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(9,094 items)
Research & Technology News
Micromachining Yields Compact FT Spectrometers
Aug 1, 2004 — Fourier transform spectroscopy is poised to take the next step forward. Thanks to silicon micromachining techniques, high-resolution spectrometers will soon move out of the lab and into commercial applications. Instruments based on microelectromechanical systems (MEMS) technology, as illustrated by a lamellar grating interferometer developed at the University of Neuchâtel's Institute of Microtechnology in Switzerland, will be produced in large quantities and at low cost. Among the...
Microscale Actuators Drive Macroscale Optical Element
Aug 1, 2004 — A team of engineers has reported the development of a rigid-body motion generator based on a two-dimensional array of deformable micromembrane actuators. The generator has a variety of potential optical applications, including use with tunable...
Nonlinear Behavior in Quantum-Well IR Photodetector Is Studied
Aug 1, 2004 — Although the potential of quantum-well infrared photodetectors for thermal imaging has been known for some time, significantly less research has been focused on the nonlinear behavior of these devices and on the potential applications of that...
Tapered Fabry-Perot Filter Measures Wavelength
Aug 1, 2004 — There are many applications of a simple, elegant technique to separate and measure the wavelengths present in an optical signal. Indeed, an important component of the history of spectroscopy has been the ongoing search for improved approaches to...
Two Wells Are Better than One for IR Detectors
Aug 1, 2004 — Researchers at Princeton University in New Jersey have demonstrated that two wells are better than one as far as quantum-well infrared photodetectors are concerned. The key, as demonstrated in prototype devices, lies in making dual wells that are...
Up-Conversion Fiber Laser Produces Visible Output
Aug 1, 2004 — Lumics GmbH of Berlin has developed a visible-wavelength source based on an up-conversion fluorozirconate (ZBLAN) fiber laser that has emission lines comparable to those from an argon-ion laser. It works by exploiting the absorption of rare-earth...
Yb:Y2O3 Ceramic Laser Generates 4.2 W
Aug 1, 2004 — Ceramic lasers may have a dramatic effect on the solid-state laser marketplace because, among other advantages, they promise inexpensive mass production. Several ceramic ion-host combinations have been investigated, including Nd:YAG, Yb:YAG,...
Broadband Mirrors Built of Porous Silicon
Jul 1, 2004 — A research group at the University of New South Wales in Sydney, Australia, has reported the fabrication of broadband mirrors made from porous silicon for CW and mode-locked Ti:sapphire lasers and for a tunable dye laser. The performance of the high...
Electrically Driven Nanocrystal Emitters Proposed
Jul 1, 2004 — Scientists at Los Alamos National Laboratory in Los Alamos, N.M., and at Sandia National Laboratories in Albuquerque, N.M., have reported a scheme that may be suitable for the electrical pumping of displays, light sources, optical amplifiers and...
Entanglement Studies Suggest Interferometry Application
Jul 1, 2004 — Two groups of scientists have independently demonstrated means of entangling photons that may enable applications in gravity-wave detection and optical interferometry. Using different approaches to entanglement, the groups have proved that the...
Frequency-Doubled Nd:YAG Generates 200 W
Jul 1, 2004 — A high-power green Nd:YAG laser has been developed at Mitsubishi Electric Corp.'s Advanced Technology R&D Center in Amagasaki, Japan, and is being studied for the crystallization of amorphous silicon films into polycrystalline silicon films...
Quantum Dots Form Heart of IR Detector
Jul 1, 2004 — A collaboration of the University of Southern California in Los Angeles and the University of Texas at Austin has produced a quantum-dot photodetector for use in the 8- to 12-µm atmospheric window. The performance of the cooled device is competitive...
Quantum Grid IR Spectrometer Enables Multicolor Detection
Jul 1, 2004 — Two- and four-color infrared imaging employing multiple detectors is used for applications such as target discrimination, land mine detection and geological surveying. Now scientists from the US Army Research Laboratory in Adelphi, Md., and from...
Schott Researchers Develop New Phase-Shift Material
Jul 1, 2004 — A research and development team in Meiningen, Germany, has developed an advanced phase-shift material for Schott Lithotec AG of Jena, Germany. The material is suitable for 157-, 193- and 248-nm lithography, such as for use in DRAM memory and logic...
Silver Slab Promises Subwavelength Imaging
Jul 1, 2004 — A team of scientists at the University of Canterbury in Christchurch, New Zealand, has demonstrated that a planar slab of silver can be used as a lens in a near-field lithography setup at 365 nm. If the approach can be refined to enable the l/9...
Superconducting Single-Photon Detectors Characterized
Jul 1, 2004 — A team from Moscow State Pedagogical University in Moscow, Naval Research Laboratory in Washington, NPTest Inc. in San Jose, Calif., and the University of Rochester in Rochester, N.Y., has reported results of a series of tests on nanostructured NbN...
Terahertz Laser Diodes Display Single-Mode Operation
Jul 1, 2004 — Researchers at the National Enterprise for nanoScience and nanoTechnology and Scuola Normale Superiore, both in Pisa, Italy; and at Cambridge University and at the University of Leeds, both in the UK, have fabricated distributed feedback quantum...
Tungsten Inverse Opal Investigated
Jul 1, 2004 — University of Toronto researchers have reported the fabrication of an inverse opal film from tungsten. At the Conference on Lasers and Electro-Optics (CLEO) in San Francisco in May, Georg von Freymann described the work, which included the...
Waveguide Length Affects High-Harmonic Quality
Jul 1, 2004 — A study of the relationship between high-harmonic generation and the length of the gas-filled waveguides in which it occurs promises researchers the tools to develop better sources of coherent extreme-UV and x-ray radiation. The collaboration behind...
Fiber Laser Offers New Approach to 488-nm Emission
Jun 1, 2004 — Solid-state laser sources at the argon-ion wavelength of 488 nm find many applications in medicine, graphics, semiconductor inspection and elsewhere. Several commercial models are already available, and others are expected to be introduced to the...
Left-Handed Materials Research Advances
Jun 1, 2004 — The ability of left-handed materials to focus electromagnetic waves in unusual ways promises unique applications in subwavelength optical imaging and in radar. Now, as these materials make the transition from nearly 40 years of theory to reality,...
Nd-Doped Fiber Laser Generates 360-fs Pulses at 900 nm
Jun 1, 2004 — Femtosecond lasers are useful in machining applications as well as in medicine, precise rangefinding and fluorescence studies. Fiber lasers offer an attractive alternative to conventional femtosecond sources because of their high efficiency and...
New Resin Suitable for Multiphoton Polymerization
Jun 1, 2004 — Scientists at Boston College in Chestnut Hill, Mass., and at Boston University have developed an acrylate resin for multiphoton absorption polymerization. To demonstrate the mechanical and optical properties of the material, they have used it to...
Nonlinear Lidar Detects, Identifies Bio-Aerosols
Jun 1, 2004 — As world governments have grown more attentive to the potential threat of biological weapons, a premium has been placed on developing technologies that can detect and identify airborne pathogens. Such technologies also would be useful for public...
Optical Metrology Reconstructs Audio Recordings
Jun 1, 2004 — Under an interagency agreement, the Library of Congress in Washington and Lawrence Berkeley National Laboratory in Berkeley, Calif., will investigate the application of optical metrology to the preservation of audio recordings. The researchers on...
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July 2024
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