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Research & Technology News
Bolometer Array Suitable for 350-µm Astronomy
Dec 1, 2001 — Researchers at the Jet Propulsion Laboratory and California Institute of Technology in Pasadena, Lawrence Berkeley National Laboratory in Berkeley, Calif., University of Colorado in Boulder and Cardiff University in the UK have developed a micromesh bolometer array for spaceborne astrophysics at 350 µm. The detectors, which they reported in the Oct. 1 issue of Applied Optics, display a dark-noise-equivalent power of 2.9 x 10-17 W/√Hz and a 1.3-pJ/K mean heat capacity at 390 mK. The...
Engineering Emmys Presented
Dec 1, 2001 — The National Academy of Television Arts and Sciences of New York recognized scientific accomplishments in the television industry at a ceremony Oct. 16, awarding 25 Emmys for Outstanding Achievement in Engineering Development. Photonics and related...
FTIR Spectroscopy Detects Biohazards
Dec 1, 2001 — With the recent anthrax attacks in the US, finding a means of detecting airborne biological agents from a safe distance has become all the more important. Fourier transform infrared (FTIR) spectroscopy may be a solution, suggests a new study. A...
Laser Spectroscopy Refines Antiparticle Measurement
Dec 1, 2001 — The existence of the antiproton was predicted in 1930 and confirmed experimentally in 1955. These particles, however, can be produced only in high-energy accelerators, and their short lifetime prevents a detailed examination. By studying how...
Lidar Demonstrates Feature Discrimination
Dec 1, 2001 — Scientists use remote-sensing techniques to characterize landform variation, to evaluate the health of vegetation and to measure the temperature of the oceans. But while in the visible to the infrared offers valuable information, the ambient light...
Light-Reactive Coating Cleans Surfaces
Dec 1, 2001 — If you shine ultraviolet light on a surface coated with titanium dioxide, a common white pigment in paint, it self-sterilizes and defogs. Until now, however, if you used visible light, only approximately 5 percent of which is in the UV region, it...
Machine Vision Has Eyes for Foul Fowl
Dec 1, 2001 — With the rising concern over cholesterol, the demand for chicken now outpaces the demand for beef in the American diet. Pressured to keep pace, the poultry industry automated many of its processing techniques by the late 1970s. Inspection, however,...
Mobile System Features Three Mass Spectrometry Techniques
Dec 1, 2001 — There are few chemical species that cannot be identified through one or another of mass spectrometry's myriad forms. However, chemists must select which spectrometric method best applies, based on the targeted species and the method of sample...
Multispectral Imaging Monitors Coral
Dec 1, 2001 — A study appearing in the Sept. 6 issue of Nature concludes that airborne multispectral imaging may be a powerful tool for monitoring the health of coral reefs. Researchers on the project from Newcastle upon Tyne University and Sheffield University,...
Nd:LuYLF Generates 4.5-ps Pulses
Dec 1, 2001 — Solid-state lasers based on Nd:LuLF offer a wider spectral emission than those based on Nd:YLF, making them suitable for ultrashort-pulse operation, but LuLF is a much more expensive crystal to produce. Researchers at Centro de Lasers e Aplicações...
Nd:YAG Produces 53-mJ Green Light
Dec 1, 2001 — It may not be easy being green, but researchers at Mitsubishi Electric Corp.'s Advanced Technology R&D Center based in Amagasaki, Japan, have made the most of it. They have produced 53 mJ from a diode-pumped, intracavity frequency-doubled Nd:YAG...
Optical Digital Signal Processor Boosts Speeds
Dec 1, 2001 — A new approach to signal processing promises to reduce bottlenecks in telecommunications networks. Lenslet Labs Ltd. of Ramat-Gan, Israel, has developed an optical digital signal processor that operates thousands of times faster than today's...
Optical System Enables 2-D Scanning
Dec 1, 2001 — In pursuit of new e-book technology, researchers have designed a novel optical system that scans in two dimensions. Although developed for a display in a portable document reader, the designers say that the lens system can be used for any...
Photoinduced Reflectivity Creates Near-Field Probes
Dec 1, 2001 — Transient-aperture probes generated with light promise high resolutions and near-video rates for near-field infrared microscopy. The technique, under development at the W.W. Hansen Experimental Physics Laboratory at Stanford University in Stanford,...
Plasma Displays 0.12% Conversion Efficiency
Dec 1, 2001 — Laser-induced plasmas have emerged as potential sources of soft x-rays and extreme-UV light for applications in spectroscopy, microscopy and lithography. Now researchers at Max Born Institute for Nonlinear Optics and Spectroscopy in Berlin and at...
Quantum-Dot Detector Spots Submillimeter-Wave Photons
Dec 1, 2001 — Doubling up can single out photons. A new submillimeter-wave detector promises the sensitivity to spot single photons. In contrast to existing single-photon-detection schemes, the detector does not require a magnetic field, and it offers an expanded...
Recordable CDs Are Source of Gold Substrates
Dec 1, 2001 — Hua-Zhong Yu isn't burning mixes of MP3s from Napster with his stacks of recordable CDs. An assistant professor in the department of chemistry at Simon Fraser University in Burnaby, British Columbia, Canada, Yu is investigating recordable CDs as a...
Researchers Demonstrate Macroscopic Entanglement
Dec 1, 2001 — With one experiment, researchers have heartened Star Trek fans and quantum computing enthusiasts. A team at the University of Aarhus' Quantum Optics Center in Denmark has demonstrated quantum entanglement involving trillions of atoms over a distance...
Simple Bulk Optic Offers Simple Beam Control
Dec 1, 2001 — Bulk solid optics have helped circumvent the need to align multiple free-space optics within communications systems by substituting multiple mountings of discrete optical components with a single integrated optical unit. The same goal spurred...
Spectra Determine Fruit Ripeness
Dec 1, 2001 — If you have ever bought the "perfect" piece of fruit from the grocery store only to have it rot the next day, you know how tough it can be to find fruit that is ripe enough to eat -- but not overripe. Research being conducted at the University of...
Ultrafast Setup Machines and Measures
Dec 1, 2001 — Researchers at the University of Aarhus in Denmark have developed laser techniques for manufacturing and measuring on the microscopic scale. The method uses the same femtosecond laser pulses to ablate material and to profile depths on the...
Unmanned Vehicles Fly by Light
Dec 1, 2001 — By exploiting quantum mechanics, researchers at the Naval Research Laboratory in Washington have used free-space optics to communicate with unmanned aerial vehicles. The technique promises to allow data transfer and the control of fist-size fliers...
Xenon Source Offers Hemispheric Emission
Dec 1, 2001 — A team at the University of Central Florida in Orlando has demonstrated a differential-pumping scheme for a xenon capillary-discharge plasma source that enables the device to produce 11.3- and 13.5-nm light in a full hemisphere. The previous...
100-km Negative-Dispersion Fiber Carries 10 Gb/s
Nov 1, 2001 — To satisfy consumer demand for higher bandwidth in metropolitan-area networks, wavelength division multiplexing (WDM) systems must include economical, application-optimized components. Researchers have reported a new fiber with negative dispersion...
Brittle Star Features Calcite Lenses
Nov 1, 2001 — It has five arms and thousands of eyes, wears an armored plate and has been around for 500 million years. No, it's not a monster from a 1950s grade-Z sci-fi movie, but the brittle star Ophiocoma wendtii. And it may lead researchers to develop new...
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July 2024
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