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(9,205 items)
Research & Technology News
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 sensors, theirs would be independent of environmental temperature and pressure changes because both arms of the Michelson would be affected equally by such changes. The researchers constructed the interferometer by splicing a dual-core fiber onto the end...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
Watermill Group Acquires Contract Coating Business
Nov 1, 2006 — The Watermill Group of Waltham, Mass., has launched MultiLayer Coating Technologies LLC in conjunction with its acquisition of the technology and assets of the contract coating business of Polaroid Corp. in New Bedford, Mass. The new company will...
'Garching Innovation' Now 'Max Planck Innovation'
Oct 27, 2006 — The Max Planck Society in Munich, Germany, announced this week that its technology transfer company, Garching Innovation, has changed its name to "Max-Planck-Innovation -- Connecting Science and Business". Max Planck Innovation advises and supports...
URochester Awarded $3M for Biomedical Optics Research
ROCHESTER, N.Y., Oct. 25, 2006 -- The University of Rochester will get $3 million in state support of its Robert B. Goergen Hall for Biomedical Engineering and Optics, state and university officials announced yesterday. "Rochester remains one of the top communities for higher...
ORNL to Host Nanotech Forum
OAK RIDGE, Tenn., Oct. 13, 2006 -- Nano Nexus 2007, a nanotechnology-oriented forum bringing together academia, industry and budding entrepreneurs will be held April 2-4, 2007, at Oak Ridge National Laboratory (ORNL). It is the first time this type of event has been hosted by a...
ORNL to Host Nanotech Forum Nano Nexus 2007
OAK RIDGE, Tenn., Oct. 13, 2006 -- Nano Nexus 2007, a nanotechnology-oriented forum bringing together academia, industry and budding entrepreneurs will be held April 2-4, 2007, at Oak Ridge National Laboratory (ORNL). It is the first time this type of event has been hosted by a...
A Little Hole in an Optical Fiber Has Many Uses
Oct 1, 2006 — Scientists at Aston University in Birmingham, UK, have fabricated a microchannel across the diameter of a single-mode fiber and used the tiny device to measure the refractive index of a fluid pumped into the channel. They envision applications in...
Bistable LCD Switches Optically
Oct 1, 2006 — With the popularity of portable electronic devices that incorporate LCDs, researchers have been exploring ways of reducing power consumption to enable those cell phones, laptop computers and personal digital assistants to run longer on a single...
Building a Better Detector with Black Silicon
Oct 1, 2006 — Exploiting an accidental discovery, researchers at the University of Texas at Austin, at Harvard University in Cambridge, Mass., and at the University of Virginia in Charlottesville have developed a silicon photodetector that has a high responsivity...
Femtosecond Pulses Write Grating in Nonphotosensitive Fiber
Oct 1, 2006 — Although fiber Bragg gratings can readily be written in photosensitive fibers with ultraviolet radiation, it is far more difficult to write them in the rare-earth-doped fibers that comprise all fiber lasers. As a result, the gratings that serve as...
Fiber Suppresses Stimulated Raman Scattering
Oct 1, 2006 — Stimulated Raman scattering (SRS) is a major impediment to high-power operation of fiber lasers and amplifiers. Recently, researchers at OFS Laboratories in Somerset, N.J., demonstrated how a specially designed, ytterbium-doped fiber can suppress...
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