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(9,093 items)
Research & Technology News
Tweezers Serve up Condensates
Sep 1, 2002 — At temperatures just above absolute zero, normally distinct atoms collapse into each other's quantum arms, forming a single quantum wave function. These Bose-Einstein condensates could form the basis of a continuous atom laser, for example, but such applications would require a constant source of ultracold atoms. A group at Massachusetts Institute of Technology in Cambridge may have a solution in using a laser to transport condensed sodium atoms from the production chamber to where they are...
Air Force Measures Refractive Index of BGG
Aug 1, 2002 — Barium gallogermanate glasses are extraordinarily strong yet still exhibit a transmission region from 0.4 to 5.0 µm, making them seemingly ideal for a vast array of large-optic applications. A team from the US Air Force Research Laboratory at...
Blue LED and Phosphor System Yield White Light
Aug 1, 2002 — By combining a blue organic LED with a down-conversion phosphor system, researchers at General Electric Global Research Center in Niskayuna, N.Y., have created a white-light device that can deliver illumination over the range of color temperatures...
Cool Ions Promise Quantum Computing
Aug 1, 2002 — In theory, a computer that employs controlled quantum states could simultaneously process tremendous amounts of data, a great advantage for applications such as factoring large numbers and searching large databases. Although it still is unclear how...
Double-Ring Laser Increases Tunability
Aug 1, 2002 — Wavelength-tunable semiconductor lasers incorporating sampled-grating distributed Bragg reflector or superstructure-grating distributed Bragg reflector designs are boosting the capacity and flexibility of optical networks. Researchers in California...
GaSe Yields High-Output IR Beyond 20 µm
Aug 1, 2002 — Using a GaSe nonlinear optical crystal, researchers at Lehigh University in Bethlehem, Pa., and the US Air Force Research Laboratory at Wright Patterson Air Force Base in Ohio have produced widely tunable mid- to far-infrared radiation that extends...
Genetics Optimizes Thin-Film Filters
Aug 1, 2002 — How do you design an optical element when you don't know what it should look like? Simple, say researchers at Fraunhofer Institut für Schicht- und Oberflächentechnik in Brunswick, Germany. Let evolution do the work. Using competing genetic...
Laser Controls Photosynthesis
Aug 1, 2002 — Photosynthesis converts sunlight into stored carbon bond energy. Metabolic processes convert this energy into direct benefits for plants and bacteria and into indirect benefits for the rest of us. Although scientists understand the basic mechanism...
Laser Induces Conformational Changes
Aug 1, 2002 — Since Louis Pasteur's investigations into the optical activity of fermentation compounds in 1848, scientists have understood that the chemical properties of a substance depend on both the type and the physical arrangement of its components....
Laser Technique Aids Spintronics
Aug 1, 2002 — A research group at Eindhoven University of Technology in Eindhoven, the Netherlands, and at IMEC vzw in Louvain, Belgium, has demonstrated an optical technique that could provide needed materials data for the development of spintronics, leading to...
Lasers Grown from Solid Arsenic
Aug 1, 2002 — Using gas-source molecular-beam epitaxy and a solid arsenic source, a team from Princeton University in New Jersey has constructed a 1.3-µm InGaAsN quantum-well laser with a characteristic temperature of 122 K and quantum efficiency of 82...
Microsprings Connect Dense Laser Array
Aug 1, 2002 — Researchers at Palo Alto Research Center in California have demonstrated a micromachined spring structure that enables optoelectronic packaging densities five times greater than is possible with current techniques. Initially developed for laser...
MIT Designs High-Brightness Laser Diode
Aug 1, 2002 — Researchers at Massachusetts Institute of Technology's Lincoln Laboratory in Lexington have designed a high-brightness laser diode that uses a slab-coupled waveguide with multiquantum-well gain regions to produce high power with nearly circular...
Multilayer Coating Shows Atomic Precision
Aug 1, 2002 — Extreme-ultraviolet wavelengths don't transmit well, even through gaseous materials like air. Consequently, the EUV lithography prototype stepper being developed by a consortium of government and semiconductor industry partners steers its 13.4-nm...
Optical System Simulates PMD
Aug 1, 2002 — Polarization mode dispersion (PMD) in legacy fiber is one of the greatest obstacles to upgrading telecommunications networks from 2.5 Gb/s to 10 and 40 Gb/s. Although means are emerging to compensate for polarization mode dispersion, it has been...
Optics Probe Quantum Catalysis
Aug 1, 2002 — In the everyday world, if you stick a $5 bill and a $10 bill in your wallet, and later pull out the $5, you can expect the other still to be $10. In the weirdness of the quantum world, of course, things are far less intuitive. A team at Universität...
Photonic Crystals Integrated into VCSELs
Aug 1, 2002 — Single-fundamental-mode vertical-cavity surface-emitting lasers (VCSELs) could benefit data transmission applications, but designing such a device to function over an entire pump range is difficult because of eventual material deformations such as...
Planar Designs Produce Compact Devices
Aug 1, 2002 — A team from the Weizmann Institute of Science in Rehovot, Israel, has created a set of compact optical devices by using diffractive optical elements deposited on a planar glass substrate. It expects the designs, which consist mainly of grating...
Plastic Makes Low-Loss Terahertz Fiber
Aug 1, 2002 — Low-loss optical fiber transparent in the terahertz region has moved a step closer to reality, thanks to researchers at the Center for Terahertz Photonics at Pohang University of Science and Technology in South Korea. The group fabricated a plastic...
Semiconductor Amplifier May Pose Alternative for DWDM
Aug 1, 2002 — The output power and emission wavelengths of most of today's dense wavelength division multiplexing (DWDM) transmitters are highly sensitive to changes in temperature and injection current, requiring costly and complex compensation methods....
Semiconductors Stick Through a Cool Marriage
Aug 1, 2002 — The ubiquitous semiconductor silicon is electronically powerful, but optically weak. It is blind, for example, in the 1.3- to 1.6-µm region of the spectrum that is useful for telecommunications applications. Germanium, on the other hand, excels at...
Space Electrons Dig Pits in Coatings
Aug 1, 2002 — One may not think that space-borne telescopes would need much protection from outside elements, but electrons and protons caught in the Earth's magnetic field can have damaging effects on the dielectric coatings of the telescopes' lenses....
Waveguides Provide Multichannel Routing
Aug 1, 2002 — Researchers from Friedrich Schiller Universität and Fraunhofer Institut für Angewandte Optik und Feinmechanik, both in Jena, Germany, have shown that thermo-optically controlled waveguide arrays can be used for multichannel routing. By...
'Lasetron' Promises Ultrafast Pulses, Strong Magnetic Fields
Jul 1, 2002 — Laser light could help scientists observe the mysterious strong-force reactions responsible for holding the nucleus of an atom together, but these occur on the timescale of about 10-21 to 10-22 s -- rendering today's fastest lasers five orders of...
Deposition Controls Refractive Index
Jul 1, 2002 — Japanese researchers at Osaka University in Suita and the Institute for Laser Technology in Osaka have demonstrated that atomic layer deposition can be used to manipulate the refractive index of an optical thin film by precisely varying the...
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July 2024
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