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(9,094 items)
Research & Technology News
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 systems feature an Nd:YAG laser operating at 1.06 µm and employ frequency-doubling crystals and optical parametric oscillators to reach the desired wavelength. Ongoing research, however, indicates that another nonlinear process, stimulated Raman...
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...
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...
Optical Switch Designed for the Disabled
May 1, 2003 — Researchers at the National Electronics and Computer Technology Center in Pathumthani, Thailand, led by Sarun Sumriddetchkajorn, have developed an optical touch-activated switch to replace mechanical switches for use by disabled people. They...
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...
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,...
See-Through Thin-Film Transistor Unveiled
May 1, 2003 — Transparent electronics may seem the stuff of science fiction, but engineers from Oregon State University and Hewlett-Packard Co. in Corvallis, Ore., have developed zinc-oxide-based thin-film transistors that they hope will find applications in...
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...
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...
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...
3-D Crystals Produced by Microassembly
Apr 1, 2003 — Employing techniques that were developed for manufacturing integrated circuits, researchers in Japan have constructed three-dimensional photonic crystals from layers of patterned semiconductor plates. The method points to the development of more...
All-Optical Frequency Shifter Demonstrated
Apr 1, 2003 — As the demand for speed and bandwidth in communications networks increases, new approaches to switching and routing are under study. Now researchers at the University of Illinois at Urbana-Champaign have developed an all-optical device that rapidly...
Dielectrophoresis Builds Photonic Crystals
Apr 1, 2003 — Scientists at the University of Delaware in Newark, Carnegie Mellon University in Pittsburgh and North Carolina State University in Raleigh have assembled one- and two-dimensional photonic crystals by exposing microspheres to an alternating electric...
Er:Fiber Laser Suitable for Optical Clocks
Apr 1, 2003 — Scientists at Technische Universität München in Garching and at Ludwig Maximilians Universität München in Munich, both in Germany, have presented an erbium-doped fiber laser system that offers 110 mW of linearly polarized output power in 65-fs...
Femtosecond Laser Probes Plasma Formation
Apr 1, 2003 — Pump-probe experiments employing femtosecond lasers have exposed the dynamics of numerous ultrafast phenomena. Researchers at Univer-sité Claude Bernard Lyon 1 in Villeurbanne, France, and the US Army Research Laboratory in Adelphi, Md., have...
Femtosecond Techniques Herald Attophysics
Apr 1, 2003 — In pursuit of shorter and shorter sources of illumination to probe dynamic physical phenomena, researchers at Technische Universität Wien in Austria and at Max Planck Institut für Quantenoptik in Garching, Germany, have used femtosecond techniques...
Fiber Sensors Probe Engine
Apr 1, 2003 — As carmakers try to reduce the harmful emissions from gasoline-powered engines, efforts focus on controlling engine performance using data from sensors. A team from Texas A&M University in College Station and Fiber Dynamics Inc. in Bryan, Texas,...
Filter Enables 23-Channel Laser
Apr 1, 2003 — Transmitters for dense wavelength division multiplexing (DWDM) consist of banks of lasers, with one laser for each channel. It would be nice if a single laser could produce a comb of frequencies exactly aligned with the channels. Researchers at Bell...
Force Networks Examined with Photoelastic Imaging
Apr 1, 2003 — How fast granular materials flow is related to how elastic energy in the materials is stored and released. Researchers at Duke University in Durham, N.C., have used a polariscope, a light source and a video camera to examine the movement of...
Freon Improves Laser-Ablation Spectrometry
Apr 1, 2003 — To reduce the incidence of elemental fractionation and improve the accuracy of laser ablation induction-coupled plasma mass spectrometry for the isotopic analysis of geological samples, Takafumi Hirata of Tokyo Institute of Technology suggests the...
Gratings Offer New Breed of Tunable Laser
Apr 1, 2003 — Researchers worldwide are pursuing several approaches to building tunable lasers that will enable future telecom systems to be quickly reconfigured for maximum transmission efficiency. Some approaches involve changing the feedback frequency of the...
Heat Treatment Produces Fiber for Sensors
Apr 1, 2003 — In pursuit of a more economical fiber for evanescent field sensors, researchers in Australia have determined that annealing standard commercial telecommunication fiber yields a suitable refractive-index profile for such applications. The...
Laser Produces T-Ray Diffractive Elements
Apr 1, 2003 — To ease the integration of components for terahertz spectroscopy and signal processing, a team at Massachusetts Institute of Technology in Cambridge has fabricated integrated diffractive elements in LiNbO3 using femtosecond pulses from an amplified...
Molecular Self-Assembly Yields Giant Lattice
Apr 1, 2003 — A group of researchers at the University of Pennsylvania in Philadelphia and the University of Sheffield in the UK has fabricated a liquid crystal lattice that is one of the most complex structures ever produced through molecular self-assembly. The...
Near-Field Raman Offers 25-nm Resolution
Apr 1, 2003 — Researchers at the University of Rochester in New York, Portland State University in Oregon and Harvard University in Cambridge, Mass., have reported a spatial resolution of 25 nm in their study of the near-field Raman imaging of single-walled...
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