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Research & Technology News
Ringdown Caught with Single Shot
Apr 1, 2002 — A team from Los Gatos Research in Mountain View, Calif., has developed a modified version of ringdown spectroscopy that obtains information about a trace molecule's absorption spectrum over a large optical bandwidth with a single laser shot. Ringdown spectroscopy measures the life-time of a photon in an optical cavity to determine the total intracavity loss, which can be used to derive a substance's absolute absorption intensities. Most methods extract decay times by repeatedly scanning...
Ruthenium-Doped Nanotubes Fluoresce
Apr 1, 2002 — Using a chemical vapor-deposition technique, a research team from Pennsylvania State University in University Park and the Center for Applied Energy Research in Lexington, Ky., has fabricated ruthenium-doped multiwall carbon nanotubes that...
Unmanned-Aircraft Sensor Could Detect Cave Dwellers
Apr 1, 2002 — A sensor suite designed for unmanned aircraft promises sensitivity and resolution high enough to detect human activity in caves. The proposed Airborne Infrared Surveillance sensor would consist of three acquisition and three tracking cameras, along...
Welding System Monitors Gas Shield
Apr 1, 2002 — Although laser welding is widely used in manufacturing, it has not yet found a home in the aerospace industry. The technique would be an attractive tool in this sector if its reliability could be improved, but aerospace alloys present problems that...
'Slow Light' May Enable Benchtop Black Holes
Mar 1, 2002 — Ulf Leonhardt of St. Andrews University in St. Andrews, UK, hopes to bring black holes -- or, at least, an optical analog of their event horizons -- to the lab. In the Jan. 24 issue of Nature, he describes how the manipulation of an...
0.1-Hz Detector Could Measure Cosmic Acceleration
Mar 1, 2002 — We are on the cusp of the gravity-wave revolution in astronomy. Numerous detectors -- powered by bars of metal or by beams of light, on the ground or in orbit -- are scheduled to come online over the next 10 years or are awaiting approval to do so,...
Bright White Organic LED Developed
Mar 1, 2002 — Using precisely calibrated thicknesses of bright blue, red and green light-emit-ting layers, researchers at Academia Sinica's Institute of Chemistry in Taipei, Taiwan, have developed a bright white organic LED that produces an intensity of 24,700...
Coupled-Resonator VCSEL Produces High Output
Mar 1, 2002 — Researchers from the Sandia National Laboratories' Center for Compound Semiconductor Science and Technology in Albuquerque, N.M., have constructed a monolithic coupled-resonator vertical-cavity laser that produces up to 6.1 mW of output in...
Digital Camera Tracks Eye Location
Mar 1, 2002 — Researchers at the Institute of Information Science of Academia Sinica and National Taiwan University, both in Taipei, have developed a system that adjusts stereoscopic images on a monitor to the position of the viewer's eyes, thus eliminating the...
Dressing Particles Takes Time
Mar 1, 2002 — Physicists have typically assumed that a free charged particle introduced into a nonequilibrium Coulomb system instantaneously becomes a "dressed" particle, completely integrated into the system. However, researchers from Technische Universität...
Electrostatic Monolayering Produces Controlled Refractive Indices
Mar 1, 2002 — Researchers from the Universidad Publica de Navarra in Spain and from Virginia Polytechnic Institute and NanoSonic Inc., both in Blacksburg, have shown that an electrostatic self-assembled monolayer process can create multilayered thin-film...
Holographic Optical Memory Estimate Lower Than Predicted
Mar 1, 2002 — A new mathematical method of determining the theoretical storage capacity of volume holographic memory systems has revealed an estimation two orders of magnitude lower than the previously predicted terabit-per-centimeter cube. Designed by Adil...
Hybrid Microscopy Images Calcium
Mar 1, 2002 — By combining two-photon-excitation and third-harmonic-generation microscopy, researchers at Centre National de la Recherche Scientifique in Talence and Bordeaux, France, have produced images that correlate cell processes with cell...
Infrared Spectrometer Filter Is Electrically Tunable
Mar 1, 2002 — Portable infrared spectrometers enable in situ analysis of compounds in a variety of hazardous environments on Earth and in space. Such possibilities have led researchers at Ryukoku University in Otsu, Japan, to develop a small, robust infrared...
Interferometer Yields Large Gratings
Mar 1, 2002 — A European research team has demonstrated a low-cost solution to the manufacture of large diffraction gratings using a variant of an interferometer developed more than a decade ago. The work promises to yield better gratings for chirped pulse...
Lasers Add Lines to Capillary Electrophoresis
Mar 1, 2002 — Laser-induced native fluorescence detection in capillary electrophoresis has opened new applications and areas of research, but the technology has been forced to rely on either mainframe lasers or frequency-doubled Ar-ion or Kr-ion lasers. Although...
Liquid Crystal Films Controlled with Viruses
Mar 1, 2002 — A virus is going around the laboratory of Angela Belcher, a chemist at the University of Texas in Austin who has discovered that the microscopic organisms can be manipulated to organize the optical particles in a liquid crystalline film. The...
Lithium Lens Focuses X-Rays
Mar 1, 2002 — With a little extra care, researchers at the University of Michigan in Ann Arbor, Ecopulse Inc. in Springfield, Va., and the US Army Research Laboratory in Adelphi, Md., have expanded the materials from which a lens can be made. The team has...
Model Identifies Limits on Filters
Mar 1, 2002 — Fiber optic cables carrying multiple channels of light rely on a number of precision devices, including tunable narrow-bandwidth filters. But the process of manufacturing such filters is tricky and prone to defects. Now researchers have developed a...
Near-Field Microscopy Catches Smallest Laser in Action
Mar 1, 2002 — Using a near-field scanning optical microscope, researchers at the University of California in Berkeley have captured images of tiny nanowire lasers in action. Led by Richard Saykally, they have applied a combination of femtosecond spectroscopy and...
Phase-Shifting Interferometry Measures Surfaces
Mar 1, 2002 — There are no good vibrations when it comes to precise surface measurements. Mirrors, for instance, are often manufactured to specifications of fractions of a wavelength, and that requires surface measurement resolutions of better than 100 nm....
Plasma Spectroscopy Monitors Welds
Mar 1, 2002 — Researchers from Università degli Studie Politecnico di Bari and from Istituto Nazionale per la Fisica della Materia, both in Bari, Italy, have developed a nonintrusive sensor system to monitor laser welding in real time. By spectroscopically...
Silicon on Sapphire Speeds Chip Communication
Mar 1, 2002 — The insulating properties of sapphire have been heralded as a boon to smaller, low-power chip design, but researchers at Johns Hopkins University in Baltimore are focusing on the gem's optical potential for laser chip communication at speeds a...
Spectroscopy Probes Attosecond World
Mar 1, 2002 — Researchers have probed the microworld with femtosecond spectroscopy, enabling them to investigate nuclear motion at its 10- to 20-fs timescale. Now a team from Technische Universität Wien in Vienna, Austria, Steacie Institute of Molecular Sciences...
Straightness of Pipes Gauged Online
Mar 1, 2002 — A machine vision system that uses a pair of line-structured lasers and two CCD cameras could improve the speed and accuracy of inspecting the straightness of seamless steel pipes. One of the last steps in pipe production involves taping the ends,...
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July 2024
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