — On the much-publicized Mars Pathfinder mission, Eastman Kodak Co.'s digital imaging technology played an essential role in surveying the landscape of the distant planet. In December, the company's digital imaging sensors were again aboard a NASA...
Laser Lumpectomy Leaves No Scars
Feb 1, 1999 — A new non-invasive technique combining interactive magnetic resonance imaging (MRI) and fiber optic laser delivery has shown promise in locating and ablating cancerous breast tumors. Researchers at the University of Arkansas for Medical Sciences...
Laser Pulses 'Freeze' Energy Flow
Feb 1, 1999 — Scientists at the University of Illinois in Urbana-Champaign may have discovered a way to control chemical reactions using the pulse of a laser, an accomplishment that has eluded researchers for years. The group developed a technique called static...
Laser-Based System Sees Through Walls
Feb 1, 1999 — Anyone who has read the comics knows about Superman's powers, from leaping tall buildings in a single bound to peering through walls with x-ray vision. But seeing through walls may no longer be the stuff of cartoons if a group from Rensselaer...
Method Measures Heat of Thin-Film Semiconductors
Feb 1, 1999 — With their complexity and materials changing, integrated circuits are generating more heat, creating a greater need to monitor that heat to improve efficiency and reliability. Researchers are measuring the thermal properties of various thin-film...
New Coatings Break Reflectivity Barriers
Feb 1, 1999 — Researchers at the Massachusetts Institute of Technology have discovered a class of dielectric coatings that can reflect a broad wavelength regime over a wide angular range. Professor John D. Joannopoulos and his colleagues discovered the reflective...
Scientists Uncover Mysteries of Hydrogen Using Nova
Feb 1, 1999 — Scientists have wondered why Saturn appears younger than the rest of the planets in the solar system. Now they may be closer to understanding the structure and evolution of far-off planets, thanks to Lawrence Livermore National Laboratory's...
Sensor Detects Red Algae Growth
Feb 1, 1999 — What do Hong Kong and Corpus Christi, Texas, have in common? They've both been hit by algae red tides in the last two years. The mysterious bloom of toxic algae pops up in oceans around the world, threatening public health and wreaking economic...
Solid-State Laser Achieves 22 W of Average Output
Feb 1, 1999 — Researchers at Lambda Physik Inc. in Fort Lauderdale, Fla., wanted to design a pulsed Nd:YAG laser system with a high-quality beam, enabling high-efficiency frequency conversion. Recently, they reached their goal, producing a diode-pumped,...
Space Shuttle Launch Recorded Digitally
Feb 1, 1999 — For the first time, NASA has recorded and transmitted a space shuttle launch digitally, according to a release from Force Inc., the company that provided the space agency with its digital video transmission links. Cameras at the transmission...
Synthetic Gemstone May Hold Key to Photonic Crystals
Feb 1, 1999 — Researchers at AlliedSignal Inc. in Morristown, N.J., have found a new use for synthetic opals. In experiments, the researchers introduced carbon into the faux gemstone's lattice. Then they chemically removed the gem, leaving behind a crystalline...
Team Builds More Efficient Quantum Cascade Laser
Feb 1, 1999 — From chemical spectroscopy to free-space optical communications, a growing number of applications can benefit from lasers emitting in the IR between 8 and 12 µm. In recent years, many have looked closely at quantum cascade laser technology for...
Two Associations Recognize Raman's Discovery
Feb 1, 1999 — One of the most popular methods for detecting illegal drugs and unknown substances is Raman spectroscopy. The technique takes advantage of the Raman effect, named after C.V. Raman of Calcutta, India, a professor at Calcutta University who theorized...
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