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(38,098 articles)
Popular News
Fabricating Integrated Optics with Tungstates
Apr 1, 2007 — Ytterbium-doped KY(WO4 )2 (also called double tungstate) is an excellent laser material because it has high emission and absorption cross sections as well as a small quantum defect when pumped at wavelengths readily available from diode lasers. The concept of fabricating tungstate-based integrated optical devices, incorporating a laser and other waveguide components on a tiny monolithic chip, is enticing but not straightforward. The problem is that waveguides formed by growing Yb-doped KY(WO4...
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...
Changing Mid-Infrared Wavelengths in Milliseconds
Apr 1, 2007 — Because most molecules have unique vibrational spectra in the mid-infrared region (mid-IR is often defined as the region from 3 to 30 μm), spectroscopy in that region has many applications, from remote chemical sensing to biomedicine to...
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...
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...
Ceramic Laser Boasts 82 Percent Slope Efficiency
Apr 1, 2007 — Most solid-state lasers — with the notable exceptions of glass and fiber lasers — are based on a rare-earth dopant in a crystalline host material. Over the past five years, polycrystalline ceramics have emerged as a viable alternative to the...
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...
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....
For Quantum Dots, One Laser Does Two Jobs
Apr 1, 2007 — To paraphrase an old saying, one researcher’s problem is another’s solution. That lesson has been reinforced by recent work by investigators from Max Planck Institute for Solid State Research in Stuttgart, from Paderborn University and from IFW...
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...
Image Analysis, Aided by Artists
Apr 1, 2007 — Artists don’t see objects and scenes the way a camera lens does, and understanding how the best artists work could be useful in computerized image analysis, according to preliminary research by Charles M. Falco, a professor of optical sciences at...
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...
Infrared Scene Projection: Virtual Reality for IR Sensor Testing
Apr 1, 2007 — Over the past three decades, infrared scene projection has evolved into a critical laboratory tool for evaluation of high-performance infrared imagers and their embedded algorithms. This technology projects accurate, realistic and dynamic IR...
Short-Wavelength Quantum-Cascade Lasers
Apr 1, 2007 — There exists a gap in the performance of semiconductor lasers in the 3- to 5-μm-wavelength range, a spectral range of particular interest for molecular spectroscopy as well as for applications such as directed infrared countermeasures. The 3-...
Infrared Imaging: The Short and the Long of It
Apr 1, 2007 — Where vision ends, infrared begins. Stretching from 0.7 to 1000 μm, the infrared spectrum covers a lot of ground, as do the imaging applications that make use of this part of the spectrum. These applications include biological studies,...
Telecom Meets Visible Lasers
Apr 1, 2007 — The telecom industry demands extreme reliability in lasers and photonic components, so very mature assembly and packaging techniques have evolved to meet these demands over the years. Integration of these techniques from the telecom industry has now...
Silicon Photonic Modulator Transmits Data at 30 Gb/s
Apr 1, 2007 — High-speed optical modulators are a key component for optical communications and for future optical interconnect applications. Today’s commercially available optical modulators at 10 Gb/s are based on electro-optic materials such as lithium niobate...
Loose Lips Could Sink Perps
Apr 1, 2007 — Even a whispered secret may no longer be safe. A team of researchers at the University of East Anglia in Norwich, UK, has begun a three-year project to devise computer-driven lip-reading systems that could take a videotaped conversation and...
Now You See It...
Apr 1, 2007 — For some, knowing that one is making a permanent change to his or her body is part of the allure of getting a tattoo. For others, the suspicion that one might rue such a decision in more mature hindsight makes that irrevocability a deterrent. In...
OPTICS RESOURCE
Apr 1, 2007 — Edmund Optics has released the “2007 Master Source Book,” a resource for optical system designers that is available in both print and pdf. Accompanied by illustrations, the document specifies the company’s products, including nearly 110 items that...
MOTION SYSTEMS
Apr 1, 2007 — A brochure titled “Advanced Electromechanical Systems for Aerospace- Defense-Government” has been released by Aerotech Inc. The downloadable document details custom-engineered direct-drive pedestals, high-performance direct-drive motion simulators,...
LASER DIODES
Apr 1, 2007 — A manufacturer of OEM laser diode products for analytical, biomedical and industrial applications, Power Technology Inc. has released its “2007-08 Product Selection Catalog.” The 63-page full-color resource itemizes specialty products, including...
OPTICS, LASERS
Apr 1, 2007 — Melles Griot has launched its “New Products Winter 2007” brochure. Complementing the comprehensive “Catalog X,” the downloadable publication highlights more than 20 photonic product families, including optics, lasers, hardware and instrumentation....
OPTICAL FILTERS
Apr 1, 2007 — The 47-page full-color “2007 Catalog” from Semrock Inc. details optical filters for biotechnology and analytical instrumentation, including the BrightLine fluorescence filters, among them the single- and multiband sets; the UV, bandpass and...
MACHINE VISION
Apr 1, 2007 — VDMA Machine Vision has released its updated reference work “Machine Vision 2007/08: Key Technology for Cost-Effective Automation Solutions: Applications-Products-Suppliers.” A “Who’s Who” of the German industry, the 84-page downloadable document...
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April 2024
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