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(38,284 articles)
Popular News
Scientists Report High Efficiency in Semiconductor Diode Laser
Jun 1, 1998 — Researchers at Semiconductor Laser International Corp. in Binghamton, N.Y., recently demonstrated an 808-nm, high-power semiconductor diode laser with an efficiency of 56 percent operating at 25 °C. The company's engineers altered the design of the diode and improved crystal growth quality. The low optical loss inside the laser diode increased the efficiency and output power level. The high-power diode could find applications in medicine, telecommunications and optical data storage.
Holography Comes to the Masses
Jun 1, 1998 — Since its introduction, holography has been stifled by its lengthy and complicated production process and limitations in image quality -- putting it beyond the reach of commercial success. Two companies are hoping to overcome those barriers by...
Photonics Weeds out the Impostor Jewels
Jun 1, 1998 — How many times have you opened the mailbox to read, "Congratulations! If you have the winning number, you will receive a valuable diamond pendant"? Your excitement builds when you see that your number matches the winning number, only to be let down...
Inexpensive Infrared Sensors Rely on Microcantilever
Jun 1, 1998 — In a bid to provide an alternative to high-priced, cooled IR detectors, Sarcon Microsystems Inc. of Knoxille, Tenn., has developed a microcantilever-based sensor priced at about $4000 for a 240 3 320 array. Cooled IR detectors can cost upward of...
Ion Plasmas Simplify Atomic Clocks
Jun 1, 1998 — Precision timekeeping and the understanding of white dwarf and neutron stars have been made easier through observations of a laser-cooled ion plasma created by researchers at the National Institute of Standards and Technology. Led by physicist...
Tiny Bubble Is Key to Optical Measurement
Jun 1, 1998 — Engineers at water treatment plants and other facilities that monitor biological and chemical pollutants in water are turning to optical techniques such as spectroscopy. These techniques are not without their drawbacks. Transparent cells holding the...
Transistors Work at Low Temp
Jun 1, 1998 — Engineers at Germanium Power Devices are refining a transistor that works at liquid helium temperature. The germanium field-effect transistor was pioneered by Texas Instruments but never put into extensive production. The Massachusetts company,...
Fluorescence Spectroscopy Measures Pollution in Boston Harbor
Jun 1, 1998 — Scientists have a new tool to measure the pollution in Boston Harbor. Researchers at the Massachusetts Institute of Technology in Cambridge, Mass., have developed a portable, fiber optic spectrofluorometer that detects harmful organic compounds. In...
Photonics Projects Are Among Award Semifinalists
Jun 1, 1998 — Teams from Japan, Belgium and Brazil made it to the semifinal round of the Texas Instruments Inc. DSP Solutions Challenge with projects that highlight the important relationship between photonics and electronics. The contest challenges engineering...
Tunable UV Free-Electron Laser Achieves Short Wavelength
Jun 1, 1998 — In trials at Duke University in Durham, N.C., a Russian-built tunable ultraviolet free-electron laser achieved 226 nm, a milestone that could portend uses in a variety of medical and physical science experiments. Known as the OK-4 optical klystron,...
Laser Texturing Slashes Cylinder Wear
Jun 1, 1998 — Laser texturing of engine cylinder walls may reduce oil consumption by 40 percent compared with traditional cylinder machining techniques, according to a manufacturer of engine honing equipment. Machine honing of engine cylinder walls gives them...
Fibers in Spark Plug Monitor Ignition
Jun 1, 1998 — University of Texas researchers and the Ford Motor Co. are collaborating on a spark plug that employs fiber to monitor pre-ignition fuel concentration. The goal, said developer Mathew Hall, is reduced engine pollutants and improved performance by...
Open Solar Telescope Overcomes Hot-Air Turbulence
Jun 1, 1998 — A new telescope perched 15 m above a mountaintop promises to solve many of the problems that plague telescopes designed to peer at the sun. Using a scheme that leaves the main mirror of the telescope open to ambient wind, solar researchers from...
Machine Vision Spots Spoiled Wheat
Jun 1, 1998 — In the past two years, wheat farmers in the US have faced a serious problem: Fungal spores, known as karnal bunt, have been infecting their crops. To prevent the spread of this blight, farmers and scientists have turned to photonics to speed up...
Engineers Test-Fire Airborne Laser
Jun 1, 1998 — The Airborne Laser Program has reached another milestone. In April, the US Air Force successfully tested the system, which points and focuses a laser at a hostile missile. Engineers conducted the experiments on a beam control system demonstrator...
News Flash Photonics Assesses El Niño's Devastating Path
Jun 1, 1998 — Anyone who turned on CNN this winter remembers the images: expensive homes teetering on the edge of rocky cliffs, vulnerable to the Pacific's waves. Those familiar images were the result of El Niño -- the weather phenomenon blamed for...
Laser Aids In Vitro Fertilization
Jun 1, 1998 — US scientists have successfully used a laser beam in clinical trials to promote pregnancies in women. The In Vitro Fertilization Workstation used in the procedure is manufactured by Cell Robotics International Inc. in Albuquerque, N.M. The...
New Machine Speeds Manufacture of Aspheres
Jun 1, 1998 — Engineers from the University of Rochester in New York, along with scientists at the US Department of Defense and seven corporate partners, have designed a system that automates the manufacture of specially shaped lenses known as aspheres. Aspheres...
SDL and Quinta to Develop Optical Storage
Jun 1, 1998 — The US Department of Commerce has awarded SDL Inc. and Quinta Corp., both of San Jose, Calif., a three-year, $3 million contract to develop advanced optical storage technology. The contract is part of the department's advanced technology program....
Spectra-Physics Wins $2.4 Million Contract for Optical Coatings
Jun 1, 1998 — Spectra-Physics has received a $2.4 million contract to develop optical coatings for the National Ignition Facility. The facility's laser system will require 8000 large optical components and 30,000 smaller ones. Spectra-Physics will manufacture the...
Holographic Storage: A Viable Alternative for Space?
Jun 1, 1998 — As space missions venture further into the depths of the universe n and further away from Earth n engineers are pressed to come up with data storage systems that will prove more capable and more reliable. While holographic storage hasnit been chosen...
Terrestrial IR Imaging Benefits from Aerospace Programs
Jun 1, 1998 — Infrared imaging systems are exploding into virtually every corner of the industrial workplace. Improved resolution, thermal sensitivity, ruggedness and portability of imager components have expanded the use of imaging systems, and a good many of...
Photonics Helps Space Designers Battle Costs
Jun 1, 1998 — Space agencies around the world are looking for ways to do more with less. In the US, NASA has spent the past few years emphasizing smaller, faster, cheaper missions. Since taking over as the agencyis director in 1992, Daniel Goldin has pushed...
Solid-State Lasers Join the Space Race
Jun 1, 1998 — In the 60s and 70s, scientists had carte blanche to develop space instruments. However, in todayis cost-conscious space programs, laser designers look towards Earth and improving commercial technologies to meet cost guidelines and accomplish mission...
Optical Morphology:
Jun 1, 1998 — For many people, optics are but one of the many components that make up a system. They understand the specifications the optics must meet but, many times, they do not know nor are they concerned about the broader performance characteristics of the...
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