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(38,317 articles)
Popular News
Widely Tunable Terahertz Generator Developed
May 1, 2002 — Researchers at Riken's Photo Dynamics Research Center in Sendai, Japan, have developed a 0.7- to 2.4-THz, 125- to 430-µm terahertz wave parametric generator (right) that is injection-seeded by an external cavity diode laser to provide a Fourier transform-limited linewidth of 100-MHz-and-wider tunability than previous designs. The generator uses a gain medium of two MgO:LiNbO3 crystals in series to produce outputs as large as 1.3 nJ per pulse with a peak power greater than 200 mW at room...
Two-Photon Absorption Enables Microfabrication
May 1, 2002 — Two-photon absorption tech-niques that have proved beneficial to biological imaging are spilling over into the industrial realm. Researchers at Osaka University in Suita, Japan, are using two-photon absorption to create polymer structures with...
Laser Ultrasound Tests Train Tracks
May 1, 2002 — A train accident occurs in the US every 90 minutes, many of which are attributable to undetected cracks in the tracks. Ultrasound techniques are used to test for cracks, but they are limited in application and have difficulties detecting cracks that...
Nanosecond Pulses Improve Laser Nitriding
May 1, 2002 — Nanosecond excimer laser pulses yield better results than femtosecond pulses when laser nitriding iron, according to a paper published in the Feb. 11 issue of Applied Physics Letters. Laser nitriding exposes iron to a high-power-density laser in...
Mid-IR VCSEL Operates at Room Temperature
May 1, 2002 — An optically pumped vertical-cavity surface-emitting laser (VCSEL) that emits in the mid-IR at above room temperature in pulsed mode could have far-reaching implications for chemical analysis and atmospheric pollution monitoring. Nearly all gas...
Team Moves Bose-Einstein Condensates 44 cm
May 1, 2002 — A team from Massachusetts Institute of Technology in Cambridge has moved gaseous Bose-Einstein condensates as far as 44 cm using an optical tweezer method. As described in the Jan. 14 issue of Physical Review Letters, the researchers used a 5-W,...
Simpler Technique Measures Group Velocity Dispersion
May 1, 2002 — Group velocity dispersion in optical fiber degrades the quality of transmitted data and limits the data rate. If the dispersion in the system is known, it can be compensated, but measuring it takes sensitive, specialized equipment. A new technique...
Laser Emits Broadband Radiation
May 1, 2002 — Think laser, and odds are that you'll think monochromaticity. A quantum cascade laser developed at Lucent Technologies Inc.'s Bell Labs in Murray Hill, N.J., however, threatens to overturn this "narrow" conception. Quantum cascade lasers are...
Coastal Imager Provides Linear Results
May 1, 2002 — Tests performed by the Naval Research Laboratory in Washington have found that the Ocean Portable Hyperspectral Imager for Low-Light Spectroscopy produces highly linear spectral and radiometric responses while imaging coastal environments. The...
Doppler Lidar Maps High-Altitude Winds
May 1, 2002 — According to Bob Dylan, the answer is blowing in the wind. That's certainly true for weather prediction, as winds throughout the atmosphere steer weather patterns and are an essential parameter for accurate forecasts. Unfortunately, the information...
Photodetector Developed with 1.5-µm Sensitivity
May 1, 2002 — Silicon-based photodetectors may benefit high-speed optical communications technologies because of their potentially simple integration. But developing a cost-effective, efficient detector that obtains a photoresponse in the 1.3- to 1.55-µm...
CARS Limits Background Interference
May 1, 2002 — Coherent anti-Stokes Raman scattering (CARS) microscopy allows viewing of live biological samples -- without photoluminescent labeling or staining -- by using three laser beams to induce electromagnetic vibrational signals from a sample. However, it...
Microscopy Techniques Image Organic LED Bubble Formation
May 1, 2002 — Scientists from the Institute of Materials Research and Engineering in Singapore have examined the formation of dark spots in organic LEDs caused by dome-shaped bubbles at the interface between an emissive and nonemissive diode layer. Using the...
InAlGaN Quantum Wells Boost UV Emission
May 1, 2002 — Using InAlGaN-based multiple quantum wells fabricated on SiC, Japanese researchers from Riken in Saitama, Waseda University in Tokyo and Tokyo Institute of Technology in Yokohama have produced high-intensity 300- to 340-nm emissions at room...
Lasers Induce Transformation of Benzene
May 1, 2002 — Multiple 70-mW continuous-wave laser sources have been used by researchers from the Università di Firenze and the European Laboratory for Nonlinear Spectroscopy and INFM, both in Florence, Italy, to induce the chemical transformation of crystalline...
Raman Imaging Probes Ancient Rocks
May 1, 2002 — The microscopic structures discovered in the 3.5 billion-year-old rocks of Western Australia known as the Apex cherts, are among the earliest known signs of life on Earth. Or are they? The cherts were reported in 1993 by J. William Schopf of the...
Daily News Briefs
May 1, 2002 — Nicola Pignati has been promoted to president and CEO of New Focus Inc., supplier of innovative products serving the telecommunications, test and measurement and photonics tools markets. He will join the board of directors following the company's...
Three-Five Systems Acquires Inviso Patents and Assets
May 1, 2002 — TEMPE, Ariz., May 1 -- Three-Five Systems Inc. has completed the acquisition of all the intellectual property and selected assets of Inviso Corp., a former LCoS microdisplay company that focused on near-to-eye applications. Jack Saltich, Three-Five...
Teledyne Technologies Wins Space and Missile Defense Command Contract
May 1, 2002 — LOS ANGELES, May 1 -- Teledyne Solutions Inc. has been awarded a multimillion-dollar contract from the US Army Space and Missile Defense Command (SMDC). Teledyne Solutions will provide a broad array of technical services in support of the contract,...
Planar Systems Acquires DOME Imaging Systems
May 1, 2002 — BEAVERTON, Ore., May 1 -- Flat-panel-display maker Planar Systems Inc. has completed its acquisition of DOME Imaging Systems of Waltham, Mass. DOME's display systems for diagnostic imaging will augment Planar's line of medical-grade display and...
NeoPhotonics, Ardesta to Explore Nanomaterial Uses
Apr 30, 2002 — ANN ARBOR, Mich. and FREMONT, Calif., April 30 -- Ardesta LLC and NanoGram announced they have begun a strategic relationship to accelerate commercialization of unique nanomaterials in medical, energy storage and other markets. As part of this...
Meade Instruments to Supply Imaging System Technology
Apr 30, 2002 — IRVINE, Calif., April 30 -- Meade Instruments Corp. will supply a critical subassembly in the new Avera breast imaging system as part of a long-term strategic partnership with its manufacturer, Advanced Imaging Technologies, Inc. (AIT). The Avera...
Daily News Briefs
Apr 30, 2002 — Hitachi Ltd. has announced the following management changes: Isao Ono and Masaharu Sumikawa are new senior VPs and directors; resigning are Toshihiko Odaka, currently a senior VP and director, to be appointed a fellow of Hitachi Ltd., and Kunio...
Therma-Wave Files Patent Infringement Suit
Apr 30, 2002 — FREMONT, Calif., April 30 -- Therma-Wave Inc., producer of process control metrology systems used in semiconductor manufacturing, announced it has filed a patent infringement suit against Boxer-Cross in the US District Court, Northern District of...
MEMS for Optical Networks Prevails Despite Telecom Downturn
Apr 30, 2002 — SCOTTSDALE, Ariz., April 30 -- Despite the downturn in the telecom market, the development of microelectromechanical systems (MEMS)-based solutions for optical networking is moving forward at a rapid pace, with product offerings expanding beyond...
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August 2024
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