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

Laser Sensors Measure Force
KASSEL, Germany -- KASSEL, Germany -- When it comes to measuring force, the more precise the measurement, the better. Just ask anyone who makes a living designing high-precision acceleration sensors for aircraft navigation or fast tactile sensing systems in robots. For years, however, researchers have been frustrated by the lack of progress in precisely measuring forces such as torque, pressure, mass and inertial acceleration. Now a research team from the University of Kassel has demonstrated how the photoelastic...
Lidar to Track Earth Atmosphere
BALTIMORE -- BALTIMORE -- Within the next five to seven years, NASA scientists and engineers from Johns Hopkins University plan to launch a next-generation fiber optic laser system to monitor the Earth’s atmosphere. Scientists rely predominantly on weather...
Lithographers Suggest Solutions to Smaller Features
Dec 1, 2000 — Semiconductor manufacturers should focus on the commercialization of extreme-ultraviolet and electron-projection lithographic techniques, recommended lithographers at the Next Generation Lithography Workshop, which was sponsored by International...
Measuring the Ultrasmall
HAMBURG, Germany -- HAMBURG, Germany -- Without measurement standards, our descriptions of the physical world would have no meaning. An essential standard defines atomic-scale dimensions, which are necessary to understand atomic and molecular structures. The distance...
MEMS-Based Gas Sensor Under Development
Dec 1, 2000 — Ion Optics Inc. of Waltham, Mass., has announced that it is developing a chip-based IR gas sensor that will be manufactured using microelectromechanical systems (MEMS) technology. The company expects that the device, known as SensorChip, will offer...
Microdisc LEDs Boast Higher Efficiencies
Dec 1, 2000 — Physicists at Kansas State University in Manhattan have developed LEDs with a novel architecture that display emission efficiencies greater than conventional devices. The interconnected microdisc LEDs, which the team describes in the Nov. 13 issue...
Microscopy Probes Ultrafast Dynamics
GÖTTINGEN, Germany -- GÖTTINGEN, Germany -- Researchers at the Max Planck Institute for Biophysical Chemistry have introduced a microscope that images molecular dynamics at a temporal resolution of 380 fs or faster. The all-optical, steady-state technique is...
Microstepping Improves Ronchigrams
Dec 1, 2000 — A team from the Universitat Politècnica de Catalunya in Terrassa, Spain, has developed a Ronchi test that increases the number of sampling points in a ronchigram and offers higher accuracy without increasing diffraction effects. In an...
Photonics Finds Solvents in Water
ATHENS, Ohio -- ATHENS, Ohio -- With the list of Superfund sites growing almost daily, the need for a reliable technique to test water samples on-site also increases. Researchers at Ohio University believe that near-IR spectrometers may have what it takes to be...
Researchers Grow Single-Crystal, 1.55µm VCSELs
Dec 1, 2000 — Researchers at the University of California in Santa Barbara have produced 1.55-µm vertical-cavity surface-emitting lasers (VCSELs) for telecommunications applications as a single crystal by molecular beam epitaxy. The process is more reliable...
Simple Sensor Detects Nerve Gas
SAN DIEGO -- SAN DIEGO -- A laser-based nerve gas sensor under development illustrates that we should not underestimate the power of the commonplace. First cobbled together for $24 from spare parts from CD players, the device outperforms nerve gas sensors that...
Spooky Photons May Beat Diffraction
PASADENA, Calif. -- PASADENA, Calif. -- Light is fundamentally a quantum mechanical entity, but most of today’s photonics technology does not depend upon this quantum nature and, in fact, ignores it altogether. Classical or semiclassical approaches to modeling...
UV VCSEL Produced
Dec 1, 2000 — Researchers at Sandia National Laboratories in Albuquerque, N.M., and Brown University in Providence, R.I., have developed a 383-nm vertical-cavity surface-emitting laser (VCSEL). The InGaN device, which may find applications in chemical sensing,...
Web-footed Grating Reduces Loss
IBARAKI, Japan -- IBARAKI, Japan -- A novel arrayed-waveguide grating developed at NTT Photonics Laboratories promises lower insertion losses and crosstalk for filters, multiplexers and demultiplexers in dense wavelength division multiplexing applications. The...
X-Ray Technique Probes Thin-Film Layers
Dec 1, 2000 — Surface charge on poorly conducting thin films, a result of the emission of photoelectrons, had been considered an obstacle to measuring such samples, but researchers at Weizmann Institute of Science in Rehovot, Israel, see it as a means of...
Bigger Isn’t Always Better for Molecular Light Funnels
ROCHESTER, N.Y. -- ROCHESTER, N.Y. -- Researchers at the University of Rochester have determined the ideal size for a light-harvesting molecule that one day may improve the light gathering of everything from photoelectric cells to genetically engineered plants. Led by...
Bow Tie Is Key to New Blue Laser
BOZEMAN, Mont. -- BOZEMAN, Mont. -- For years, researchers have sought to generate long-wavelength blue laser light inexpensively. Now a team from Montana State University has done just that by frequency doubling a Fabry-Perot diode laser in a bow-tie-shaped ring...
Coatings Control Aberration in Optical Pickups
Nov 1, 2000 — The demand for more-compact optical disk drives in laptops has created a problem: The shorter image-to-object distances result in astigmatism. The solution has been to introduce aberrations into the plastic lenses in the optical pickups, but this...
Color-Changing Array Identifies Odors
CHAMPAIGN, Ill. -- CHAMPAIGN, Ill. -- For years scientists have been attempting to emulate a pretty good chemical detector: the human nose. Now an array of chemical sensors may provide a straightforward process for identifying smells that is far more sensitive. The...
Crystal Yields Narrowband T-rays
Nov 1, 2000 — A team from the University of Michigan and IMRA America, both of Ann Arbor, has generated narrowband coherent terahertz radiation, or T-rays, with periodically poled LiNbO3 (PPLN). T-rays have potential applications in spectroscopy, imaging and...
Diamonds Produce Single Photons
Nov 1, 2000 — Two research teams from Germany and France have reported that nitrogen impurities in Ib synthetic diamonds can be used as room-temperature single-photon emitters. Such stable and robust sources of single photons could be a boon to the development of...
Inverted Structure Yields Solar-Blind UV Detector
GOLETA, Calif. -- GOLETA, Calif. -- A team from Cree Lighting Co. has devised an AlGaN photodiode that may find application as a solar-blind UV detector. Whether locating faults on power lines or tracking incoming missiles, numerous applications call for the...
Laser Altimetry Detects Thinning Ice
WALLOPS ISLAND, Va. -- WALLOPS ISLAND, Va. -- It’s probably a good idea to hold off buying that beachfront cottage, at least until the effects of global warming are better understood. Using an aircraftmounted laser altimeter and a global positioning system, a group...
Lasers Tweaked to Catch Gravity Waves
ADELAIDE, Australia -- ADELAIDE, Australia -- Researchers at Adelaide University had a bright idea: Develop a laser to boost the sensitivity of gravitational wave detectors. From Galileo’s homemade telescope in the 17th century to the great observatories of the 20th...
OPO Developed for Mid-IR Spectroscopy
Nov 1, 2000 — Physicists at the University of St. Andrews in St. Andrews, UK, have reported the development of an optical parametric oscillator (OPO) with mid-IR output. The device shows pulse repetition rates of up to 322 MHz and may lead to the development of a...

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