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Lambda Research Optics, Inc. - DFO
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Research & Technology News

Laser Enables Robust Quantum Communication
Apr 1, 2002 — Quantum communication is the key to such advances as quantum computing and encryption. In a nutshell, quantum communication means transferring entanglement -- identical quantum states -- over long distances. Unfortunately, the fidelity of those states will decrease exponentially with distance. A new proposal for entanglement transfer promises to improve fidelity. At the heart of the system are pairs of atomic ensembles entangled by laser irradiation. An ensemble consists of a large number of...
Laser System Detects Explosives Remotely
Apr 1, 2002 — Traditionally, the most sensitive techniques for detecting explosives have involved sampling and analyzing the air near a suspected bomb. This is time-consuming and potentially dangerous. Now a team at Soreq Nuclear Research Center in Yavne, Israel,...
Laser Tweezers Transport Cell-Size Liposomes
Apr 1, 2002 — Researchers at Kyoto University in Japan have demonstrated a method to trap and transport cell-size liposomes with laser tweezers. Liposomes can carry chemicals such as enzymes, DNA or RNA and remain stable for weeks. The work may pave the way for...
Measurement Offers Insight into Diodes
Apr 1, 2002 — Unamplified spontaneous emission and gain spectra offer insight into the behavior of semiconductor laser materials and structures. But the analytical methods that use them require complex materials processing to enable the measurements in different...
Method Proposed for Single-Cycle Pulses
Apr 1, 2002 — Using computer simulations, researchers from the University of California and the University of Southern California, both in Los Angeles, have proposed a method to use the phenomenon of particle deceleration in underdense plasmas to generate nearly...
Near-Field Microscopy Maps Nanoscale Material Compositions
Apr 1, 2002 — Far-field microscopy techniques typically cannot map different types of materials on multicomponent nanostructures because the associated wavelength limit causes blurring of the image. Researchers at the Max Planck Institut für Biochemie in...
Near-Field Optics Pattern Photosensitive Sol Gel Films
Apr 1, 2002 — Scientists from École Polytechnique in Palaiseau, France, have created nanometer-scale patterns in thin sol-gel films containing azobenzene moieties by using the light from a near-field optical probe to induce migration of the photosensitive...
Quantum Dots Offer Single Photons
Apr 1, 2002 — Quantum key distribution systems promise to enable unbreakable codes for the transmission of sensitive data. A group at Toshiba Research Europe Ltd. and Cambridge University, both in Cambridge, UK, has reported the development of a crucial element...
Quantum Hall Far-IR Photodetector Evaluated
Apr 1, 2002 — The ability of modulation-doped AlGaAs/GaAs heterojunctions to detect far-IR radiation has been known for almost two decades, but only recently has the technology evolved into a high-sensitivity, narrowband tunable photodetector. Researchers at the...
Raman Laser Displays 62-µW Threshold
Apr 1, 2002 — Raman lasers promise applications in telecommunications as sources for component testing and as pumps for erbium-doped fiber amplifiers, but they have tended to require significant input powers. Researchers at California Institute of Technology in...
Ringdown Caught with Single Shot
Apr 1, 2002 — A team from Los Gatos Research in Mountain View, Calif., has developed a modified version of ringdown spectroscopy that obtains information about a trace molecule's absorption spectrum over a large optical bandwidth with a single laser...
Ruthenium-Doped Nanotubes Fluoresce
Apr 1, 2002 — Using a chemical vapor-deposition technique, a research team from Pennsylvania State University in University Park and the Center for Applied Energy Research in Lexington, Ky., has fabricated ruthenium-doped multiwall carbon nanotubes that...
Unmanned-Aircraft Sensor Could Detect Cave Dwellers
Apr 1, 2002 — A sensor suite designed for unmanned aircraft promises sensitivity and resolution high enough to detect human activity in caves. The proposed Airborne Infrared Surveillance sensor would consist of three acquisition and three tracking cameras, along...
Welding System Monitors Gas Shield
Apr 1, 2002 — Although laser welding is widely used in manufacturing, it has not yet found a home in the aerospace industry. The technique would be an attractive tool in this sector if its reliability could be improved, but aerospace alloys present problems that...
'Slow Light' May Enable Benchtop Black Holes
Mar 1, 2002 — Ulf Leonhardt of St. Andrews University in St. Andrews, UK, hopes to bring black holes -- or, at least, an optical analog of their event horizons -- to the lab. In the Jan. 24 issue of Nature, he describes how the manipulation of an...
0.1-Hz Detector Could Measure Cosmic Acceleration
Mar 1, 2002 — We are on the cusp of the gravity-wave revolution in astronomy. Numerous detectors -- powered by bars of metal or by beams of light, on the ground or in orbit -- are scheduled to come online over the next 10 years or are awaiting approval to do so,...
Bright White Organic LED Developed
Mar 1, 2002 — Using precisely calibrated thicknesses of bright blue, red and green light-emit-ting layers, researchers at Academia Sinica's Institute of Chemistry in Taipei, Taiwan, have developed a bright white organic LED that produces an intensity of 24,700...
Coupled-Resonator VCSEL Produces High Output
Mar 1, 2002 — Researchers from the Sandia National Laboratories' Center for Compound Semiconductor Science and Technology in Albuquerque, N.M., have constructed a monolithic coupled-resonator vertical-cavity laser that produces up to 6.1 mW of output in...
Digital Camera Tracks Eye Location
Mar 1, 2002 — Researchers at the Institute of Information Science of Academia Sinica and National Taiwan University, both in Taipei, have developed a system that adjusts stereoscopic images on a monitor to the position of the viewer's eyes, thus eliminating the...
Dressing Particles Takes Time
Mar 1, 2002 — Physicists have typically assumed that a free charged particle introduced into a nonequilibrium Coulomb system instantaneously becomes a "dressed" particle, completely integrated into the system. However, researchers from Technische Universität...
Electrostatic Monolayering Produces Controlled Refractive Indices
Mar 1, 2002 — Researchers from the Universidad Publica de Navarra in Spain and from Virginia Polytechnic Institute and NanoSonic Inc., both in Blacksburg, have shown that an electrostatic self-assembled monolayer process can create multilayered thin-film...
Holographic Optical Memory Estimate Lower Than Predicted
Mar 1, 2002 — A new mathematical method of determining the theoretical storage capacity of volume holographic memory systems has revealed an estimation two orders of magnitude lower than the previously predicted terabit-per-centimeter cube. Designed by Adil...
Hybrid Microscopy Images Calcium
Mar 1, 2002 — By combining two-photon-excitation and third-harmonic-generation microscopy, researchers at Centre National de la Recherche Scientifique in Talence and Bordeaux, France, have produced images that correlate cell processes with cell...
Infrared Spectrometer Filter Is Electrically Tunable
Mar 1, 2002 — Portable infrared spectrometers enable in situ analysis of compounds in a variety of hazardous environments on Earth and in space. Such possibilities have led researchers at Ryukoku University in Otsu, Japan, to develop a small, robust infrared...
Interferometer Yields Large Gratings
Mar 1, 2002 — A European research team has demonstrated a low-cost solution to the manufacture of large diffraction gratings using a variant of an interferometer developed more than a decade ago. The work promises to yield better gratings for chirped pulse...

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