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Research & Technology News
Laser Ultrasound Evaluates Paper
Jun 1, 2002 — One of the biggest challenges for the paper-making industry is testing the strength and flexibility of paper during production. Engineers must resort to examining samples cut from the ends of completed rolls. Now, engineers from Lawrence Berkeley National Laboratory in Berkeley, Calif., and the Institute of Paper Science and Technology in Atlanta have developed a laser-induced ultrasound system that measures the flexibility of various grades of paper on the fly, in real time. A laser-induced...
Metal Migration Leads to Breakdown of Organic LEDs
Jun 1, 2002 — Using secondary ion mass spectrometry, researchers at the Institute of Materials Research and Engineering in Singapore have found that some organic LEDs degrade because of metal migration at the indium-tin oxide/polymer interface. As reported in...
Microstructures Emit Coherent IR Radiation
Jun 1, 2002 — Thermal sources, such as a blackbody or the incandescent filament in a lightbulb, typically produce broadband, quasi-isotropic radiation. But a team at Centre National de la Recherche Scientifique in Châtenay-Malabry and Bagneux, France, and at...
Monomeric Thin-Film Layers Hold Polar Order
Jun 1, 2002 — Electro-optic modulators along fiber optic lines commonly use LiNbO3 or GaAs waveguides that are expensive and often limit bandwidth to 10 GHz. Using a hybrid covalent/ionic self-assembly process, researchers at Virginia Polytechnic Institute in...
Near-Field Microscope Manipulates Nanometer-Size Particles
Jun 1, 2002 — The use of optical fields to trap and manipulate particles is finding applications from atomic and nonlinear physics to biology. Most of the applications thus far, however, have involved particles no smaller than a micron in diameter. Now...
Optical Trap Produces Degenerate Fermi Gas
Jun 1, 2002 — A group of physicists at Duke University in Durham, N.C., has demonstrated an optical trap capable of creating an arbitrary spin-state degenerate Fermi gas. The work promises to offer researchers cold-gas analogs of high-temperature...
Photonics Probes Hydrogen Exchange
Jun 1, 2002 — Theorists at Durham University in the UK and experimentalists at Stanford University in California have joined forces to investigate the dynamics of the simplest and most studied of bimolecular reactions, the hydrogen-exchange reaction. In this...
Polarization Control Yields Ultrashort Raman Radiation Pulses
Jun 1, 2002 — In many experimental setups, stimulated Raman scattering is an attractive method for laser frequency conversion. However, when the conversion must be done in the femtosecond regime, Raman scattering becomes problematic because other nonlinear...
Sensor Could ID Complex Mixtures
Jun 1, 2002 — According to scientists at the US Department of Energy's Ames Laboratory in Ames, Iowa, back-detection geometry may provide the key to opening up in vivo biological applications for a fluorescence-based chemical sensor. Developed in collaboration...
Single-Chip LED Emits White Light
Jun 1, 2002 — Scientists in Taiwan have developed a white LED that promises to simplify the manufacture of these devices. Rather than optically stimulating a phosphor or mixing the outputs of two or three LEDs of different wavelengths to generate white light,...
VCSELs Pump Photonic Crystal Defect Lasers
Jun 1, 2002 — The potential for low-threshold pump power is one reason why photonic crystal de-fect lasers show promise for high-speed optical-interconnect applications. To validate just how low that threshold can go, scientists at the University of Southern...
VUV Laser Paves the Way for X-Ray Free-Electron Laser
Jun 1, 2002 — After successfully constructing a self-amplification spontaneous-emission, free-electron laser that performs well in the vacuum-UV wavelength band, researchers have set their sights on producing an x-ray free-electron laser with a minimal wavelength...
Water/Propanol Solvent Makes 'Green' Lasers
Jun 1, 2002 — The volatility, flammability and other environmental hazards posed by solvents used in dye lasers, such as methanol and ethanol, have hindered the lasers' use in industrial applications. The refractive properties and benign nature of water would...
Zia Delivers Quantum Dot Samples
Jun 1, 2002 — Zia Laser Inc., a start-up optics company founded a year ago by faculty and former students of the University of New Mexico's Center for High Technology Materials, produced its first round of sample quantum-dot 1550-nm tunable gain chips in...
CARS Limits Background Interference
May 1, 2002 — Coherent anti-Stokes Raman scattering (CARS) microscopy allows viewing of live biological samples -- without photoluminescent labeling or staining -- by using three laser beams to induce electromagnetic vibrational signals from a sample. However, it...
Coastal Imager Provides Linear Results
May 1, 2002 — Tests performed by the Naval Research Laboratory in Washington have found that the Ocean Portable Hyperspectral Imager for Low-Light Spectroscopy produces highly linear spectral and radiometric responses while imaging coastal environments. The...
Doppler Lidar Maps High-Altitude Winds
May 1, 2002 — According to Bob Dylan, the answer is blowing in the wind. That's certainly true for weather prediction, as winds throughout the atmosphere steer weather patterns and are an essential parameter for accurate forecasts. Unfortunately, the information...
InAlGaN Quantum Wells Boost UV Emission
May 1, 2002 — Using InAlGaN-based multiple quantum wells fabricated on SiC, Japanese researchers from Riken in Saitama, Waseda University in Tokyo and Tokyo Institute of Technology in Yokohama have produced high-intensity 300- to 340-nm emissions at room...
Laser Controls Nanoparticle Growth
May 1, 2002 — Spontaneous self-assembly has been a primary approach to the production of nanoparticles. But researchers at Southampton University in the UK and Moscow State University in Russia, led by Southampton physics professor Nikolay I. Zheludev, have found...
Laser Deposits High-k Silicate Films
May 1, 2002 — Researchers at Université du Quebec in Varennes, Canada, hope to enable semiconductor manufacturers to continue reducing the size of integrated circuits. The laser-deposited films of titanium silicate created by the team suggest that an answer to...
Laser Emits Broadband Radiation
May 1, 2002 — Think laser, and odds are that you'll think monochromaticity. A quantum cascade laser developed at Lucent Technologies Inc.'s Bell Labs in Murray Hill, N.J., however, threatens to overturn this "narrow" conception. Quantum cascade lasers are...
Laser Ultrasound Tests Train Tracks
May 1, 2002 — A train accident occurs in the US every 90 minutes, many of which are attributable to undetected cracks in the tracks. Ultrasound techniques are used to test for cracks, but they are limited in application and have difficulties detecting cracks that...
Laser-Ion Interaction Produces Coherent X-Rays
May 1, 2002 — A team at Albert Ludwigs Universität Freiburg in Germany has proposed a means of generating femtosecond pulses of coherent x-rays with wavelengths less than 0.1 nm for chemical and biological imaging. If successful, the technique promises to enable...
Lasers Induce Transformation of Benzene
May 1, 2002 — Multiple 70-mW continuous-wave laser sources have been used by researchers from the Università di Firenze and the European Laboratory for Nonlinear Spectroscopy and INFM, both in Florence, Italy, to induce the chemical transformation of crystalline...
Microscopy Techniques Image Organic LED Bubble Formation
May 1, 2002 — Scientists from the Institute of Materials Research and Engineering in Singapore have examined the formation of dark spots in organic LEDs caused by dome-shaped bubbles at the interface between an emissive and nonemissive diode layer. Using the...
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