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(38,325 articles)
Popular News
Displays Doped with Lanthanides
Nov 1, 2003 — Emissive display technologies are benefiting from the development of new materials, notably organic LEDs. These electroluminescent devices do not require a front or back light, and they offer a wider angle of view than liquid crystal displays. Nevertheless, efforts toward developing full-color versions are complicated by the need for a material to serve as blue pixels. Researchers at the University of Cincinnati's Nanoelectronics Laboratory, headed by Andrew Steckl, hope to resolve this...
Diagnostic Laser Beam Measurement
Nov 1, 2003 — Measurement of spatial beam intensity distribution — a beam profile — and of beam propagation characteristics is an integral part of today’s many high-precision, laser-based applications where beam quality is critical. The basic definitions and...
Deposition Equipment Fine-Tunes Optical Coatings
Nov 1, 2003 — Over the past few years, the need to pack more telecommunications channels into a given swath of optical spectrum has forced manufacturers to offer deposition equipment that produces less costly and more uniform optical coatings. Although the pace...
Fiber Optic Connectors: Meeting Polishing Demands
Nov 1, 2003 — Optical fiber is a good vehicle for high-speed data transmission as long as light transmission is efficient — even across connector assemblies. This translates to a need to polish connector end faces to optimize performance. Increasingly, with the...
Holographic Volume Bragg Gratings Stabilize Laser Diode Performance
Nov 1, 2003 — High-power multimode laser diodes, emitting >1 W per diode, and laser diode arrays, emitting tens or even hundreds of watts, have many important applications, such as medicine, materials processing and pumping solid-state lasers. The market for...
Picking Wheat from Chaff
Nov 1, 2003 — A missile launches from a remote silo, streaks upward through the clouds, then shoots above the atmosphere. There is no chance to stop the re-entry vehicle from hitting its target unless it can first be identified — picked out from the natural Earth...
Amps Can Provide Flat Gain Across C-, L-Bands
Nov 1, 2003 — A research group at the Electronics and Telecommunications Research Institute in Taejon, South Korea, has shown that it is mathematically possible to obtain relatively flat gain across the C- and L-bands by combining the gain from erbium ions'...
Double-Pass Amplifier Delivers High Gain and Low Noise
Nov 1, 2003 — Researchers at Universiti Putra Malaysia in Serdang have conceived and implemented a double-pass amplifier that incorporates a narrow-bandpass filter between the first and second passes to filter out amplified spontaneous emission. The amplifier has...
Good Splices Make Good Lasers
Nov 1, 2003 — Intracavity losses of a fraction of a percent can cut the output power of a low-gain laser, such as an erbium-doped fiber laser, by a factor of two or more. A significant source of loss in an erbium-doped fiber laser is the splice between the...
Laser Fabricates Waveguides in LiNbO3
Nov 1, 2003 — The two most common approaches for fabricating waveguides in LiNbO3 -- high-temperature in-diffusion of titanium and proton exchange -- are complex, involving high temperatures or acid treatment and at least one photolithographic step. Recently,...
CMOS Sensors Expand Their Universe
Nov 1, 2003 — What a difference a year -- or two -- makes with imaging technology. First-generation cell-phone cameras, for example, primarily used CCD sensors, but the cost benefits of CMOS technology, as well as increasing consumer demand for smaller handheld...
Direct Image Sensor Tackles Color Concerns
Nov 1, 2003 — When an application demands high-quality color imaging, CCD sensors once were the only alternative, but this is no longer the case for certain applications. Foveon Inc. in Santa Clara, Calif., believes that the key to boosting color imaging...
Sensors Support Low-Light Imaging
Nov 1, 2003 — One key to customer acceptance of CMOS imagers in the mobile market space is low-light performance. This is often specified in terms of the lowest light level at which the sensor produces an image with a minimally "acceptable" signal-to-noise ratio....
Large-Pixel Architectures Aid Radiographic Imaging
Nov 1, 2003 — Much of the effort in CMOS image sensor development to date has focused on circuit architectures and on fabrication processes for small devices. Typical applications in this category include cell-phone camera modules, Web cameras and video camera...
CMOS Technology Addresses Security Imaging Issues
Nov 1, 2003 — With increasing global demand for stringent security precautions, the need for high-performance, reliable and cost-effective cameras in both the public and private sectors is on the rise. High-definition video is the new benchmark for video quality,...
CCDs Promise 85 Percent Peak Quantum Efficiency
Nov 1, 2003 — Although the line between the functionality of CMOS and CCD imaging sensors has blurred for many applications, there are still times when one is a more optimum solution. Consider, for example, higher-performance scientific, astronomical and medical...
Levitators Offer High-Performance Glasses
Nov 1, 2003 — Researchers at the Glass Products Div. of Containerless Research Inc. of Evanston, Ill., are producing new rare-earth-doped glasses that have applications in high-power-density solid-state lasers, telecommunications, medical lasers, military and...
New Model Advances Plasmonics
Nov 1, 2003 — Scientists at Houston's Rice University have developed a model of the plasmon response of metallic nanostructures to light that may facilitate the development of such nanomaterials and devices. Plasmons are light-generated electronic density waves....
Mortar Round Snaps Recon Imagery
Nov 1, 2003 — A team of scientists at Georgia Institute of Technology's research institute in Atlanta has constructed a reconnaissance system that can be fired from conventional mortars and that offers tactical imagery in a fraction of the time and at lower cost...
'One and the Same' Atom Laser Displays Unique Behavior
Nov 1, 2003 — Scientists investigating one-atom at California Institute of Technology in Pasadena lasers have developed a device that displays no threshold for lasing and uniquely regular emissions. Unlike previous one-atom lasers and masers, which operate by...
MEMS Enable Tunable Lasers for Telecom
Nov 1, 2003 — Dynamically reconfiguring next-generation fiber optic telecom systems will require wavelength-tunable lasers that can provide a signal into any wavelength division multiplexed channel and that can switch among channels on the fly. Researchers around...
Mode-Locked, Tunable Fiber Laser Is Alternative to Ti:Sapphire
Nov 1, 2003 — Fiber lasers are being developed in laboratories around the world as alternatives to traditional solid-state lasers. The Ti:sapphire laser, however, has remained largely unchallenged as a source of broadly tunable, ultrashort pulses. But now a...
Holey Fiber Supports Megawatt Pulses
Nov 1, 2003 — Scientists at Corning Inc. in Corning, N.Y., have developed a hollow-core photonic bandgap fiber that supports ultrashort pulses of infrared radiation with peak powers more than 100 times greater than those tolerated by conventional optical fiber....
Single-Stage YAG Amplifier Sets Power Record
Nov 1, 2003 — A research group in Japan has achieved 132 W of average green power at 1 kHz by frequency doubling an Nd:YAG master oscillator power amplifier system. Both this second-harmonic power level and the 362 W of average fundamental power at 1 kHz from the...
Corning Grants Patent License to Tamron
Oct 31, 2003 — CORNING, N.Y. , Oct. 31 -- Corning Inc. and Tamron Co. Ltd., an optical components manufacturer based in Japan, announced they have concluded a license agreement under a portfolio of Corning patents for molded glass components used in digital still...
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