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Research & Technology News
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 the guidance and stabilization of miniature unmanned aerial vehicles has a field of view of approximately 165°. It produces data that indicate translational and rotational motion in three dimensions in low-light conditions. Courtesy of Christel-Loic...
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...
Small Smile Produces Big Output from SCOWLs
Sep 1, 2005 — Researchers at Massachusetts Institute of Technology's Lincoln Laboratory in Lexington have combined the beams from 100 slab-coupled optical waveguide lasers (SCOWLs) to generate 35 W of near-diffraction-limit output power at 915 nm. The high beam...
Fiber Ring Laser Is Wavelength-Switchable Around 1.5 µm
Aug 1, 2005 — Multiwavelength lasers are useful for interrogating fiber optic sensors and for testing fiber telecommunications systems, and some day could even serve as telecom transmitters. It sometimes is useful for the laser to produce many wavelengths...
Holey Fibers Connect to Conventional Fibers with Low Loss
Aug 1, 2005 — Holey fibers have several characteristics that make them useful in numerous applications, including the ability to manipulate dispersion. But an impediment to their widespread utilization has been the difficulty in splicing holey fibers to...
InAs/GaSb Superlattice Photodiode Offers Uncooled Mid-IR Operation
Aug 1, 2005 — Scientists from Northwestern University in Evanston, Ill., the Missile Defense Agency in Washington and the US Air Force Research Laboratory at Kirtland Air Force Base in New Mexico have reported the development of mid-infrared photodiodes that are...
Measuring Microholes by Measuring Shadows
Aug 1, 2005 — Measuring microscopic holes may benefit from a light touch, according to researchers from the National Institutes of Standards and Technology (NIST) in Gaithersburg, Md., and the University of North Carolina at Charlotte. They have devised a method...
Nanoscale Structures Route Light
Aug 1, 2005 — In a development with promise for the realization of nanoscale integrated photonic systems, investigators have routed and sensed light using nanowires and nanoribbons. A team from the University of California, Berkeley, Lawrence Berkeley National...
Optical Data Stored on Fingernail
Aug 1, 2005 — Researchers at the University of Tokushima and at Hokkaido University in Sapporo, both in Japan, have used human fingernails as a medium for three-dimensional optical data storage. Employing a femtosecond laser to write and a fluorescence microscope...
Surface Plasmons Enable Subwavelength Lithography
Aug 1, 2005 — A pair of researchers at the University of Texas at Austin have found that the way to subwavelength nanoscale photolithography is only skin -- or surface -- deep. They used surface-plasmon-assisted photolithography with polarized 355-nm laser...
Thermal Compensator Polarizes Nd:YAG Laser
Aug 1, 2005 — Most of today's conference presentations and journal articles dealing with solid-state lasers are concerned with exciting new technologies such as fiber lasers, photonic crystals and thin-disk lasers. But out in the global marketplace, the...
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July 2024
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