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(9,094 items)
Research & Technology News
Imaging the Eight-Fold Way
Apr 1, 2007 — Although she was not talking about cameras, the Duchess of Windsor nonetheless had it right: You can never be too thin — at least for certain applications. For example, surveillance cameras for miniaturized unmanned aerial vehicles cannot be big and bulky. The same is true for cameras in portable infrared telescopes. However, shortening the length of conventional imaging optics degrades resolution and decreases light collection. By using multiple concentric zone reflectors and an annular...
Phase-Matching Technique for High-Harmonic Generation
Apr 1, 2007 — Researchers at the University of Colorado at Boulder have shown how to accomplish quasi-phasematching in ionized gases, thereby enabling enhancements by two orders of magnitude in the conversion efficiency of high-order harmonic generation. They...
Phosphorescent Acrylates Could Permit Nonelectric Illumination
Apr 1, 2007 — Lights and signs that phosphoresce brightly for an extended period could provide individuals with a sense of security when the electricity fails. Establishment of a full-color spectrum in these systems, however, requires red, green and blue sources....
Producing Patterns on a Curve
Apr 1, 2007 — In the past, researchers wanting to perform lithographic microfabrication on a nonflat lens or other optical surface have been thrown a curve — literally. Standard lithographic technology cannot do the job. Investigators, therefore, were restricted...
Q-Switching a Fiber Laser with Another Laser
Apr 1, 2007 — When an application requires precise control of the timing and frequency of a Q-switched laser’s pulses, active Q-switching is the only way to go. However, for the many applications that don’t need such temporal control, passive Q-switching is often...
The Mysterious Motion of Long AC Arcs Understood
Apr 1, 2007 — The motion characteristics of long AC arcs in atmospheric air have been explained by researchers who say that the findings could result in improved safety and stability for power systems. A typical pattern of a long AC arc burning in atmospheric...
Three Fiber Lasers Are Better Than One
Apr 1, 2007 — As scientists and engineers push fiber lasers to ever-higher output powers, they have encountered severe nonlinear effects that are a stubborn roadblock to further progress. The fundamental problem is the high power density propagating for long...
A New Approach to Narrowband Visible and Ultraviolet Sources
Mar 1, 2007 — From green laser pointers to sophisticated surgical instruments, frequency-doubled solid-state lasers have found countless successful applications during the past several decades. Now, by combining the mature technology of frequency doubling with...
Active Feed-Forward Improves Linear Optics Quantum Computing
Mar 1, 2007 — In one-way quantum computing, applying a feed-forward technique — in which each measurement is dependent on previous results — helps to surmount quantum measurement randomness. Researchers from the University of Vienna in Austria, Harvard University...
Biodegradable Holey Fiber Enables Drug Delivery
Mar 1, 2007 — Scientists at École Polytechnique de Montréal have demonstrated what they believe is the first biodegradable microstructured (holey) optical fiber that is capable of multiple optical and/or microfluidic functionalities. They envision many diverse...
Blue Fiber Laser Generates More Than 200 mW
Mar 1, 2007 — Small blue lasers are difficult to come by but have many interesting applications, including laser displays, fluorescence microscopy, flow cytometry and spectroscopy. Recently, scientists at the Center for Optics, Photonics and Lasers (COPL) in...
Building a Room for a Bacterium
Mar 1, 2007 — University of Texas at Austin researchers Bryan J. Kaehr and Jason B. Shear have developed a way to rapidly generate microscale patterns in biomaterials using a technique dubbed mask-directed multiphoton lithography. Among other applications, they...
Electrically Tunable Bragg Gratings in Polymer Fiber
Mar 1, 2007 — The capability of fiber Bragg gratings to reflect only resonant wavelengths while transmitting all others has found numerous applications in telecom, optical sensing and other technologies. Because the resonant wavelengths can be shifted by heating...
European Group Develops Plasmonics
Mar 1, 2007 — The Centre Suisse d’Électronique et de Microtechnique SA of Neuchâtel, Switzerland, is leading the European project PLEAS, Plasmon Enhanced Photonics, which aims to move plasmonics beyond the academic arena to a key position in the development of...
Imager Eases Analysis of Space Weather
Mar 1, 2007 — There’s more to bad weather than just wind and rain. When flares or coronal mass ejections occur on the surface of the sun, ensuing blasts of radiation cause storms in the Earth’s ionosphere, more than 100 km above land and sea. In fact, storms...
Mid-Infrared Pulses Generated from Eye-Safe Fiber
Mar 1, 2007 — Mid-infrared sources are crucial in several applications, including molecular spectroscopy and military countermeasures, and many investigators around the world are pursuing approaches to practical, efficient sources in this spectral region. These...
Taking Raman Spectroscopy to Other Worlds
Mar 1, 2007 — When future rovers go to Mars or other planets, equipping them with instruments capable of deep-UV Raman spectroscopy will give them a better chance of answering questions about their surroundings. That is the conclusion arrived at by a group of...
Two-Micron Fiber Laser Has Potential for
Military and Civilian Applications
Mar 1, 2007 — Lasers emitting in the two-micron spectral region have important applications in medicine, spectroscopy and military countermeasures. Traditionally, these applications have relied on holmium-doped crystalline YAG or YLF lasers, but these require...
Ultralow Threshold Reported for Raman Laser
Mar 1, 2007 — How low can you go? In the quest for ever more efficient Raman lasers, investigators have achieved thresholds that have been below a milliwatt by resonating both pump and laser wavelengths in a fused-silica microsphere. But now scientists at...
High-Power Nd:YAG Laser Pumped Directly to Upper Level
Feb 1, 2007 — A quarter century ago, Nd:YAG lasers were capable of optical efficiencies of only a few percent at best. Pump photons, produced by high-power arc lamps, were lost to glass flow tubes, and the water in them was lost to the walls of the pump cavity...
Laser Ties Optical Fiber in a Knot
Feb 1, 2007 — Minuscule microlasers have numerous potential applications in information technology and communications as well as in medical diagnostics. Scientists in several laboratories around the world have demonstrated ultracompact lasers in microdisks and...
Matchmaking: Holey Fiber Meets Conventional Fiber
Feb 1, 2007 — Holey fibers — or photonic crystal fibers — possess many characteristics that make them potentially useful in a host of applications. They can be designed with customized dispersion characteristics, highly nonlinear properties, or to propagate only...
MEMS Microlens Has Adjustable Focal Length
Feb 1, 2007 — MEMS photonic devices have proved useful in many applications, including telecom, displays and imaging. But developing an efficient and reliable microlens, one whose focal length can be easily adjusted, is a goal that has eluded engineers. Recently,...
Metamaterials Reflect Visible Light
Feb 1, 2007 — Metamaterials could permit the creation of ultrahigh-resolution lenses and could even make cloaking devices a reality. To do so, they must reflect visible light. In the past, they could operate only in the microwave and far-infrared ranges, but have...
Microdisk Resonance Tuned with Optical Signal
Feb 1, 2007 — All-optical switches — those in which one group of photons alters the flow of other photons — are an essential component of many next-generation systems, from optical computers to transparent optical networks. Recently, researchers at Université...
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