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(38,322 articles)
Popular News
Waveguide Generates Coherent EUV
Feb 1, 2003 — Nonlinear optics can convert laser light from one wavelength to another, but the process often requires phase matching to be efficient. Unfortunately, in high-harmonic generation of coherent extreme-ultraviolet radiation, it has not been possible to phase-match above approximately 80 eV, reducing efficiency and limiting its applications. Now researchers from JILA in Boulder, Colo., and Sofia University in Bulgaria have applied concepts from visible light conversion that allow them to extend the...
Fluorescence Detects Atmospheric NO2
Feb 1, 2003 — The atmospheric content of NO2 can serve as an indicator of air pollution, ozone depletion and even a change in climate. So it's no surprise that the Environmental Protection Agency requires states to monitor atmospheric levels of the gas. The...
Probes Enhance Microscopy
Feb 1, 2003 — Researchers at Max Planck Institut für Biochemie in Martinsried, Germany, have developed a probe design that improves the resolution of near-field scanning optical microscopes. The tip-on-aperture probes combine the benefits of aperture and...
Ladar Images in Three Dimensions
Feb 1, 2003 — Technology is increasingly important on the battlefield. Now scientists at Massachusetts Institute of Technology's Lincoln Laboratory in Lexington have developed a three-dimensional imaging ladar system for tactical applications. The system offers...
Adaptive Optics Systems Compared
Feb 1, 2003 — Increasing demands in military observation and intelligence are accelerating research in the field of adaptive optics. Researchers from Kirtland Air Force Base in New Mexico have compared the performance of adaptive optics systems employing an...
Organic LED Features Quantum Dots
Feb 1, 2003 — A quantum-dot sandwich on the menu at Massachusetts Institute of Technology in Cambridge promises to boost the performance of organic LEDs. The device, which features a layer of CdSe nanocrystals squeezed between two organic thin films, displays a...
Proteins Used in Nanoscale Templates
Feb 1, 2003 — The future of electronic and photonic devices will be based on two-dimensional arrays of quantum dots, according to a team of researchers. The scientists, based at NASA Ames Research Center in Moffett Field, Calif., the SETI Institute in Mountain...
Inspection Systems Monitor Trains
Feb 1, 2003 — The Intercity Express trains in Germany travel at speeds up to 330 km/h, faster than a jet at takeoff. To support such speeds, inspection of the wheels is crucial so that defects may be detected early and remedied immediately, but until recently,...
Laser Diode Beam Equalized into Circular Shape
Feb 1, 2003 — Using the twist effect of graded-index fiber optics, scientists at Mitsubishi Electric Corp. in Amagasaki, Japan, have converted an asymmetric laser diode beam into a circular one. Beam qualities went from M2 of 500 in the slow axis and 4 in the...
Experiment, Theory Expose Light through Slits
Feb 1, 2003 — Using near-field scanning optical microscopy and finite difference time-domain modeling, scientists at Academia Sinica in Taipei, Taiwan, have investigated the propagation of light through a slit. Their findings confirm that the transmittance of...
Triangular-Aperture Probe Boosts Resolution
Feb 1, 2003 — Researchers at Universität Münster in Germany have demonstrated a probe for near-field scanning optical microscopy that effectively doubles resolution capability without compromising brightness. They presented the triangular-aperture probe in the...
Liquid Crystal Device Corrects Wavefronts
Feb 1, 2003 — A multinational team of researchers from P.N. Lebedev Physical Institute, Samara State University and Volga Region National Academy of Information and Telecommunications, all in Samara, Russia, TU Delft in the Netherlands and the University of...
White Organic LED Has Single Emission Layer
Feb 1, 2003 — Researchers at Academia Sinica in Taipei, Taiwan, have fabricated a bright-white organic LED with a single emission layer. With a simple three-layer structure, the device generated white light with maximum brightness approaching 42,000 cd/m2 at 14 V...
Nichia, Sony Jointly Develop 405-nm Diodes
Feb 1, 2003 — Nichia Corp. of Anan, Japan, and Sony Corp. of Tokyo have announced a cooperative agreement under which they will develop 405-nm laser diodes for use in optical video recording applications. The companies hope to offer the lasers in mass quantities...
In-Well Optical System Offers Time-Lapse Seismic Imaging
Feb 1, 2003 — Weatherford International and its Optoplan group in Trondheim, Norway, have completed the installation of a multistation fiber optic seismic imaging and monitoring array in a well at Izaute Gas Storage in the southwest of France. The tubing-conveyed...
Trapping Center Controls Spin Direction
Feb 1, 2003 — In continuing work on the development of optically driven micromotors, physicists at Kyoto University in Japan have demonstrated that the location of the trapping center determines the direction of rotation of a chiral object. They reported their...
Ce:LiCAF Offers 98-mJ, 3-ns UV Pulses
Feb 1, 2003 — A team in Japan has generated 3-ns, 98-mJ pulses of 290-nm radiation with a 1 x 2 x 2-cm Ce:LiCAF power amplifier module. The researchers, from the Institute for Molecular Science in Okazaki, Tokin Corp. in Kumagaya and Tohoku University in Sendai,...
Laser Safety Board Offers Officer Exam
Feb 1, 2003 — The Board of Laser Safety in Orlando, Fla., a nonprofit organization affiliated with the Laser Institute of America, is offering a certified laser safety officer examination. Requirements for taking the exam include a four-year degree from an...
Polymer Emits Green and Red
Feb 1, 2003 — Researchers at the University of Amsterdam and at Philips Natuurkundig Laboratorium in Eindhoven, both in the Netherlands, have developed an electroluminescent polymer that emits red or green light, depending on the bias voltage. They reported on...
Aerial IR Enables Precision Agriculture
Feb 1, 2003 — To reduce contamination in groundwater and to optimize the effects of fertilization, researchers at North Carolina State University in Raleigh and in Plymouth have performed field tests of an aerial near-infrared imaging system for the site-specific...
Photodetector Offers 1-A/W Responsivity
Feb 1, 2003 — Tokyo-based Anritsu Corp. reports development of a photodetector with responsivity of 1 A/W, which it says improves optical-to-electrical signal conversion efficiency by up to 60 percent over conventional devices. The key to the performance...
CCD Camera Images Deep Space
Feb 1, 2003 — Astronomers at European Southern Observatory using the 2.2-m MPG/ESO telescope atop La Silla in Chile have combined nearly 50 hours of exposures at three wavelengths to produce a 36 x 34-arc-min image of deep space in the southern constellation...
TiO2 Film Displays Multicolor Photochromism
Feb 1, 2003 — Photochromic materials promise applications in data storage, display technology and construction, but individual materials have offered only a monochromatic response. In the January issue of Nature Materials, a team from the University of Tokyo,...
Two-Photon Process Probes Circuits
Feb 1, 2003 — Sometimes two photons are better than one. A new two-photon-absorption technique developed at the US Naval Research Laboratory in Washington for testing the radiation sensitivity of semiconductors could lead to more robust integrated circuits for...
Photonic Crystal Improves Mid-IR Generation
Feb 1, 2003 — A photonic crystal designed into a silicon wafer promises users the ability to controllably generate radiation at mid-infrared wavelengths. The emitter, developed by Ion Optics Inc. in Waltham, Mass., in conjunction with researchers at the Jet...
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August 2024
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