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(38,284 articles)
Popular News
Living Sensors Glow at Change
Aug 1, 1998 — Colonies of luminescent bacteria promise to become biological sensors capable of detecting a variety of parameters such as temperature, pressure or specific chemicals. The microbes, engineered at Britain's chemical and biological defense laboratory, glow when they are exposed to changes in pressure, and researchers there hope to make other bacteria that respond to different environmental factors. The bacteria have several types of protein on their cell walls that are sensitive to changes in the...
Researchers Use Ion Implantation to Make LEDs
Aug 1, 1998 — Implant Sciences Corp., based in Wakefield, Mass., has pioneered the use of ion implantation in the manufacture of gallium nitride blue light-emitting diodes (LEDs). To embed ions into a material, scientists use a linear accelerator to create a beam...
Engineers Introduce Quick Fabrication of Micro-Optics
Aug 1, 1998 — Researchers at Rochester Photonics Corp. have introduced a method for the speedy manufacture of high-NA microlenses, a development that could have an impact on telecommunications. The method, under review by the US Patent Office, involves a process...
Paint Glows Under Pressure
Aug 1, 1998 — Researchers at Purdue University have mixed fluorescent marker molecules and binders to create paints that indicate changes in temperature and pressure by changing the intensity of their fluorescence. The technique has advantages over conventional...
Caution Urged on Laser Spot Size for PRK
Aug 1, 1998 — A group of Italian researchers has uncovered evidence that lasers used during photorefractive keratectomy create stress waves that propagate within the eye itself. These waves, which are acoustic in nature, have bipolar characteristics of positive...
Tunable Spectrometer Examines Microsamples
Aug 1, 1998 — As a geologist, George Rossman often examined crystals to determine their purity. Commercially available spectrometers were able to characterize the absorption spectra of large samples, but for samples measuring between 5 and 12 µm, no device...
Laser Tweezers Take a Step Forward
Aug 1, 1998 — Imagine the neuroscientist who, surrounded by banks of equipment, is able to take a pair of tweezers and reach inside a cell to manipulate a tiny organelle or extract a virus. Such is the vision of Japanese researcher Katsuhiro Ajito, who recently...
Company Constructs Efficient, Uncooled Diode
Aug 1, 1998 — Semiconductor Laser International Corp., based in Binghamton, N.Y., has unveiled a high-power semiconductor diode laser (808 nm) with a conversion efficiency of 56 percent at room temperature. Officials presented their findings at the 11th annual...
Window Design Creates Controllable One-Way Viewing
Aug 1, 1998 — For the past 2000 years of Orthodox Judaism, men and women have worshipped separately, divided either by a solid partition or by using a balcony. Now a professor at Washington University has invented a partition that will allow one-way viewing...
Engineers Begin Installing Lasers at Hanford Observatory
Aug 1, 1998 — For years scientists have investigated ways of observing a phenomenon known as gravitational waves. As part of his theory of relativity, Albert Einstein speculated about the existence of the waves in 1916. He reasoned that the waves resulted from...
NIST to Address Optical Radiation Hazards
Aug 1, 1998 — The National Institute of Science and Technology (NIST) will hold its International Symposium on Measurements of Optical Radiation Hazards from Sept. 1-3 at its headquarters in Gaithersburg, Md. The objective of the symposium is to promote improved...
Solid-State UV Lasers Advance
Aug 1, 1998 — Photonics Industries International Inc. of Stony Brook, N.Y., has announced its latest achievement in the development of high-power UV lasers. The company has unveiled a 4.5-W solid-state device emitting in the fourth harmonic at 263 nm. Although...
Physicists Identify Single Molecules Through Vibration
Aug 1, 1998 — Physicists from Cornell University in Ithaca, N.Y., have discovered a way to identify single molecules by their vibration signature. The advance could lead to new ways to study biological molecules such as DNA. For more than a decade, scientists...
Red Cross Backs Ban on Blinding Lasers
Aug 1, 1998 — The International Red Cross has spoken out in favor of an international ban on blinding lasers -- enacted before such weapons ever reached the battlefield. The ban, which took effect July 30, outlaws the use and transfer of any laser designed to...
Aesthetic Surgery:
Aug 1, 1998 — Compared with other surgical cosmetic procedures, lasers are less invasive and enable faster recovery and often superior results. While the cost of a laser-based procedure is often higher than other methods, it has flourished in plastic surgery,...
Blood Analysis:
Aug 1, 1998 — Most blood analysis occurs in clinical laboratories, either within hospitals or at private sites. However, new technologies, including some that use photonics components, are moving this type of test out of the lab and closer to the patient Whether...
Consumer Goods
Aug 1, 1998 — The Internet, personal computers and the rise of a culture that needs to quickly send words, images and data around the world are driving improvements in telecommunications. Consumer electronics markets, especially imaging, displays and data...
Dentistry:
Aug 1, 1998 — When the Federal Food and Drug Administration allowed Premier Laser Systems Inc. in Irvine, Calif., to market the first laser for hard-tissue applications last year, many in the industry hailed it as a monumental advance. Problems soon surfaced with...
Medical Imaging:
Aug 1, 1998 — Medical imaging facilities around the world are gradually transforming themselves, becoming more and more alike as a result of the growing globalization of technology markets. As a result, and despite the range of diagnostic imaging technologies, a...
Photonics in Industry
Aug 1, 1998 — Industrial applications of photonic systems are growing steadily as manufacturers realize the benefits of light-based technologies. Laser systems help to create products by cutting, drilling and welding materials; imaging and analysis systems work...
Machining:
Aug 1, 1998 — "The future is bright" could be a manufacturer's summary of the outlook for laser machining. "Just make it affordable" is a typical response from industrial users. As usual, reality lies somewhere between the two: Laser machining systems compete...
Photonics in Medicine
Aug 1, 1998 — Photonics and medicine have been companions at least as long as doctors have used light to kill bacteria or treat psoriasis. Only recently has technology begun to catch up with physician's wish lists, however. Photonics technology now has eased into...
Military:
Aug 1, 1998 — The push to produce new military technologies that accomplish tasks better, faster and cheaper continues to create a dazzling set of options for military planners. Collaboration is increasingly the byword for new development, with defense planners...
Ophthalmology:
Aug 1, 1998 — Because it is photonic, the human eye was naturally one of the earliest places for photonics technology to intersect with medicine. Even today, photonics fills much of an ophthalmologist's tool kit. Light has treated a variety of eye-related...
Photodynamic Therapy:
Aug 1, 1998 — A relatively new technology called photodynamic therapy is revolutionizing the treatment of some types of cancer. In this treatment, a physician injects a patient with a photosensitive chemical. When activated by light, these chemicals combine with...
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