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(38,322 articles)
Popular News
External-Cavity Laser Diode Offers 300 mW
May 1, 2003 — Fedor N. Timofeev and Raman Kashyap of PhotoNova Inc. in Pointe Claire, Quebec, Canada, have reported 300-mW stable single-frequency operation near 976 nm from a laser diode with an external fiber cavity. They described the device, which displayed few mode hops over drive currents from 0 to 500 mA, in the March 24 issue of Optics Express. The setup employed a 980-nm pigtailed pump laser, with a length of ytterbium-doped fiber and a fiber Bragg grating as the external cavity. Maximum...
Nd:YAG Produces 2.8 W of Blue Light
May 1, 2003 — Researchers at the Institut für Laser Physik at Universität Hamburg in Germany have set a record for blue CW power generated from a diode-pumped solid-state laser, using a new nonlinear crystal, BiB3O6 (BiBO), to frequency-double the 946-nm line of...
External-Resonator Raman Laser Emits 1.3 W
May 1, 2003 — In the last 20 years, a host of wavelengths have become available from conventional lasers, and manufacturers are offering systems that can be tuned to virtually any wavelength from the short ultraviolet to the long infrared. In general, these...
Setup Combines Ytterbium Fiber Lasers
May 1, 2003 — A group at Massachusetts Institute of Technology in Cambridge is combining the output of ytterbium fiber lasers using a master-oscillator power-amplifier configuration to produce a single beam for materials processing and other high-power...
Getting the Most Out of Your Image
May 1, 2003 — For developers of scientific or industrial image-processing applications, robustly and accurately extracting the vital information contained in each pixel presents a constant challenge. Recent developments in camera, frame grabber and algorithm...
Maximize Color and Contrast in Multimedia Images
May 1, 2003 — After scanning a color photograph into a computer, one assumes it will reproduce well on the screen and on those to which it has been sent via the Internet. The ease with which this can now be done, however, conceals the complexity of the underlying...
CWDM: A Low-Cost Alternative for Increased Capacity
May 1, 2003 — Cost savings realized in deploying coarse wavelength division multiplexing (CWDM) systems have helped this transport architecture gain acceptance as a viable alternative to dense WDM (DWDM) in short-haul metro-area and enterprise networks. As CWDM...
Never Too Thin
May 1, 2003 — To paraphrase the Duchess of Windsor, displays can never be too thin or too rich. Flat panel displays take up less room and consume less power than their cathode-ray-tube kin. However, in the past, flat panel displays were too expensive and their...
Optical Engineering for Beam-Matrix Art
May 1, 2003 — Artistic use of lasers can take various forms. The best-known form is the laser show, which is typically accompanied by music, and uses scanning, diffraction and other effects to project constantly changing patterns on screens or smoke. Another...
Lasers Play a Bigger Role in Biomedical Applications
May 1, 2003 — The laser is now well-established as a critically enabling tool in biomedical applications that range from research and clinical work at the molecular level to direct human applications for medical conditions such as strokes.These techniques employ...
Taking a Closer Look at Camera Specifications
May 1, 2003 — Purchasing a camera for high-performance imaging applications can be confusing and time-consuming. Manufacturers lack clear and consistently defined specifications, which makes it difficult to compare one camera with another based on specs alone....
In Search of Calcium Fluoride
May 1, 2003 — Anyone who has ever owned a PC is familiar with the problem of technological obsolescence. Faster models hit the market almost before people have had the opportunity to turn on their new computers. What many people don’t know is that rapid...
3-D Structures Offer Efficient Mixing
May 1, 2003 — Complex three-dimensional structures of 10- to 300-µm-diameter microchannels fabricated in a photocurable resin mix fluids more efficiently and in a smaller footprint than 2-D and 1-D devices, report researchers from the University of Illinois at...
Surface-Quenched Hairpins Detect DNA
May 1, 2003 — A biosensor developed at the University of Rochester in New York that uses its gold substrate to quench fluorophore-functionalized DNA hairpins on the surface promises to detect complementary sequences at femtomolar concentrations. The researchers...
Energy Transport Observed
May 1, 2003 — Using near-field optical microscopy to excite fluorescent nanospheres atop chains of rod-shaped silver nanoparticles, a team of scientists at California Institute of Technology in Pasadena and at the University of Southern California in Los Angeles...
Cantilever Epitaxy May Improve LEDs
May 1, 2003 — Researchers at Sandia National Laboratories in Albuquerque, N.M., have developed a process for depositing layers of GaN that span etched trenches in sapphire substrates. The process, which they call cantilever epitaxy, may improve the performance of...
Photobleaching Offers Coded Microspheres
May 1, 2003 — Using a technique they call spatial selective photobleaching, scientists at Ghent University and at Tibotec in Mechlin, both in Belgium, are producing optically encoded polymer microspheres that may find use in biomedicine, chemistry and...
Castings Replicate Si-Template Optical Properties
May 1, 2003 — Sensing and drug-delivery applications may someday benefit from a technique that replicates the optical properties of a porous Si template in polymer castings. The fabrication process, devised at the University of California, San Diego, derives from...
Polymer Incorporates Alq3 for Organic LEDs
May 1, 2003 — As the market for alternative display technologies grows, aluminum tris(8-hydroxyquinoline), or Alq3, continues to enjoy the attention of researchers for its excellent optical properties. Unfortunately, this small-molecule organic LED material,...
Stoichiometric Crystal Promises Laser Uses
May 1, 2003 — A team of researchers from Germany and Spain is investigating the properties of a stoichiometric crystal for use in face-cooled lasers, such as thin-disc and microchip designs. The crystal, KYb(WO4)2 -- or KYbW -- has demonstrated 20 mW of 1068-nm...
Soft Lithography Reproduces Microlenses
May 1, 2003 — As we move from the electronics to the photonics age, micro-optics are finding a place in more and more applications. Now researchers have introduced a soft lithography process that they hope will enable the low-cost, mass production of microlenses...
Ultraviolet Telescope to Observe Galaxies
May 1, 2003 — CAPE CANAVERAL, Fla., May 1 -- NASA launched its sky-mapping satellite, the Galaxy Evolution Explorer, on Monday on a mission to map the ultraviolet universe. The Galaxy spacecraft is equipped with a telescope that records in the near- and...
Imaging Technique Measures Brain Tumor Sodium Levels
May 1, 2003 — BALTIMORE, May 1 -- In what is believed to be a first-of-its-kind study, Johns Hopkins University researchers have used magnetic resonance imaging (MRI) to measure sodium concentrations in the cells of malignant brain tumors. Because growth of such...
Daily News Briefs
May 1, 2003 — Laserscope, a developer of medical lasers and advanced fiber optic devices, announced it has received a patent for the technology and applications for its GreenLight PV (formerly the Niagara PV) laser. US Patent 6,554,824, "Methods for Laser...
Fusion Imaging Studied for Prostate Cancer
Apr 30, 2003 — PRINCETON, N.J., April 30 -- Combining prostate cancer images with dual-modality imaging, or fusion imaging, can help detect the location and extent of prostate cancer, said researchers at University Hospitals of Cleveland, Case Western Reserve...
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August 2024
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