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(38,320 articles)
Popular News
Physical and Geometric Methods Combined to Model Optics
Aug 1, 2002 — For nearly the entire history of modern lens design, engineers have used geometric ray tracing to model light propagation through optical components. This may soon change, however, thanks to the ever-increasing speed of computers.Ray tracing is based on the assumption that light is essentially a multitude of independent incoherent particles. Decomposing the beam into incoherent rays means that diffraction or coherent interference between parts of the beam is not an issue. Thus, the lens...
How Well Can Cameras Measure Color?
Aug 1, 2002 — Video cameras find use in many automatic inspection applications, from checking the construction of automobiles to scanning microscope specimens for cancerous cells. Often it is important to inspect color as well as other attributes of a product;...
Shipbuilder Boosts Welds with Lasers
Aug 1, 2002 — With Lindbergh's trans-Atlantic flight in 1927, it appeared that the days of the ocean liner were numbered and that floating palaces like Olympic and Aquitania that had once ruled the seas might forever pass into oblivion. And so they nearly...
Line Scanning to Save Player Piano Rolls
Aug 1, 2002 — Although to modern ears the music of a player piano is a sound track for the gilded age, the instrument that made ragtime a ubiquitous part of the American musical experience relied on one of the most sophisticated recording technologies of its...
Clock to Be Tested in Microgravity
Aug 1, 2002 — When the "primary atomic reference clock in space" project is launched in 2005, it will measure the relativistic effects of gravity on time. The project is the first flight to the international space station of NASA's Laser Cooling and Atomic...
Microlasers Developed for Altimetry
Aug 1, 2002 — When Lewis and Clark set out from the head of the St. Louis River in 1804 to chart the unexplored territory west of the Mississippi, each mile surrendered by the wilderness was measured in the plodding steps of an expedition that took three years to...
Optical Networking Is Placed on Hold
Aug 1, 2002 — When attendees at the Conference on Lasers and Electro-Optics (CLEO) gathered in May to hear the latest forecast for the optical communications sector, it's a pretty safe bet that few were surprised to hear bad news. But the bleak picture,...
NEMI Unveils Optoelectronics Projects
Aug 1, 2002 — The National Electronics Manufacturing Initiative, an industry-organized "virtual consortium" known as NEMI, has announced three new optoelectronics projects focusing on optical adhesives, fiber handling and fiber optic signal performance. The...
What's Sapping Foreign Investment in Israel?
Aug 1, 2002 — In the fall of 2000, Israel's technology sector was about to change course -- in two respects. Second only to the US in the number of high-tech start-ups, the country was on its way to drawing a record $11 billion in foreign investment, which...
GaSe Yields High-Output IR Beyond 20 µm
Aug 1, 2002 — Using a GaSe nonlinear optical crystal, researchers at Lehigh University in Bethlehem, Pa., and the US Air Force Research Laboratory at Wright Patterson Air Force Base in Ohio have produced widely tunable mid- to far-infrared radiation that extends...
Blue LED and Phosphor System Yield White Light
Aug 1, 2002 — By combining a blue organic LED with a down-conversion phosphor system, researchers at General Electric Global Research Center in Niskayuna, N.Y., have created a white-light device that can deliver illumination over the range of color temperatures...
Waveguides Provide Multichannel Routing
Aug 1, 2002 — Researchers from Friedrich Schiller Universität and Fraunhofer Institut für Angewandte Optik und Feinmechanik, both in Jena, Germany, have shown that thermo-optically controlled waveguide arrays can be used for multichannel routing. By...
Semiconductors Stick Through a Cool Marriage
Aug 1, 2002 — The ubiquitous semiconductor silicon is electronically powerful, but optically weak. It is blind, for example, in the 1.3- to 1.6-µm region of the spectrum that is useful for telecommunications applications. Germanium, on the other hand, excels at...
Laser Technique Aids Spintronics
Aug 1, 2002 — A research group at Eindhoven University of Technology in Eindhoven, the Netherlands, and at IMEC vzw in Louvain, Belgium, has demonstrated an optical technique that could provide needed materials data for the development of spintronics, leading to...
Semiconductor Amplifier May Pose Alternative for DWDM
Aug 1, 2002 — The output power and emission wavelengths of most of today's dense wavelength division multiplexing (DWDM) transmitters are highly sensitive to changes in temperature and injection current, requiring costly and complex compensation methods....
Optical System Simulates PMD
Aug 1, 2002 — Polarization mode dispersion (PMD) in legacy fiber is one of the greatest obstacles to upgrading telecommunications networks from 2.5 Gb/s to 10 and 40 Gb/s. Although means are emerging to compensate for polarization mode dispersion, it has been...
Planar Designs Produce Compact Devices
Aug 1, 2002 — A team from the Weizmann Institute of Science in Rehovot, Israel, has created a set of compact optical devices by using diffractive optical elements deposited on a planar glass substrate. It expects the designs, which consist mainly of grating...
MIT Designs High-Brightness Laser Diode
Aug 1, 2002 — Researchers at Massachusetts Institute of Technology's Lincoln Laboratory in Lexington have designed a high-brightness laser diode that uses a slab-coupled waveguide with multiquantum-well gain regions to produce high power with nearly circular...
Air Force Measures Refractive Index of BGG
Aug 1, 2002 — Barium gallogermanate glasses are extraordinarily strong yet still exhibit a transmission region from 0.4 to 5.0 µm, making them seemingly ideal for a vast array of large-optic applications. A team from the US Air Force Research Laboratory at...
Laser Induces Conformational Changes
Aug 1, 2002 — Since Louis Pasteur's investigations into the optical activity of fermentation compounds in 1848, scientists have understood that the chemical properties of a substance depend on both the type and the physical arrangement of its components....
Space Electrons Dig Pits in Coatings
Aug 1, 2002 — One may not think that space-borne telescopes would need much protection from outside elements, but electrons and protons caught in the Earth's magnetic field can have damaging effects on the dielectric coatings of the telescopes' lenses....
Photonic Crystals Integrated into VCSELs
Aug 1, 2002 — Single-fundamental-mode vertical-cavity surface-emitting lasers (VCSELs) could benefit data transmission applications, but designing such a device to function over an entire pump range is difficult because of eventual material deformations such as...
Multilayer Coating Shows Atomic Precision
Aug 1, 2002 — Extreme-ultraviolet wavelengths don't transmit well, even through gaseous materials like air. Consequently, the EUV lithography prototype stepper being developed by a consortium of government and semiconductor industry partners steers its 13.4-nm...
Lasers Grown from Solid Arsenic
Aug 1, 2002 — Using gas-source molecular-beam epitaxy and a solid arsenic source, a team from Princeton University in New Jersey has constructed a 1.3-µm InGaAsN quantum-well laser with a characteristic temperature of 122 K and quantum efficiency of 82...
Technique Renders High-Contrast Images of Semiconductor Sites
Aug 1, 2002 — A procedure combining optical-beam-induced current imaging and scanning confocal microscopy has produced high-contrast images of semiconductor sites on an integrated chip. Although imaging optically induced current is an effective method for...
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August 2024
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