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(9,094 items)
Research & Technology News
Mirrors play key role in terahertz communications
Sep 1, 2006 — The potential of terahertz technology in communications applications is contingent upon the development of essential devices — such as sources and detectors — and supplementary components — such as filters, modulators and mirrors. Because of the high atmospheric and free-space path losses of terahertz radiation, communications systems will require high-directivity antennas. However, in practical applications, direct beam paths are often blocked by people or objects, creating the need for beam...
Paint-on Photodetectors Are Devised
Sep 1, 2006 — Because of their use in digital cameras and in night-vision and security systems — all growing markets — and in fiber optic communications, photodetectors are in hot demand. It’s no wonder that researchers are looking for ways to simplify the...
Raman Amplifier in Silicon Generates Electrical Power
Sep 1, 2006 — In the quest to integrate photonics and electronics in monolithic devices, several laboratories have recently demonstrated silicon Raman lasers (Photonics Spectra, November 2005, p. 52). A fundamental problem inherent in these devices has been...
Reduced Symmetry Enhances Nanoparticles
Sep 1, 2006 — Plasmon resonance, a governing factor in optical properties of metallic nanoparticles, relies heavily on particle geometry. Researchers at Rice University in Houston altered the spherically symmetric geometry of a nanoshell to explore the effect of...
Sorting Atoms for Quantum Computing
Sep 1, 2006 — Strings of laser-trapped atoms can be useful for storing and processing quantum information. Recently, researchers at the University of Bonn in Germany used an optical trapping technique to rearrange atoms in such strings with submicrometer...
Tiny Silicon Chip Provides Broadband Gain at Telecom Wavelengths
Sep 1, 2006 — Although gain at telecom wavelengths has been demonstrated in silicon-on-insulator photonic circuits, until now the effect had depended on stimulated Raman scattering. The Raman bandwidth is relatively narrow, but modern optical telecommunications...
VECSEL Generates Watt-Level Blue-Green Output
Sep 1, 2006 — Compact and efficient blue-green lasers have numerous potential uses, including in displays, data storage, spectroscopy and biomedical applications. Recently, a collaboration of researchers at the University of Arizona and at Areté Associates, both...
Wedged Etalon Simplifies Wavelength Tuning of Miniature Laser
Sep 1, 2006 — Solid-state microchip lasers, in which all the resonator elements — gain medium, resonator mirrors and, sometimes, Q-switch and/or frequency doubler — are bonded together in a monolithic block, have proved to be robust and commercially successful....
UChicago Inks $2.5B Deal to Retain Argonne Control
WASHINGTON, Aug. 2, 2006 -- The University of Chicago, through its solely owned independent entity UChicago Argonne LLC, will retain its 60-year hold on the management of Argonne National Laboratory, the Department of Energy (DoE) announced this week. The University of...
Color Center Laser Pumped with CW Diode Laser
Aug 1, 2006 — Color center lasers have long provided an alternative to dye lasers as sources of tunable radiation, but their commercial viability has diminished in recent years as competing, tunable solid-state sources have improved. Recently, researchers from...
Compact Nd:YAG Laser Developed for Airborne, Space Applications
Aug 1, 2006 — Compact, robust, efficient nanosecond sources are essential in many emerging airborne and spacecraft applications, including lidar, altimetry and remote spectroscopy, where high voltages and bulky heat exchangers are not practical. Recently, a...
Compact Nd:YAG Laser Generates 1.25 W of Blue Light
Aug 1, 2006 — Compact blue lasers have many potential applications, including optical displays and data storage, medical diagnostics and underwater communication. Recently, researchers at Tianjin University in China demonstrated a small, internally...
Planar Waveguide Transmits Mid-Infrared Radiation
Aug 1, 2006 — Because so many molecules have unique spectral signatures in the mid-infrared — generally defined as those wavelengths between several microns and several tens of microns — the evolution of integrated mid-IR components would be beneficial for the...
Simple Wavelength Meter Has Picometer Resolution
Aug 1, 2006 — There are many occasions in telecom, optical sensing and other applications when it is necessary to measure the spectral parameters of an unknown signal. Techniques of varying sophistication are used to carry this out in optical spectrum analyzers,...
Simpler Structure for Negative-Refractive-Index Media Presented
Aug 1, 2006 — Negative-refractive-index materials bend electromagnetic waves in a direction opposite that of ordinary media with positive refractive indexes, enabling a variety of novel applications, including flat lenses. A group of scientists at Iowa State...
Synergy Improves Automated Scene Recognition
Aug 1, 2006 — In the same way that human vision provides sensory input to our brains, effective computer vision could provide unprecedented data input capabilities for automated systems. Computer vision, however, involves more than pixel intensities — it requires...
The Color Purple: It Takes Three Photons
Aug 1, 2006 — Radiation in the violet and ultraviolet wavelength ranges is important for photolithography and fluorescence imaging, for future methods of three-dimensional optical storage and for other applications. There are several with which to generate this...
Study to Examine How Headlight Glare Affects Drivers, Road Safety
Jul 25, 2006 — Rensselaer Polytechnic Institute’s Lighting Research Center (LRC) in Troy, N.Y., has received a two-year, $890,012 award from the National Highway Transportation Safety Administration (NHTSA) to further their research in the causes and effects of...
ILX Offers Free Laser Reliability Tool
Jul 6, 2006 — ILX Lightwave, a Bozeman, Mont., developer of laser diode instrumentation and test systems for research, development and manufacturing, is offering version 2.01 of its Laser Reliability Workbook, free Excel-based software to analyze and plot laser...
Adaptive Lens Employs Liquid Crystal
Jul 1, 2006 — Researchers at the University of Central Florida in Orlando have constructed a tunable-focus lens by using an electric field to vary the concentration of a liquid crystal material, which creates a gradient in refractive index. The redistribution...
Continuous-Wave Solid-State Dye Laser Is Demonstrated
Jul 1, 2006 — Dye lasers have been around since the 1970s and have been instrumental in many applications, especially spectroscopy and medicine. But they are complex devices, requiring bulky pumps and tubing to circulate the liquid dye through the system. A...
Helium Is Good for Silicon Lasers
Jul 1, 2006 — Recently, several research groups demonstrated Raman lasers in silicon, perhaps bringing the union of photonics and microelectronics one step closer. To perform these experiments, however, they have had to employ complex techniques to avoid...
IR Radiation Breaks Si-H Vibrational Stretch Mode
Jul 1, 2006 — Scientists from the University of Minnesota in Minneapolis and from Vanderbilt University in Nashville and Oak Ridge National Laboratory, both in Tennessee, have achieved the room-temperature photodesorption of hydrogen from a Si(111) surface using...
Liquid Deformable Mirror Promises Fast Wavefront Correction
Jul 1, 2006 — Deformable mirrors offer the possibility of compensating for atmospheric optical distortion, an important function both for astronomy and for directed-energy military applications. Conventional deformable mirrors, which rely on the bending and...
Measuring 3-D Semiconductor Packaging
Jul 1, 2006 — Since the early 1900s, science and industry professionals have been using optical measurement and inspection for a clearer view of their products for research, development and manufacturing. These techniques of observing, measuring and analyzing...
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