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Research & Technology News
Hollow-Core Holey Fiber Is Fabricated with Polymer
Mar 1, 2006 — Polymer fibers generally are less expensive than silica fibers and often enable applications that would be economically impractical with silica. But polymers absorb strongly at wavelengths above 850 nm, primarily because of resonances with C-H vibrational bands, and thus are not suitable for infrared applications. Hollow-core polymer fibers, however, which transmit light in the air of their hollow cores rather than in the polymer, would be expected to transmit in the infrared. Recently,...
Large-Area Color Sensor Array Has Vertical Structure
Mar 1, 2006 — The future of optical sensors may be looking up as researchers investigate vertically integrated color imaging devices. A team from Forschungszentrum Jülich in Germany and Palo Alto Research Center in California has integrated amorphous silicon...
Mode-Locked Semiconductor Laser Sets Power Record
Mar 1, 2006 — Researchers at MIT’s Lincoln Laboratory in Lexington, Mass., have passively mode-locked an InGaAsP slab-coupled optical waveguide laser and generated 250 mW of average power at 1.5 μm in 10-ps pulses at a repetition rate of 4.29 GHz. The...
Multiwatt VECSEL Output Is Wavelength-Tunable
Mar 1, 2006 — Optically pumped, vertical-external-cavity surface-emitting lasers (VECSELs) produce multiwatt outputs with good beam quality, but until now their spectral characteristics have been less than optimal. Their linewidths are too wide for many...
Slow Light Observed in Biological Film
Mar 1, 2006 — The phenomenon of slow light promises to contribute to advances in all-optical switching for telecommunications. Scientists have demonstrated slow light using materials such as atomic vapors, ruby crystals and quantum dots. However, because of their...
Volumetric Bragg Grating Dramatically Cuts Laser Bandwidth
Mar 1, 2006 — The inherently broad bandwidth of solid-state lasers poses a problem for many applications — for example, spectroscopy and many other scientific applications, sensors and nonlinear optics — where nearly perfectly monochromatic light is desirable....
Study Shows That Quantum Dots Can 'Talk'
Feb 22, 2006 — ATHENS, Ohio, Feb. 22, 2006 -- Ohio University (OU) scientists who hope to use quantum dots as the building blocks for the next generation of computers have found a way to make these artificial atoms communicate. “Essentially, the dots talk to each...
BiB3O6 Generates 990-mW Second Harmonic with 52 Percent Efficiency
Feb 1, 2006 — Nonlinear optics has proved to be a valuable tool for extending the tuning range of fixed-wavelength lasers into new spectral regions. When outputs in the visible and ultraviolet are desired, two nonlinear crystals, β-BaB2O4 (BBO) and LiB3O5...
Distances of Millimeters Measured with Picometer Accuracy
Feb 1, 2006 — For those who need a ruler with exceedingly fine gradation, physicist John R. Lawall of the National Institute of Standards and Technology (NIST) in Gaithersburg, Md., has the tool for you. He has developed a technique that can measure distances of...
Electrically Driven Tunable Organic Lasers May Be Feasible
Feb 1, 2006 — Solid-state organic dye lasers that use multiple-prism grating-tunable laser oscillators require another laser as an excitation source. Now researchers at Eastman Kodak Co. in Rochester, N.Y., have reported spatially coherent emission and partially...
Hybrid Nanowire Components Show Promise for Photonics
Feb 1, 2006 — To advance the development of ultrasmall nanowire-based photonic devices, a research team at Harvard University in Cambridge, Mass., has incorporated single CdS nanowires into lithographically defined photonic crystal and “racetrack” microresonator...
Optical Vortex May Enable Imaging of Extrasolar Planets
Feb 1, 2006 — Despite the nursery rhyme, that star twinkling in the night sky is far from little. Moreover, any planets that orbit the star are exceedingly dim and tiny in comparison, making it difficult for astronomers to spot such extrasolar...
Quantum Memories Demonstrated
Feb 1, 2006 — Research teams from Harvard University in Cambridge, Mass., and from Georgia Institute of Technology in Atlanta have independently developed quantum memories, clouds of atoms that store single photons and allow them to be retrieved on demand. The...
Short-Wave IR Tunable Filters Fabricated on HgCdTe
Feb 1, 2006 — Researchers from the University of Western Australia in Crawley, in collaboration with DRS Infrared Technologies LP in Dallas and the University of Texas at Austin, have designed and fabricated a tunable Fabry-Perot resonator multispectral imaging...
Silver Halide Fibers Under Development for Mid-IR Imaging
Feb 1, 2006 — Continuing their efforts to develop fibers that transmit mid-IR radiation for endoscopic imaging applications in medicine and industry, a team of scientists at Tel Aviv University in Israel has fabricated 2- and 0.7-mm-diameter bundles of silver...
Single-Lens System Offers Simultaneous Fields of View
Feb 1, 2006 — Optical zoom lenses can provide variable magnification, so a single system can generate images of low magnification and large field as well as images with high magnification and a narrow field. It had not been possible to provide high magnification...
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....
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...
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