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(38,327 articles)
Popular News
Calibration and Traceability Ensure Measurement Accuracy
May 1, 2004 — Researchers, scientists, test engineers and technicians who perform absolute power measurements expect them to be accurate and consistent. As lasers become more powerful, there is increasing concern with measurement consistency and, consequently, the instruments’ accuracy and traceability to a national standard. High-quality power meters provide measurement assurance through a two-step system: calibration of the photodetector and the electronic gain stages. These steps are accomplished by...
The US Photonics Job Market: Is It Getting Better?
May 1, 2004 — As you talk with people in the photonics industry, you detect a hint of optimism regarding business for the rest of 2004. Some companies have started to see an upswing, which is beginning to be reflected in the want ads. Because many companies...
In Automated Proofreading, One Equals Four
May 1, 2004 — One machine eye equals four human ones. That's the formula used by manufacturers when following US Food and Drug Administration (FDA) guidelines for proofreading the inserts, labels, regulatory directives or other materials that accompany...
Fourier Transform Spectrometer Measures 193-nm Wavelength Standards
May 1, 2004 — Using a novel Fourier transform spectrometer optimized for ultraviolet wavelengths, Gillian Nave and Craig J. Sansonetti of the National Institute of Standards and Technology (NIST) in Gaithersburg, Md., have measured the spectra of 193-nm reference...
Excimer Laser Powers Phase-Shifting Interferometer
May 1, 2004 — An interferometer that promises to improve the characterization of phase-shift masks for use in semiconductor lithography has been developed by researchers in Germany. The instrument, which uses an ArF laser as an illumination source, takes several...
Amplifier Enhances Ringdown Spectroscopy
May 1, 2004 — In recent years, investigators have adapted the principles of ringdown spectroscopy (see sidebar, facing page) to fiber optic configurations by placing high reflectors on each end of a fiber and observing the ringdown time of an injected pulse. But...
Teams Try New Approaches to Fiber Sensors
May 1, 2004 — A pair of unrelated papers published recently in Optics Letters illustrates the diversity of interesting and promising new approaches to fiber optic sensors that scientists currently are investigating. In one, the principle of cavity ringdown...
Lasers Date Ancient Groundwater
May 1, 2004 — Using a laser-based isotopic analysis technique, geologists and physicists in the US, Switzerland and Egypt have determined that the water in Egypt's Nubian Aquifer is up to 1 million years old. The results reveal changes in the local climate over...
Photonic Crystal Exhibits Enhanced Faraday Rotation
May 1, 2004 — Researchers at Royal Institute of Technology in Stockholm, Sweden, have reported a multilayer structure they call a magneto-optical photonic crystal that displays 140 percent greater Faraday rotation at 748 nm than a single-layer bismuth iron garnet...
'Optical Clockworks' Display Precision for Fundamental Physics Experiments
May 1, 2004 — An international team of scientists has demonstrated that femtosecond-laser-based frequency synthesizers, which are key components of next-generation optical atomic clocks, offer fractional uncertainties approaching one part in 1019. The work...
No-Moving-Parts Optical Setups Scan Bar Codes
May 1, 2004 — Scientists at the University of Central Florida in Orlando have demonstrated a passive-optics no-moving-parts 1-D bar-code scanner. One of several designs for such systems offered by the team, it promises to enable the development of simple,...
Trapped Atom Generates Single Photons
May 1, 2004 — A research team at California Institute of Technology in Pasadena has demonstrated that an optically trapped cesium atom can be induced to emit single photons. The work may have applications in quantum cryptography, in distributed quantum networking...
Lithography Yields Micro-Optics Imaging System
May 1, 2004 — Researchers at the University of Arizona in Tucson and at the University of Oulu in Finland have fabricated a micro-optics imaging system for a miniature microscope using a gray-scale lithographic printing technique with sol-gel glass. They reported...
Molecules Display Optical Switching
May 1, 2004 — In the April 9 issue of Science, a team from the University of Groningen and from Syncom, both in Groningen, the Netherlands, has described a self-assembling molecular system that exhibits novel optically switchable behavior. The group suggests that...
Laser Technique Generates 1.77-nm X-rays
May 1, 2004 — A team of scientists at Technische Universität Wien in Austria, Max Planck Institut für Quantenoptik in Garching, Germany, and Universität Würzburg in Germany has reported the generation of coherent 1.77-nm x-rays. Reported in the April 23 issue of...
Femtosecond Laser Facility Planned for Canada
May 1, 2004 — The Canada Foundation for Innovation in Ottawa has announced the allocation of almost C$21 million for construction of the Advanced Laser Light Source. The facility, which will be located in Varennes and administered by the Université du...
High-NA Fibers Enable High-Power Lasers
May 1, 2004 — A research group at the University of Bath in the UK has analyzed and demonstrated techniques to fabricate photonic crystal fibers (PCFs) with a numerical aperture as high as 0.9. The techniques may dramatically affect the efficiency and power of...
New Structure Improves Telecom Lasers
May 1, 2004 — Many researchers are aggressively developing wavelength-tunable vertical-cavity surface-emitting lasers (VCSELs) based on microelectromechanical systems (MEMS) as optical sources for fiber optic telecommunications systems. Although most work until...
C-Band Er/Yb Fiber Laser Generates 43 W
May 1, 2004 — Tunable lasers in the eye-safe, 1.5- to 2.0-µm region are useful for remote optical sensing, range-finding and free-space communication. Erbium-doped fiber lasers have the necessary gain bandwidth to cover shorter wavelengths of this spectral...
Hollow Glass Waveguides Maintain Polarization of CO2 Laser Beam
May 1, 2004 — Hollow glass waveguides, whose inside surfaces are coated to reflect 10.6-µm radiation, often are employed to deliver the beam from an industrial CO2 laser to the workpiece. In many cases, such as for metal welding and cutting, a polarized beam is...
Double-Clad Photonic Crystal Fiber Laser Is Side-Pumped
May 1, 2004 — Probably the most common technique for pumping fiber lasers is to pump them through the ends of the fiber, focusing the light into the inner cladding. A drawback of this is that it does not tolerate high-power pumping with multiple sources. To...
Advanced Instrumentation Benefits Microelectronics Manufacturing
May 1, 2004 — Laser-based processing has been a key enabling technology in improving the quality and reducing the size of devices such as cell phones, laptop computers, digital cameras and MP3 players. As manufacturers continue to press for even greater device...
AFS to Buy Marietta Fibernet
Apr 30, 2004 — ROCHESTER, N.Y., April 30 -- Privately held American Fiber Systems Inc. (AFS) announced it will purchase the operating assets of Marietta FiberNet (MFN), a fiber optic transport business based in Marietta, Ga. MFN is a wholly owned subsidiary of the...
Daily News Briefs
Apr 30, 2004 — Coreco Imaging Inc., a Montreal-based developer of high-performance machine vision components and services, announced it has opened it first office outside of North America, in Tokyo's Shinagawa District. . . . Texas Instruments Inc. (TI) Senior...
Finisar to Buy Infineon Fiber Unit
Apr 30, 2004 — SUNNYVALE, Calif., April 30 -- Finisar Corp. announced yesterday it will acquire the fiber optics business unit of Infineon Technologies AG, of Munich, for 135 million shares of stock, valued at $263 million. Following the transaction, Infineon will...
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