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(38,322 articles)
Popular News
PhotoSynergy Receives 'Smart' Funding
Sep 1, 2003 — The Scottish Executive has bestowed a 2002 Smart: Scotland award on PhotoSynergy Ltd. of Dundee, UK, to help the company commercialize its technology. Formed last year as a joint venture between Ferranti Photonics Ltd. of Dundee and the University of St. Andrews in the UK, the company produces IR and green lasers that have applications in display and emergency safety lighting, and in the industrial, scientific and medical fields. As one of the 16 round-three winners of this funding to...
Teltron Gains Orders for Military Sensors
Sep 1, 2003 — Teltron Technologies Inc. of Birdsboro, Pa., has received 28 orders from the US government and military contractors to manufacture or remanufacture camera tube imaging sensors for use in hardware on platforms such as the F-111 Aardvark, the AH-64A...
Colored Lights Reveal Hidden Images
Sep 1, 2003 — Color scientists at Xerox Corp.'s Wilson Center for Research and Technology in Webster, N.Y., have come up with a disappearing act that features high-quality color photographs. Under illumination with one color of light, a print reveals one detailed...
Laser-Induced Incandescence Measures Soot in Jet Exhaust
Sep 1, 2003 — When monitoring the performance of jet engines, aerospace engineers typically are concerned with intake phenomena, such as how wind velocity, rain and shock waves affect the turbine at subsonic to supersonic speeds. But a growing awareness of the...
Sensors and New Materials Build Smart Bridges
Sep 1, 2003 — Armies of workers laid 650,000 miles of road and erected 75,000 bridges from 1935 through 1939 under the Works Progress Administration. The program was an unqualified success, and these structures remain a large part of the highway system in the US....
Solid-State Lasers Are Gunning for Argon-Ion's Place
Sep 1, 2003 — Frequency-doubled diode lasers that produce blue light at or near 488 nm have emerged over the past couple of years, potentially affecting the multibillion-dollar instrumentation market based on the air-cooled argon-ion laser that has evolved over...
VCSELs Go Long-Wave
Sep 1, 2003 — Vertical-cavity surface-emitting lasers (VCSELs) are now routinely used in photonics applications such as telecommunications, primarily at 850 nm. Their long-wavelength cousins — 1300- and 1550-nm devices — still have some way to go before they...
Multilayer Dielectric Gratings Enable More-Powerful High-Energy Lasers
Sep 1, 2003 — Over the past 20 years, the use of chirped-pulse amplification has enabled lasers to produce powerful pulses in the femtosecond and picosecond time regime. The development of higher-energy lasers is hampered by a major limiting factor. In...
Frame Grabbers Fine-Tune Machine Vision
Sep 1, 2003 — Frame grabbers convert video images from cameras into digital format and transfer these digital images to PCs, which use the converted data to make decisions about the objects being inspected. Although performing these functions quickly and reliably...
Making Connections: Real-World Telecom Component Production
Sep 1, 2003 — Today’s telecommunications market requires reliable, low-cost transmitters and receivers. But for the mass deployment of optical connection technology, optical communications technologies must be cost-competitive with existing solutions. To achieve...
Feedback Stabilizes High-Power Diode Lasers
Sep 1, 2003 — High-power, broad-area semiconductor lasers exhibit spatial and temporal instabilities due to fundamental nonlinear interactions between the intense optical field and the semiconductor material. These interactions result in a broad spectral emission...
Wavelength Converter Features Three-Wave Mixing Inside a Pump Laser
Sep 1, 2003 — A research group at McMaster University in Hamilton, Ontario, Canada, has proposed and demonstrated an intracavity approach to wavelength conversion for optical telecommunications networks that eliminates the need for high-power, tunable pump...
High-Power Yb-Doped Fiber Laser Emits at 977 nm
Sep 1, 2003 — Engineers at the University of Southampton and at Southampton Photonics Inc. in the UK have demonstrated the first high-power -- i.e., greater than 1 W -- ytterbium-doped fiber laser emitting at 977 nm. Such a device might find use as a pump for...
System Measures Raman Gain in Bulk Glasses
Sep 1, 2003 — Scientists from the University of Central Florida in Orlando have developed an optical system to measure stimulated Raman gain coefficients in bulk glasses. They have used it to investigate two tellurite glasses developed at the Centre National de...
Investigations Probe Ultraslow and Superluminal Light
Sep 1, 2003 — In the few short years following the demonstrations of the slowing and stopping of light in ultracold clouds of atoms and of the superluminal propagation of radiation, researchers have entered a golden age of exploration into such phenomena. Two...
Laser Links Depend on the Weather
Sep 1, 2003 — Researchers at Ben-Gurion University of the Negev in Beersheba, Israel, have performed a mathematical analysis of the wavelength-dependence of atmospheric interference on free-space optical links. Their results will affect the wavelength of...
Selecting Lenses to Maximize IR Camera Performance
Sep 1, 2003 — Many factors must be considered when choosing an infrared lens for a thermal imaging camera. These include knowledge of the technology being used and of the intended application for the imager. It is also essential to have a good idea of what...
Molecularly Bridged Quantum Dots Transfer Spin Information
Sep 1, 2003 — Using a two-color time-resolved Faraday rotation measurement technique, researchers at the University of California, Santa Barbara, have observed the transfer of electron spin information between molecularly linked CdSe quantum dots at room...
Holey Fibers Enable New Wavelengths
Sep 1, 2003 — A group at the University of Bath in the UK and at Los Alamos National Laboratory in New Mexico has presented numerical simulations and experimental findings that show that controlling the chromatic dispersion profile of photonic crystal fibers...
Photons Entangled over the Danube
Sep 1, 2003 — To demonstrate the viability of free-space configurations as an alternative to optical fiber for quantum key distribution systems, scientists at Universität Wien in Vienna, Austria, have performed a real-world experiment in which they transmitted...
Heat Spreader Boosts Laser Power
Sep 1, 2003 — Optically pumped vertical-external-cavity surface-emitting lasers are attractive in a number of applications but have suffered from thermal loading because the pump beam is focused to such a small spot -- typically 100 µm -- in the lasers' gain...
Bidirectional Multiplexer Features Six-Port Circulators
Sep 1, 2003 — Unidirectional optical add/ drop multiplexers are common elements in fiber optic networks, but bidirectional designs have been complex and generally lack flexibility. A team of engineers at the University of Melbourne in Australia recently designed...
Diffractive Microlens Cuts Laser Costs
Sep 1, 2003 — Assembly and alignment are major cost drivers in the fabrication of photonic components. Nowhere is this more evident than in the packaging of laser modules for metropolitan optical networks, for which demand is growing rapidly. A team at Oki...
Fresnel Optics Investigated for Next-Generation Lithography
Sep 1, 2003 — Achromatic Fresnel optical sys-tems under development at Xradia Inc. of Concord, Calif., promise to compete with mirror-based solutions for next-generation extreme-ultraviolet lithography in the production of integrated circuits. The researchers at...
Twin-Detector Receiver Detects Single Photons over 100 km
Sep 1, 2003 — A low-noise receiver developed by a team of scientists at NEC Corp. and Japan Science and Technology Corp., in collaboration with the Telecommunications Advancement Organization of Japan, has enabled the transmission of single 1550-nm photons over...
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August 2024
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