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(38,341 articles)
Popular News
Laser Technique Directs Photochemical Reactions
Nov 1, 2006 — Manipulating chemical reactions allows researchers to obtain desired outcomes. While chemical reagents typically control such manipulations, a team from the National Research Council’s Steacie Institute for Molecular Sciences in Ottawa and Queen’s University in Kingston, Ontario, Canada, has developed a laser-based method to influence photochemical reactions. The technique, known as dynamic Stark control, modifies potential energy barriers that ultimately control the direction that chemical...
Taking the Heat While Measuring Fuel Cells
Nov 1, 2006 — Solid-oxide fuel cells are getting attention as energy sources, but more information is needed to help optimize their performance. Unfortunately, their working temperatures typically are above 700 °C, making it difficult to get a detailed picture of...
Diode Laser Emits at 2 μm, Tunable Across 177 nm
Nov 1, 2006 — Tunable lasers that emit in the 2- to 3-μm spectral region have many applications in molecular spectroscopy, military countermeasures, and medical diagnostics and therapy. With an eye toward medical diagnostics — noninvasive blood glucose...
New Fiber Amplifier Provides Broadband Gain in the O-Band
Nov 1, 2006 — The C-band, between 1530 and 1565 nm, has been the spectral region of choice for dense wavelength division multiplexing telecommunications during the past decade because erbium-doped fiber amplifiers (EDFAs) provide efficient broadband gain in that...
Evanescent Coupling Lights up a Fiber
Nov 1, 2006 — A fundamental problem of modern photonics is transferring light efficiently between the optical fibers that transport light and the semiconductor devices that generate, control and detect it. One promising, albeit nascent, approach is to grow the...
All-Fiber Michelson Interferometer Proposed as Unique Sensor
Nov 1, 2006 — Researchers at Harbin Engineering University in China have demonstrated an all-fiber Michelson interferometer that they suggest could be used as a displacement sensor, an accelerometer or a flow-velocity sensor. Unlike many other fiber optic...
Nd:GdVO4 Laser Generates Deep-Blue Light at 440 nm
Nov 1, 2006 — Many “quasi three level” neodymium lasers, in which the lasing transition terminates on an upper sublevel of the ground state, have been operated in the past 40 years. But researchers at Centre Scientifique d’Orsay in France have demonstrated what...
Femtosecond Laser Quadruples Its Output
Nov 1, 2006 — As the energy available from femtosecond disk lasers creeps above a microjoule, the devices become interesting for use in several applications, not the least of which is three-color laser projection. The high peak power available from these lasers...
Microring Resonators Make Efficient Add/Drop Multiplexers for WDM
Nov 1, 2006 — A successful strategy since the first cavemen earned their tribe’s dinner by separating a single woolly mammoth from the herd has been “divide and conquer.” In modern times, it has morphed into a technique to design algorithms for solving complex...
All-Nanoparticle Coatings Increase Clarity
Nov 1, 2006 — Nanoparticle coatings with antireflective, antifogging and self-cleaning properties have been prepared by a team of researchers from MIT in Cambridge, Mass. Using an aqueous-based layer-by-layer deposition technique, the scientists created thin...
A Flexible Display with the Blues
Nov 1, 2006 — A group of researchers at the University of Central Florida in Orlando is not feeling blue, even though its displays are. By inducing a controllable blueshift in a thin film, it successfully fabricated a flexible display that can be wrapped around a...
Building a Better Guide Star, Times Five
Nov 1, 2006 — The nursery rhyme is half correct: Stars are not little, but they do twinkle — thanks to fluctuations in the atmosphere. Consequently, when astronomers peer upward, they get a less-than-perfect image of stars and planets. So they have turned to...
Super Imaging at a Distance
Nov 1, 2006 — In conventional microscopy, resolution is limited to about λ/2 of the light source because of diffraction. Scanning near-field microscopy (SNOM), in which a nanometer-scale probe with a tiny aperture is raster-scanned across an object of...
Simple Modification Yields Tunable Single-Mode Laser
Nov 1, 2006 — Wavelength-tunable, single-mode lasers can provide great flexibility to optical networks while reducing spare-parts inventories. Laboratories worldwide have investigated dozens of approaches — many successful — to producing such lasers. Despite the...
Seeing Heat in an Uncool Way
Nov 1, 2006 — Putting a new twist on an old idea, researchers from Oak Ridge National Laboratory in Tennessee, L-3 Communications Cincinnati Electronics in Mason, Ohio, and The Pennsylvania State University in Freeport have built an infrared imager out of...
Interrogating Fiber Optic Sensors on the Cheap
Nov 1, 2006 — Because fiber optic sensors are lightweight, compact and immune to electromagnetic interference, they have found numerous applications in monitoring industrial processes and mechanical structures. But reading the sensors’ data requires precision...
Better Switches for Planes
Nov 1, 2006 — Standard electrical wiring in aircraft is bulky, is heavy and can lead to fires. But now, researchers at Texas A&M University in College Station say that switches that once operated electrically may be replaced with those that work...
StockerYale Acquires Photonic Products for $9.4M
SALEM, N.H., Nov. 1, 2006 -- StockerYale Inc., a provider of photonic-based products, announced yesterday it has acquired privately held laser diode maker Photonic Products Ltd. of England for $9.4 million. Under the terms of the transaction, StockerYale paid a total of...
Advanced Glass Named GfE Coating Rep
Nov 1, 2006 — Advanced Glass Industries, a Rochester, N.Y., maker of optical glass blanks, was recently named the North American sales representative for the precision optics industry for GfE Coating Materials, of Nuremberg, Germany. Created in 1985 as an R&D...
UCSC Professor to Head UC Observatories/Lick Observatory
Nov 1, 2006 — The University of California (UC) has appointed Michael Bolte, PhD, professor of astronomy and astrophysics at the University of California, Santa Cruz (UCSC), as director of the UC Observatories/Lick Observatory, effective July 1. Bolte has served...
Optoelectronics Expert Joins Lumera Board
Nov 1, 2006 — Kimberly D.C. Trapp, an industry liaison officer at Lehigh University’s Center for Optical Technologies, has joined the board of Lumera Corp., a Bothell, Wash., nanotechnology company that makes molecular structures and polymer compounds for the...
A Step Toward Fusion Energy
RENO, Nev., Nov. 1, 2006 -- A small but important step has been made toward understanding one of physics' biggest mysteries -- the creation of controlled fusion energy. But it was not taken by one of the trillion-watt-generating giant lasers at a national laboratory. Instead,...
Kodak Prevails in Patent Suit
ROCHESTER, N.Y., Nov. 1, 2006 -- After nearly two years of litigation, a federal court ruled yesterday that Eastman Kodak Co.'s digital cameras do not infringe a patent owned by Ampex Corp., Kodak announced today. Kodak said that the federal court in the District of Delaware...
There's Still Time to 'Hitch a Ride' on NASA Craft
PASADENA, Calif., Oct. 31, 2006 -- NASA has received the names of more than 170,000 space enthusiasts from around the world and is putting them on a silicon chip on a spacecraft that will travel through an asteriod belt. There's still time to "climb aboard", but you must submit your...
Sofradir to Supply SWIR Detectors
VEUREY-VOROIZE, France, Oct. 31, 2006 -- Sofradir, a French maker of advanced infrared (IR) detectors, announced it has signed a €1 million ($1.3 million) contract with a worldwide supplier of electro-optic space and defense systems to provide large-format, 30-µm pixel pitch shortwave...
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