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Detector Sensitive from 800 nm to Far-IR
Jun 1, 2005 — Infrared detection is used in industrial, surveillance, medical and defense applications. Infrared emissions provide a direct insight into an object's temperature, but the shape, size and surface characteristics of an object influence the signal, so that the first-order relation between IR emission and temperature is not exact. If an object's IR emission is measured at several wavelengths, it is possible to eliminate surface and shape effects and to reconstruct its temperature. Doing so,...
Femtosecond Laser Directly Writes Computer-Generated Holograms
Jun 1, 2005 — The unique characteristics of holograms are attributable to their ability to store both intensity and phase information. Traditional holograms are created by recording the interference pattern generated by a reference beam and by another beam...
Fiber Ring Laser Generates 1 W in a Single Frequency in Eye-Safe Region
Jun 1, 2005 — Fiber laser oscillators historically have not been particularly good sources of single-frequency radiation, primarily because their length makes it difficult to discriminate between closely spaced longitudinal modes. Although single-frequency...
High-Speed Photography Reveals Secrets of Splashing
Jun 1, 2005 — Harold E. Edgerton’s stroboscopic photographs of the "coronet" splash formed by a droplet of milk falling onto a saucer have become iconic. Now physicists at the University of Chicago have found that the formation of the splash depends on the...
Low-Light-Level Optical Transistor Demonstrated
Jun 1, 2005 — Scientists at Duke University in Durham, N.C., have demonstrated an optical switch capable of switching microwatt light beams employing beams on the order of nanowatts or hundreds of picowatts. Such devices are the optical analogues of electrical...
Noise in Quantum Cascade Lasers Investigated
Jun 1, 2005 — Scientists from Technische Universität Darmstadt and Fraunhofer Institut für Angewandte Festkörperphysik in Freiburg, both in Germany, have determined that the dependence of the intensity noise on optical power in quantum cascade lasers differs from...
Phase Mismatch Leads to Intensity-Modulated Blue Laser
Jun 1, 2005 — Laser engineers usually worry about maintaining phase matching in frequency-doubled lasers, but now researchers at Technische Universität Kaiserslautern in Germany have taken advantage of the narrow tolerance for phase mismatch in a periodically...
Polarized, Single-Mode Fiber Laser Generates 633 W
Jun 1, 2005 — Although unpolarized fiber lasers have generated output in excess of 1 kW with high-quality beams, polarized outputs have been significantly lower, on the order of 300 W. Polarized outputs are important, however, in many applications, including...
Polymer Bragg Gratings Filled to Order
Jun 1, 2005 — Highly reflective Bragg gratings using a photopolymer have been developed by a group of researchers at State University of New York (SUNY) at Buffalo, and at Science Applications International Corp. in Dayton and the US Air Force Research Laboratory...
Silver Superlens Achieves 60-nm Resolution
Jun 1, 2005 — Scientists at the University of California, Berkeley, have realized a resolution of 60 nm using a film of silver as a superlens, and they demonstrated it by imaging the word "NANO" and an array of nanowires. Researchers imaged the word "NANO"...
Wavelength Tuning of MEMS VCSEL Proposed
Jun 1, 2005 — Engineers at the University of California, Berkeley, have designed and analyzed -- but not built -- a microelectromechanical system (MEMS) vertical-cavity surface-emitting laser (VCSEL) whose wavelength could be tuned using a unique piezoelectric...
Condensates Coaxed to Exhibit Unique Interference
May 1, 2005 — Thomas Young's classic setup for the demonstration of interference features light from one source incident on two vertical slits because the phenomenon occurs only if the light from the slits has a well-defined relative phase. Now a group at the...
Diamond Grown on Optical Fiber for Waveguiding
May 1, 2005 — Scientists at the University of Melbourne in Australia report in the March 28 issue of Applied Physics Letters the waveguiding of the nitrogen-vacancy color center fluorescence in diamond microcrystals grown on optical fiber. They grew the diamond...
Fiber Ring Laser Generates 50 Simultaneous Wavelengths
May 1, 2005 — A scientist at Exfo Electro-Optical Engineering Inc. in Vanier, Quebec, Canada, has demonstrated a simple fiber ring laser capable of generating 50 simultaneous wavelengths uniformly spaced at 50 GHz between 1308 and 1322 nm. Such a laser could be...
Gas Sample Cell Based on Photonic Bandgap Fiber
May 1, 2005 — By splicing a single-mode fiber to each end of a gas-filled, hollow-core, photonic bandgap fiber, researchers at the University of Bath in the UK have created a gas cell with unprecedented interaction efficiency between the sample and light. They...
Ink-Jet Technique Produces Microvessels and Microlenses
May 1, 2005 — Researchers at Max Planck Institut für Polymerforschung in Mainz and Universität Siegen, both in Germany, have fabricated microvessels and microlenses using an ink-jet method that deposits droplets of a solvent onto a polymer substrate. The approach...
Multiwavelength Laser Utilizes Erbium-Doped Fiber Amplifier
May 1, 2005 — Multiwavelength lasers are important for testing wavelength division multiplexing telecommunications systems and for other applications in metrology and sensing. Two readily available gain media have the broad gain bandwidth necessary for a...
Plasma Treatment Fine-Tunes Micro-Ring Resonance
May 1, 2005 — Waveguide micro-ring resonators are attractive components for many integrated optical applications, such as filtering, dispersion compensation, multiplexing and wavelength conversion. When employed as a notch filter, for example, a micro-ring...
Silicon Nanowires Make Ultratiny Directional Couplers
May 1, 2005 — As several laboratories around the world pursue silicon lasers, other researchers are exploring a variety of silicon-based optical components. Directional couplers are the basic building blocks for a host of optical devices, from multiplexers to...
Silver Superlens Enables Subdiffraction-Limit Imaging
May 1, 2005 — Lens resolution can never be too flat or too thin. At least, that's one conclusion that can be drawn from recent research at the University of Canterbury in Christchurch, New Zealand. Electrical and computer engineering associate professor Richard...
Theorists Propose an All-Optical Transistor
May 1, 2005 — Optical computers -- computers in which photons replace the electrons of today's machines -- are expected to bring huge improvements in terms of compactness and speed and to yield unimaginable improvements in technology. Optical computing exists...
Thinking Beyond Stripes in Flat Panel Displays
May 1, 2005 — Thomas L. Credelle, vice president of engineering at Clairvoyante Inc. in Cupertino, Calif., has spent the past few years trying to convince flat panel display manufacturers that they do not have to resort to massive investments in next-generation...
CdS/ZnS Nanocrystals Display Blue Lasing
Apr 1, 2005 — Scientists at Massachusetts Institute of Technology in Cambridge have observed room-temperature amplified spontaneous emission tunable between approximately 450 and 500 nm and lasing centered near 480 nm from optically pumped CdS/ZnS composite...
Coherent 1-nm X-Rays Generated in Helium
Apr 1, 2005 — Harmonic generation has been a workhorse of the photonics community for decades, creating coherent short-wavelength light from longer-wavelength lasers. Today, the market is awash with 532-nm lasers -- including green laser pointers -- whose output...
Crylas GmbH Designates North American Agent
Apr 1, 2005 — Crylas GmbH of Berlin, a supplier of passively Q-switched diode-pumped solid-state lasers for OEM, research and life sciences applications, has appointed Market Tech Inc. of Scotts Valley, Calif., as its exclusive North American distributor. Market...

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