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(9,092 items)
Research & Technology News
Six-Band Sensor Put Through Its Paces
Jan 1, 2001 — The Japan Defense Agency in Tokyo has completed a study of a multispectral sensor for airborne surveillance. The sensor, which the team described in the October 2000 issue of Optical Engineering, features off-axis three-mirror reflective optics. Dichroic mirrors split incoming light into three visible and three IR bands. A linear array constructed of two 5000-element CCDs monitors the visible wavelengths from 400 to 760 nm and the near-IR from 800 to 920 nm. Linear arrays of HgCdTe monitor the...
Thermal Lasers May Upset Offset Printing
BEDFORD, Mass. -- BEDFORD, Mass. -- A printing press is the single largest capital investment of a newspaper or a printing house, and press time is precious. The owner loses money every minute that the press is down, such as when the aluminum printing plates are...
Tunable IR Quantum Cascade Laser Demonstrated
Jan 1, 2001 — A team at the Technical University of Vienna in Austria announced that it has constructed tunable distributed-feedback quantum cascade lasers with a peak emission at 9.35 µm. The surface-emitting devices may find applications in chemical...
Welding Suited to Shipbuilding
Jan 1, 2001 — Current welding methods distort the structural steel plates used for shipbuilding, requiring manufacturers to invest time and money in postprocessing. The shipbuilding industry would like to take advantage of the speed and economy of laser welding,...
Alcatel Breaks 5-Tb/s Transmission
Dec 1, 2000 — Alcatel of Paris has demonstrated 5.12-Tb/s transmission over 300 km of its TeraLight optical fiber. Such a transmission capacity would enable more than 100 million voice calls or 640,000 high-speed Internet connections to be carried over a single...
Camera’s Exposures Always Correct
NEW YORK -- NEW YORK -- The human eyeball can handle an enormous range of brightness levels. It can look at a darkly tanned person sitting on the brilliant white sand of a beach in glaring midday sunlight and correctly distinguish that person’s features,...
Dielectric Waveguide Betters Fiber
CAMBRIDGE, Mass. -- CAMBRIDGE, Mass. -- Building on its wide-bandwidth, wide-angle, high-reflectivity dielectric mirror, a research team at Massachusetts Institute of Technology has designed a dielectric waveguide with several advantages over optical fiber. It will be...
Dispersion Increases Fiber Capacity
HOLMDEL, N.J. -- HOLMDEL, N.J. -- A researcher at Lucent Technologies Inc.’s Bell Labs has taken a working solution to a wireless communications problem and applied it to optical communication over multimode fiber. Although still in the early stages of...
Excimer Laser Processes Ceramic Spinnerettes
MÜNSTER, Germany -- MÜNSTER, Germany -- A new procedure that employs an excimer laser emitting at 248 nm shows promise for the fabrication of ceramic spinnerettes. Spinnerettes are small nozzles typically made of a metal alloy that are used in the production of...
Fiber Probe Enhances Plasma Spectroscopy
MUNICH, Germany -- MUNICH, Germany -- Monitoring the exhaust plumes from industrial activities such as power generation may soon be faster and more accurate. Researchers at Munich Technical University are testing a rugged fiber optic probe that can be placed inside an...
Flexible Laser Produced
MUNICH, Germany -- MUNICH, Germany -- Scientists from Ludwig Maximilians Universi-tät, the Fraunhofer Institut für Solare Energiesysteme in Freiburg and the Max Planck Institut für Polymerforschung in Mainz, all in Germany, have developed a laser design...
High-Speed Video Exposes Snapping Shrimp
Dec 1, 2000 — Scientists from the University of Twente in Enschede, the Netherlands, and their colleagues in Germany have solved the mystery of how snapping shrimp make their distinctive noises. Biologists had theorized that the crustaceans produce the 210-dB...
Holography Monitors Microscopic Marine Life
ABERDEEN, UK -- ABERDEEN, UK -- Scientists estimate that 80 percent of the oxygen in the atmosphere is produced by phytoplankton, ocean-dwelling one-celled photosynthesizing organisms. It seems understandable, therefore, that we would want to investigate the...
Laser Destroys Multiple Rockets
Dec 1, 2000 — TRW Inc.’s Space & Electronics Group of Redondo Beach, Calif., has reported that the Tacti-cal High Energy Laser/ Advanced Concept Technology Demonstrator successfully completed a series of salvo tests at White Sands Missile Range in New...
Laser Sensors Measure Force
KASSEL, Germany -- KASSEL, Germany -- When it comes to measuring force, the more precise the measurement, the better. Just ask anyone who makes a living designing high-precision acceleration sensors for aircraft navigation or fast tactile sensing systems in robots....
Lidar to Track Earth Atmosphere
BALTIMORE -- BALTIMORE -- Within the next five to seven years, NASA scientists and engineers from Johns Hopkins University plan to launch a next-generation fiber optic laser system to monitor the Earth’s atmosphere. Scientists rely predominantly on weather...
Lithographers Suggest Solutions to Smaller Features
Dec 1, 2000 — Semiconductor manufacturers should focus on the commercialization of extreme-ultraviolet and electron-projection lithographic techniques, recommended lithographers at the Next Generation Lithography Workshop, which was sponsored by International...
Measuring the Ultrasmall
HAMBURG, Germany -- HAMBURG, Germany -- Without measurement standards, our descriptions of the physical world would have no meaning. An essential standard defines atomic-scale dimensions, which are necessary to understand atomic and molecular structures. The distance...
MEMS-Based Gas Sensor Under Development
Dec 1, 2000 — Ion Optics Inc. of Waltham, Mass., has announced that it is developing a chip-based IR gas sensor that will be manufactured using microelectromechanical systems (MEMS) technology. The company expects that the device, known as SensorChip, will offer...
Microdisc LEDs Boast Higher Efficiencies
Dec 1, 2000 — Physicists at Kansas State University in Manhattan have developed LEDs with a novel architecture that display emission efficiencies greater than conventional devices. The interconnected microdisc LEDs, which the team describes in the Nov. 13 issue...
Microscopy Probes Ultrafast Dynamics
GÖTTINGEN, Germany -- GÖTTINGEN, Germany -- Researchers at the Max Planck Institute for Biophysical Chemistry have introduced a microscope that images molecular dynamics at a temporal resolution of 380 fs or faster. The all-optical, steady-state technique is...
Microstepping Improves Ronchigrams
Dec 1, 2000 — A team from the Universitat Politècnica de Catalunya in Terrassa, Spain, has developed a Ronchi test that increases the number of sampling points in a ronchigram and offers higher accuracy without increasing diffraction effects. In an...
Photonics Finds Solvents in Water
ATHENS, Ohio -- ATHENS, Ohio -- With the list of Superfund sites growing almost daily, the need for a reliable technique to test water samples on-site also increases. Researchers at Ohio University believe that near-IR spectrometers may have what it takes to be...
Researchers Grow Single-Crystal, 1.55µm VCSELs
Dec 1, 2000 — Researchers at the University of California in Santa Barbara have produced 1.55-µm vertical-cavity surface-emitting lasers (VCSELs) for telecommunications applications as a single crystal by molecular beam epitaxy. The process is more reliable...
Simple Sensor Detects Nerve Gas
SAN DIEGO -- SAN DIEGO -- A laser-based nerve gas sensor under development illustrates that we should not underestimate the power of the commonplace. First cobbled together for $24 from spare parts from CD players, the device outperforms nerve gas sensors that...
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July 2024
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