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Research & Technology News

Tungstate Laser Operates in Waveguide Mode
Feb 1, 2006 — Optically pumped waveguide lasers have an inherent advantage over conventional lasers in that the overlap between the pump light and the laser mode is necessarily quite high because both are constrained to propagate together in the narrow waveguide. Among optically pumped lasers, rare-earth-doped KY(WO4)2 (KYW) lasers show great promise because of their unusually high absorption and emission cross sections. Recently, scientists in Europe produced the best of both worlds by demonstrating what...
Whispering Gallery Resonator Spans an Octave
Feb 1, 2006 — White-light resonators are resonant across a broad, continuous swath of frequencies — perhaps as much as an octave — but still retain a high quality factor, or Q, at all of the resonant frequencies. Recently, scientists at California Institute of...
Latest Products, Technology Unveiled at CES
Jan 6, 2006 — LAS VEGAS, Jan. 6, 2006 -- The 2006 International Consumer Electronics Show (CES), the world's largest consumer technology tradeshow, opened its doors yesterday with 2500 exhibitors showcasing the latest products and services in audio, digital...
New Products, Technology Unveiled at CES
Jan 6, 2006 — LAS VEGAS, Jan. 6, 2006 -- The 2006 International Consumer Electronics Show (CES), the world's largest consumer technology tradeshow, opened its doors yesterday with 2500 exhibitors showcasing the latest products and services in audio, digital...
CW Yb:LuVO4 Laser Produces More Than 1 W
Jan 1, 2006 — The vanadate crystals YVO4, GdVO4 and LuVO4 are good host materials for diode-pumped neodymium-doped lasers because they have large absorption and emission cross sections, have broad bandwidths and naturally lase in a single...
Electronics Integrated with Photonics in 3-D on Silicon Chip
Jan 1, 2006 — Researchers at the University of California, Los Angeles, have realized the three-dimensional integration of electronics and photonics in a monolithic silicon-on-insulator substrate. The photonic device was buried inside the silicon, while a...
Femtosecond Technique Probes Photochemistry
Jan 1, 2006 — After seven years of effort, researchers at the University of California, Berkeley, have developed a femtosecond stimulated Raman spectroscopy instrument capable of illuminating chemical reaction mechanisms that take place in less than a picosecond....
Fiber Laser Generates Multiple Wavelengths
Jan 1, 2006 — Multiwavelength fiber lasers are important for testing wavelength division multiplexing telecommunications systems and for other applications in metrology and sensing. Unfortunately, there is a fundamental obstacle standing in the way of...
Integrated Fiber Monitors Itself for Thermal Leakage
Jan 1, 2006 — If there are failures in the high-power fiber optic lines used in medical, industrial and defense applications, the problems can be huge. It is, therefore, important to be able to predict and prevent such failures. Researchers at Massachusetts...
Nanostructured Material Exhibits Negative Refractive Index in the Visible
Jan 1, 2006 — A team of investigators at the University of Manchester in the UK, the Institute of Microelectronics Technology in Chernogolovka, Russia, and Aston University in Birmingham, UK, has reported a real part of the refractive index of −0.7 at...
Novel Camera Employs Microlenses
Jan 1, 2006 — Researchers at Stanford University in California have found that one lens may be good but that thousands of lenses are better for taking pictures. The group at Pat Hanrahan’s lab has developed and field-tested under a variety of conditions a...
Photonic Crystal Array Lases at Stanford
Jan 1, 2006 — Lasers based on nanocavities in photonic crystals have been widely investigated because of the high density of states associated with these tiny devices, which leads to low lasing thresholds and to high direct-modulation rates. But their drawback to...
Photonic Rubber Sheet Displays Tunable Structural Color
Jan 1, 2006 — An elastic photonic crystal developed by scientists at the National Institute for Materials Science in Tsukuba, Japan, demonstrates a shift in its apparent color under an applied strain, suggesting its utility in strain imaging and mechanical...
Self-Assembled Nanoprisms Form Smectic Crystal
Jan 1, 2006 — Building nanometer-scale devices such as photonic crystals requires assembly techniques of unprecedented accuracy. Developing these techniques can be as difficult as designing the devices and, thus, self-assembly methods — in which the components of...
Sensitive Intrusion Detector Relies on Fiber Optic Reflectometer
Jan 1, 2006 — Optical time-domain reflectometry (OTDR) is a well-established technique for detecting faults and discontinuities in long stretches of optical fiber. A short optical pulse is injected into one end of the fiber, and as it travels along the fiber’s...
Silicon Laser Relies on Quantum Wells
Jan 1, 2006 — Silicon-based lasers have been much in the news recently, as some researchers have explored Raman lasers in silicon, while others have pursued doping or the introduction of a lasing element into silicon. These developments hold the promise of...
Simple Technique Tunes a Fiber Laser’s Wavelength
Jan 1, 2006 — The broad spectral linewidths of fiber lasers make them attractive candidates for versatile, wavelength-tunable sources, but the wavelength-tuning mechanisms — often involving multimode fiber Bragg gratings or other complex components — are neither...
Software Fills the Blanks in Imagery
Jan 1, 2006 — As satellite-borne sensors have become more sophisticated, a wealth of data has become available to Earth scientists. Unfortunately, the level of detail these sensors afford carries a downside: It has become much more difficult and computationally...
Three-Color Ink Proposed for Electronic Paper
Jan 1, 2006 — The low cost and low power requirements of electronic paper displays promise to make them suitable for applications from variable price tags to wearable health monitors. But for the technology to fully realize this potential, the electronic ink...
Tunable Slow Light Achieved in Silicon Photonic Crystal
Jan 1, 2006 — Scientists at IBM’s T.J. Watson Research Center in Yorktown Heights, N.Y., have carefully measured the slowing of light in a silicon photonic crystal and have demonstrated that the amount of slowing can be controlled by heating the crystal. Slow...
Customized Microscope Helps Track Cells
Dec 28, 2005 — BERKELEY, Calif., Dec. 28 -- Researchers from the University of California at Berkeley using a customized atomic force microscope (AFM) have discovered new evidence for how the fibrous scaffolding within human cells responds to obstacles in its...
Semiconductor Consortium Funds Nanoelectronics Research Centers, Grants
Dec 8, 2005 — RESEARCH TRIANGLE PARK, N.C., Dec. 8 -- Seeking to accelerate nanoelectronics research at US universities to benefit the long-term needs of the semiconductor industry, a consortium of companies known as the Nanoelectronics Research Corp. (NERC)...
European Technology Platform Launched for Photonics
Dec 2, 2005 — BRUSSELS, Belgium, Dec. 2 -- More than 200 photonics industry representatives, researchers and policymakers from 16 European member states and 120 companies celebrated the launching of the European Technology Platform (ETP) Photonics21 in Brussels...
Photonics Platform Launched in Europe
Dec 2, 2005 — BRUSSELS, Belgium, Dec. 2 -- More than 200 photonics industry representatives, researchers and policymakers from 16 European member states and 120 companies celebrated the launching of the European Technology Platform (ETP) Photonics21 in Brussels...
Cone-Shaped Brewster Surface Produces Radially Polarized Beam
Dec 1, 2005 — Radially polarized laser beams — in which the electric-field vector is always oriented in the radial direction — may be advantageous for the optical trapping and manipulation of small particles. Although many techniques for generating radially...

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