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Hamamatsu Corp. - Creating a Better Future LB 1-25
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Research & Technology News

Opaque Layer Improves Light Output
Sep 1, 2002 — Attempting to improve an organic LED's light output by covering its top with an opaque, 50-nm-thick layer of silver may seem a little nonsensical, but the technique has allowed researchers at the University of Rochester in New York to increase the observed photoluminescence intensity tenfold. The silver transfers molecular fluorescence from the LED's inner layers by coupling radiation from the metal's interior surface plasmon mode to its exterior surface plasmon mode. As reported in the May 20...
Optical Trapping Tests Particles at Oil-Water Barrier
Sep 1, 2002 — Scientists at Hull University, the CLRC in Didcot and Imperial Chemical Industries in Middlesborough, all in the UK, have measured the repulsive force between two charged polystyrene particles in an oil-water interface as it relates to their...
Photons Spin More Data
Sep 1, 2002 — For years, physicists have known that photons can exhibit orbital angular momentum. Spin manifests when a photon's transverse components are out of phase, whereas orbital angular momentum affects the entire phase front of the beam. The mechanical...
Quantum Cascade Laser Amplifier Developed
Sep 1, 2002 — Scientists from Bell Labs in Murray Hill, N.J., have developed an amplifier for quantum cascade lasers that can achieve high-power single-mode emission at a wavelength of 7.4 µm. They used an InGaAs/InAlAs/InP semiconductor amplifier, also based...
Researchers Form Liquid-Light Theory
Sep 1, 2002 — Beams of light can be collimated, split or chirped -- and now, some researchers say they can even be liquefied. Based on the assumption that a laser beam can be thought of as a gaseous stream of photons, the researchers, from the Universidade de...
Researchers Probe Chemistry of Bubbles
Sep 1, 2002 — Since luminescence in single cavitating bubbles was described more than a decade ago, the phenomenon has attracted much attention from scientists. Earlier this year, interest was piqued all the more, when a team at Oak Ridge National Laboratory in...
Self-Assembly Eases Fabrication of Photonic Crystals
Sep 1, 2002 — Devices constructed of photonic crystals promise to enable the precise, localized control of optical propagation. The fabrication of such crystals usually involves a complex and expensive multistep process. However, researchers at the University of...
Spectroscopy Bares Nanoparticle Structure
Sep 1, 2002 — Sometimes you need a bigger laser to study smaller particles. Specifically, a group of Dutch researchers applied a free-electron laser to study nanoparticles representing matter between the atomic and bulk states. Infrared spectroscopy...
Spectroscopy Tracks Vibrational Energy in Liquids
Sep 1, 2002 — Using ultrafast anti-Stokes Raman spectroscopy, chemists at the University of Illinois in Urbana-Champaign have developed a spectroscopic method for tracking the flow of vibrational energy through the chemical bonds of molecules in the liquid state....
Tabletop Source Offers Extreme Ultraviolet
Sep 1, 2002 — Generating laserlike beams of x-rays from a simple tabletop setup, a team based at the University of Colorado's JILA in Boulder has demonstrated the ability to perform extreme-ultraviolet holography. "Lasers in the visible region of the spectrum...
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...
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...

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