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(9,203 items)
Research & Technology News
Bad Tunnel Diode Enables Good Millimeter-Wave Sensor
Oct 1, 2005 — By realizing that a bad tunnel diode could form the basis for a good sensor, researchers at Ohio State University in Columbus, the US Naval Research Laboratory in Washington and the University of Notre Dame in Indiana may have found a new technology to detect concealed weapons without x-rays. A variation of the same approach could allow pilots to see through bad weather. The sensor works on ambient radiation at 94 GHz — corresponding to a wavelength of 3.2 mm, or 3200 µm. At this wavelength,...
Bragg Grating Reduces OPO Bandwidth by Factor of 20
Oct 1, 2005 — Because the wavelengths required for most spectroscopic, remote sensing and biophotonics measurements are rarely emitted by conventional lasers, nonlinear wavelength conversion is frequently employed in these applications. Stimulated Raman...
Brillouin Imaging Demonstrated
Oct 1, 2005 — Scientists at Arizona State University in Tempe have developed a confocal Brillouin imaging microscope that enables the rapid collection of information about the elastic properties of condensed matter systems. The system has potential applications...
Carbon Nanotubes Mode-Lock Fiber Laser
Oct 1, 2005 — Researchers at the University of Tokyo and at Alnair Laboratories Corp. of Kawaguchi, Japan, have demonstrated what they believe is the first 1300-nm laser mode-locked with carbon nanotubes. The accomplishment is an extension of their earlier work...
Double Duty for MEMS-Based Optical Switch
Oct 1, 2005 — Optical switches based on microelectromechanical systems (MEMS) are at the heart of next-generation “transparent” optical telecommunications networks. Nearly all of today’s networks are “opaque” in the sense that the optical signal is periodically...
Four-Wave Mixing Trumps Homogeneous Gain in Erbium Laser
Oct 1, 2005 — Although current wavelength-division multiplexing (WDM) systems require a different laser for each wavelength transmitted over an optical fiber, engineers envision more-efficient systems in which a single laser will emit all of the necessary...
Linear Optical Amplifier Generates Multiple Wavelengths Simultaneously
Oct 1, 2005 — The previous report describes a technique to finesse mode competition in a homogeneously broadened erbium-fiber laser. Researchers at Hong Kong Polytechnic University in Kowloon, China, have taken the opposite approach to obtaining multiple...
Novel Technique Monitors Carbonyl Sulfide
Oct 1, 2005 — Researchers at Universität Düsseldorf in Germany have developed a technique that they call cavity leak-out spectroscopy, a variation of cavity ringdown spectroscopy (see “Through the Looking Glass and What Cavity Ringdown Found There,” Photonics...
Photonics Goes Underground in Silicon
Oct 1, 2005 — A research group at the University of California, Los Angeles, has demonstrated the fabrication of optical devices — specifically, a microdisk resonator and coupling waveguides — beneath the surface of a silicon substrate, leaving the surface clear...
Pinhole Camera Targets New Unmanned Aerial Vehicles
Oct 1, 2005 — A research fellow at the University of Sydney in Australia has developed a field-widened pinhole camera for the guidance and stabilization of miniature unmanned aerial vehicles with wingspans of tens of centimeters. A compact pinhole camera for...
Programmable Optical Filter Uses Digital Mirror Array
Oct 1, 2005 — Investigators at Texas Tech University in Lubbock have demonstrated a programmable optical filter whose underlying technology may be applicable to numerous telecommunications devices, such as variable optical attenuators, dynamic optical add/drop...
Room-Temperature 9.5-µm Quantum Cascade Lasers Produce >100 mW
Oct 1, 2005 — As part of the Laser Photoacoustic Spectroscopy program funded by the Defense Advanced Research Projects Agency, researchers at Northwestern University in Evanston, Ill., have demonstrated quantum cascade lasers that produce 106 mW of CW 9.5-µm...
Self-Assembled Films Display Structural Color
Oct 1, 2005 — Scientists at Keio University in Yokohama, Japan, have developed a colloidal “ink” that becomes iridescent upon drying as a result of diffraction. Such materials that produce colors structurally have a variety of potential applications, including as...
Toyota CRDL Demonstrates Inexpensive Bidirectional Fiber Communications
Oct 1, 2005 — Plastic optical fibers are beginning to replace electrical wiring harnesses in many automotive applications because of their low cost, light weight and immunity to electromagnetic interference. Recently, engineers at Toyota Central R&D...
Korber Foundation Honors Scientist for His Photonic Fiber Research
Sep 7, 2005 — HAMBURG, Germany, Sept. 7 -- The 2005 Korber European Science Award has been presented to Philip St. John Russell, professor of physics at the University of Bath in England, for his work developing a new type of optical fiber known as a "photonic...
All-SiO2 Fiber Pressure Sensor Sets Sensitivity Record
Sep 1, 2005 — By fabricating a miniature Fabry-Perot interferometer on the tip of a single-mode fiber, researchers at the University of Maribor in Slovenia have created a pressure sensor that they believe is two orders of magnitude more sensitive than any...
CW GaN Laser Diodes Grown by Molecular Beam Epitaxy
Sep 1, 2005 — Next-generation DVD technology -- whether it's Blu-ray, as supported by Sony, Sharp and about a dozen other companies, or HD-DVD, supported by Toshiba, NEC and several others -- will require 405-nm blue lasers. Thus, millions of dollars are being...
Digital Velocimetry Exposes Hummingbird Flight
Sep 1, 2005 — Hummingbirds are fascinating to watch because, unlike other birds, they can hover in one spot for periods of time. The birds have been likened to insects in the way they flap their wings, but researchers from Oregon State University in Corvallis,...
Eye-Safe, Wavelength-Tunable Fiber Laser Generates >100 W
Sep 1, 2005 — Eye-safe lasers -- those that emit in the 1.5-µm region where the cornea does not transmit -- are important for many applications, including free-space communications, remote sensing and rangefinding. Significant power levels often are required...
Inexpensive Optical Accelerometer Is Simple to Fabricate
Sep 1, 2005 — The advantage of optical accelerometers over their electrical counterparts is their ability to function in harsh electrical environments. Recently, scientists at Tecnische Universität Braunschweig in Germany and at Centre Nacional de...
Jammed Beads Simulate Glass Transition
Sep 1, 2005 — University of Chicago researchers have experimentally determined that the forces on granular systems differ qualitatively depending on whether the particles are flowing or jammed. The findings offer insight into the behavior of glasses, pointing to...
Mode-Locking Technique Well Suited for Fiber Lasers
Sep 1, 2005 — For most of the four decades since their first demonstration, mode-locked lasers have been restricted largely to scientific applications, where skilled technicians can monitor the devices and provide the frequent tweaking necessary for steady...
Nd:GdVO4 Laser Is Tunable Around 1.08 µm
Sep 1, 2005 — At National Chiao Tung University in Hsinchu, Taiwan, researchers have demonstrated what they believe is the first 1.08-µm Nd:GdVO4 laser and have shown that Nd:GdVO4 is superior to other sources that have been developed for the optical pumping of...
Neutrino Detector Focuses on Earth
Sep 1, 2005 — A team of 87 scientists from Japan, the US, China and France has reported the results of its study of electron antineutrinos produced in the Earth by radioactive decay. Its findings confirm that the Kamioka liquid scintillator antineutrino detector,...
Pulse Delivered by Hollow Optical Fiber Creates Spark
Sep 1, 2005 — Research shows that significant improvements in combustion efficiency can result when the igniting spark in an internal combustion engine is in the center of the cylinder rather than along the walls or near the electrodes, where the ignition kernel...
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January 2025
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