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

Quantum-Dot Photodetector Takes the Heat
Jun 1, 2003 — A quantum-dot IR photodetector with detection ability from 6.7 to 11.5 µm that can operate at temperatures of up to 260 K was demonstrated by researchers at the University of Florida in Gainesville and at National Central University in Chung-Li, Taiwan. The InGaAs/GaAs detector has peak detection wavelength shifts from 7.6 to 8.4 µm when the temperature rises from 40 to 260 K. The detector can handle such high temperatures because of its very low dark current and long carrier lifetime in the...
Silver Film Points to Superlenses
Jun 1, 2003 — A team of engineers at the University of California, Los Angeles, has demonstrated the regeneration of evanescent waves by the excitation of surface plasmons in a film with a negative dielectric constant. Reporting in the April 7 issue of Optics...
Single Atoms Trapped up to 3 s
Jun 1, 2003 — In the April 4 edition of Physical Review Letters, scientists at California Institute of Technology in Pasadena reported trapping times of up to 3 s for single cesium atoms in an intracavity far-off resonance trap. Beyond its importance for research...
Superradiance in Bose-Einstein Condensates Studied
Jun 1, 2003 — Investigating superradiance in Bose-Einstein condensates, a team at Massachusetts Institute of Technology in Cambridge has reported that short pulses of laser radiation produce patterns of recoiling atoms different from longer pulses. The work,...
Tunable Fiber Source Produces 30-nJ Pulses
Jun 1, 2003 — Researchers at Tampere University of Technology's Optoelectronics Research Centre in Tampere, Finland, have achieved 30-nJ pulse energies from an Yb-doped core-pumped fiber laser and a cladding-pumped double-clad fiber amplifier. The team noted that...
Yb-Doped Ceramic Laser Achieves 0.75 W
Jun 1, 2003 — A diode-pumped Yb:Y2O3 ceramic laser developed by scientists at the University of Electro-Communication in Tokyo, Nanyang Technological University in Singapore, Konoshima Chemical Co. Ltd. in Takuma, Japan, and the Russian Academy of Sciences in...
Capillary Force Fabricates Probes
May 1, 2003 — A team of researchers at Shizuoka University in Hamamatsu, Japan, reports in the March 10 issue of Applied Physics Letters a technique for the fabrication of probes for scattering-type near-field optical microscopes that employs capillary force in...
Castings Replicate Si-Template Optical Properties
May 1, 2003 — Sensing and drug-delivery applications may someday benefit from a technique that replicates the optical properties of a porous Si template in polymer castings. The fabrication process, devised at the University of California, San Diego, derives from...
External-Cavity Laser Diode Offers 300 mW
May 1, 2003 — Fedor N. Timofeev and Raman Kashyap of PhotoNova Inc. in Pointe Claire, Quebec, Canada, have reported 300-mW stable single-frequency operation near 976 nm from a laser diode with an external fiber cavity. They described the device, which displayed...
External-Resonator Raman Laser Emits 1.3 W
May 1, 2003 — In the last 20 years, a host of wavelengths have become available from conventional lasers, and manufacturers are offering systems that can be tuned to virtually any wavelength from the short ultraviolet to the long infrared. In general, these...
Lasers Play a Bigger Role in Biomedical Applications
May 1, 2003 — The laser is now well-established as a critically enabling tool in biomedical applications that range from research and clinical work at the molecular level to direct human applications for medical conditions such as strokes.These techniques employ...
Nd:YAG Produces 2.8 W of Blue Light
May 1, 2003 — Researchers at the Institut für Laser Physik at Universität Hamburg in Germany have set a record for blue CW power generated from a diode-pumped solid-state laser, using a new nonlinear crystal, BiB3O6 (BiBO), to frequency-double the 946-nm line of...
Optical Switch Designed for the Disabled
May 1, 2003 — Researchers at the National Electronics and Computer Technology Center in Pathumthani, Thailand, led by Sarun Sumriddetchkajorn, have developed an optical touch-activated switch to replace mechanical switches for use by disabled people. They...
Photobleaching Offers Coded Microspheres
May 1, 2003 — Using a technique they call spatial selective photobleaching, scientists at Ghent University and at Tibotec in Mechlin, both in Belgium, are producing optically encoded polymer microspheres that may find use in biomedicine, chemistry and...
Polymer Incorporates Alq3 for Organic LEDs
May 1, 2003 — As the market for alternative display technologies grows, aluminum tris(8-hydroxyquinoline), or Alq3, continues to enjoy the attention of researchers for its excellent optical properties. Unfortunately, this small-molecule organic LED material,...
See-Through Thin-Film Transistor Unveiled
May 1, 2003 — Transparent electronics may seem the stuff of science fiction, but engineers from Oregon State University and Hewlett-Packard Co. in Corvallis, Ore., have developed zinc-oxide-based thin-film transistors that they hope will find applications in...
Setup Combines Ytterbium Fiber Lasers
May 1, 2003 — A group at Massachusetts Institute of Technology in Cambridge is combining the output of ytterbium fiber lasers using a master-oscillator power-amplifier configuration to produce a single beam for materials processing and other high-power...
Soft Lithography Reproduces Microlenses
May 1, 2003 — As we move from the electronics to the photonics age, micro-optics are finding a place in more and more applications. Now researchers have introduced a soft lithography process that they hope will enable the low-cost, mass production of microlenses...
Stoichiometric Crystal Promises Laser Uses
May 1, 2003 — A team of researchers from Germany and Spain is investigating the properties of a stoichiometric crystal for use in face-cooled lasers, such as thin-disc and microchip designs. The crystal, KYb(WO4)2 -- or KYbW -- has demonstrated 20 mW of 1068-nm...
3-D Crystals Produced by Microassembly
Apr 1, 2003 — Employing techniques that were developed for manufacturing integrated circuits, researchers in Japan have constructed three-dimensional photonic crystals from layers of patterned semiconductor plates. The method points to the development of more...
All-Optical Frequency Shifter Demonstrated
Apr 1, 2003 — As the demand for speed and bandwidth in communications networks increases, new approaches to switching and routing are under study. Now researchers at the University of Illinois at Urbana-Champaign have developed an all-optical device that rapidly...
Dielectrophoresis Builds Photonic Crystals
Apr 1, 2003 — Scientists at the University of Delaware in Newark, Carnegie Mellon University in Pittsburgh and North Carolina State University in Raleigh have assembled one- and two-dimensional photonic crystals by exposing microspheres to an alternating electric...
Er:Fiber Laser Suitable for Optical Clocks
Apr 1, 2003 — Scientists at Technische Universität München in Garching and at Ludwig Maximilians Universität München in Munich, both in Germany, have presented an erbium-doped fiber laser system that offers 110 mW of linearly polarized output power in 65-fs...
Femtosecond Laser Probes Plasma Formation
Apr 1, 2003 — Pump-probe experiments employing femtosecond lasers have exposed the dynamics of numerous ultrafast phenomena. Researchers at Univer-sité Claude Bernard Lyon 1 in Villeurbanne, France, and the US Army Research Laboratory in Adelphi, Md., have...
Femtosecond Techniques Herald Attophysics
Apr 1, 2003 — In pursuit of shorter and shorter sources of illumination to probe dynamic physical phenomena, researchers at Technische Universität Wien in Austria and at Max Planck Institut für Quantenoptik in Garching, Germany, have used femtosecond techniques...

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