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Research & Technology News
Vibrometer Makes Waves in Testing
Feb 1, 2002 — When it comes to making optical fiber for use in sensors that measure vibration and acoustic pressure, determining wave speed and mechanical loss can mean the difference between a sensor that works and one that does not. A team at Georgia Institute of Technology in Atlanta has designed a method for measuring these properties accurately and noninvasively, using a laser Doppler vibrometer to detect sound waves as they travel through a segment of fiber. Using a laser Doppler vibrometer,...
Adaptive Pulse Shaping Provides Photoselective Molecular Excitation
Jan 1, 2002 — Researchers from the Universität Würzburg in Germany have discovered that selective excitation of individual molecule types in a heterogeneous solution, while not attainable through manipulation of single parameters such as wavelength or linear...
Crystal Traps Light
Jan 1, 2002 — A year ago, two research teams made big news by slowing the propagation of light through a vapor trap to a virtual stop. Now a group led by Philip R. Hemmer of the Air Force Research Laboratory at Edwards Air Force Base, Calif., and M. Selim...
Direct Laser Interferometry Forms Magnetic Nanodots
Jan 1, 2002 — Laser-written compact disks have nibbled at market share for magnetic storage media. Could lasers be aimed next at enabling advanced magnetic media for computer hard drives? Russian and American scientists are collaborating on a way to pattern...
Exposing Photon-Photon Scattering
Jan 1, 2002 — It is intuitive to think of light as interacting with matter and not with itself, but this ignores the predictions of physics, which hold that photon-photon scattering is possible. Researchers at Umeå University in Umeå and at Chalmers University of...
Fast Ignition Boosts Neutron Counts
Jan 1, 2002 — In another step toward realizing the dream of fusion energy, researchers investigating fast-ignition inertial confinement fusion have produced 10 times the neutron count compared with that by inertial confinement alone. The work promises clean...
Interference Acts as Light 'Switch'
Jan 1, 2002 — A "switch" discovered by researchers at the University of Toronto in Canada could lead to the creation of an optical transistor. Aephraim Steinberg, Kevin Resch and Jeff Lundeen found that a BBO crystal lased with a 20-mW Ti:sapphire beam prohibits...
IR Blind-Spot Detection Testing Extended
Jan 1, 2002 — Autosense Ltd. of Denver and Ford Motor Co. of Dearborn, Mich., have agreed to expand testing of a low-cost blind-spot detection system that uses low-power IR lasers to locate vehicles in adjacent lanes. The Autosense-owned system, called...
Laser Beams Link Satellites
Jan 1, 2002 — The European Space Agency's Artemis satellite and the Centre National d'Etudes Spatiales' observation satellite, SPOT 4, established a satellite laser data link last November. The link used a 60-W, 850-nm laser diode from SDL Inc., which is now part...
Laser-Based Cooler Refrigerates by 13 K
Jan 1, 2002 — Most of us envision lasers cutting through plate steel or vaporizing tissue, but they also can cool molecules and atoms. A team at the University of Queensland in Brisbane, Australia, hopes to use this phenomenon to create a laser-based solid-state...
Microlenses Self-Align to Optical Fibers
Jan 1, 2002 — The size of microlenses enables them to guide laser beams to or from optical fibers that are hair thin. The difficulty of fabricating such small lenses pales in comparison with the challenge of aligning the lens to a fiber. The alignment task...
Near-Field Microscopy Probes Quantum Dots
Jan 1, 2002 — Near-field optical microscopy is enabling researchers at the University of Michigan in Ann Arbor and at the Naval Research Laboratory in Washington to investigate the fundamental physical characteristics of quantum dots. The work will lead to a...
Optical Sensor May Aid War on Bioterrorism
Jan 1, 2002 — Bioterrorism, once an abstract threat in the US, became reality in 2001. But even before the highly publicized outbreak of anthrax infections, scientists knew that they needed a sensitive, on-site technique for detecting trace amounts of deadly...
Optical Tomography Moves to Developmental Biology
Jan 1, 2002 — Faculty and students at Harvey Mudd College in Claremont, Calif., are using optical coherence tomography technology to capture three-dimensional movies of developing cell systems. Conventional methodologies typically employ a scanning electron...
Photon Sieve Focuses Soft X-Rays
Jan 1, 2002 — Researchers at Universität Kiel and Universität Hamburg, both in Germany, have achieved a sharper focus of soft x-rays from high-power, free-electron sources than from conventional zone-plate optics. The "photon sieve" method uses pinholes that vary...
Photonic Crystal Fiber Enables Optical Clock
Jan 1, 2002 — Atomic clocks are already the most accurate timepieces on the planet, but a new version promises accuracy 1000 times better than the current cesium-based ones. It employs a narrow optical transition in a single, laser-cooled, trapped 199Hg+ ion, and...
Photonic Crystal Lattice Controls Laser Polarization
Jan 1, 2002 — By applying a photonic crystal lattice and changing the shape of the unit cell structure, researchers in Japan have developed a surface-emitting laser that promises higher output powers and better control of the lasing modes than either...
Polarization Defines Nanowires
Jan 1, 2002 — Researchers at Martin Luther Universität Halle-Wittenberg and Fraunhofer Institute for Mechanics of Materials, both in Halle, Germany, have demonstrated a technique that may lead to novel photonic devices. Heinrich Graener, a professor of physics at...
Pulse Tracked Through Waveguide
Jan 1, 2002 — Conventionally, researchers study pulse propagation by coupling pulses into a medium and deducing what goes on inside from the radiation that is transmitted or reflected. Now a team from the University of Twente in Enchede, the Netherlands, has...
Setup Offers Entangled Pairs of 856-nm Photons
Jan 1, 2002 — As technological improvements enable the controlled manipulation of smaller elements, the prospects for quantum computing become more realistic. Now researchers have demonstrated a solid-state source of entangled photon pairs, a key component for...
Short Pulses Show Absolute Phase Results
Jan 1, 2002 — Absolute phase, the phase of a carrier with respect to the envelope of a pulse, theoretically has significant effects on intense, nonlinear laser-matter interactions, but proving that the effects actually occur has posed a problem because of...
Single Atom Probes Standing Wave
Jan 1, 2002 — A probe composed of a single calcium ion has produced one of the most precise measurements of the three-dimensional structure of a light-wave field. Researchers at Max Planck Institut in Garching, Germany, isolated the atom in a radio-frequency trap...
Violet LED Points the Way to VCSELs
Jan 1, 2002 — The III-nitrides have demonstrated their potential as solid-state sources of violet and near-UV light, but to fully realize their benefits for applications in printing, data storage and communications, it will be necessary to adapt them to...
'Guide Star' Enables Sodium Measurements
Dec 1, 2001 — Researchers at Imperial College in London are employing adaptive optics technology to measure sodium in the atmosphere with the 1-m Kapteyn Telescope at La Palma Observatory in the Canary Islands. The continuous-wave output of a 275-mW,...
AlGaN/GaN Deposited on Silicon
Dec 1, 2001 — Aixtron AG of Aachen, Germany, has announced that a research group has deposited III-V semiconductors on silicon wafers using the company's low-pressure metallorganic chemical vapor deposition system. The ability to deposit compound semiconductors...
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July 2024
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