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(9,094 items)
Research & Technology News
Silicon-Based Laser Emits in Visible
Dec 1, 2005 — Although much of the excitement about silicon lasers in this year has centered on silicon Raman lasers investigated at Intel Corp. and at the University of California, Los Angeles, other re- searchers have pursued other promising approaches to silicon-based lasers. Recently, scientists at the University of Cincinnati, working with a group at Nitronex Corp. in Raleigh, N.C., obtained visible lasing from a layer of Eu-doped GaN deposited on a silicon substrate. Europium ions in a 0.5-µm-thick...
Single-Mode Fiber Laser Generates 125 W Tunable over 20 nm
Dec 1, 2005 — Powerful single-frequency lasers are required for many scientific and engineering undertakings, such as gravity-wave detection and coherent combination of multiple beams. Such sources also have potential as very high power transmitters in...
Technique Auto-Aligns Fiber to a Waveguide
Dec 1, 2005 — The high cost of actively aligning components in photonic devices is one of the major barriers to a generation of inexpensive, mass-produced photonic equipment. Indeed, Intel Corp.’s Photonics Technology Lab of Santa Clara, Calif., has identified...
Tiny Ring Resonator in Silicon Is a Wavelength Converter
Dec 1, 2005 — Wavelength converters perform the important function of changing an optical signal from one wavelength to another. Such a capability is vital, for example, when a channel to be added to a wavelength-multiplexed fiber has the same wavelength as an...
Erbium Fiber Laser Generate Supercontinuum
Nov 1, 2005 — Researchers at the University of Tokyo have demonstrated a compact, self-contained supercontinuum laser based on the addition of a length of highly nonlinear dispersion-shifted fiber inside the resonator of an erbium-doped fiber ring laser. The...
External Resonator Sharpens Diode Array Bandwidth
Nov 1, 2005 — Monolithic arrays of laser diodes find wide application as pumps for solid-state lasers, but their natural bandwidth of several nanometers usually is wider than the absorption of the active ion in the solid-state laser. This mismatch often leads to...
Gratings Couple Optical Fibers to Silicon Photonic Devices
Nov 1, 2005 — Advances in silicon photonics have ignited an intense interest in optical devices based on silicon (see pages 53, 62 and 68). An inherent problem with the application of this technology, however, is the low efficiency with which light can be coupled...
Intracavity Raman Laser Is Continuous-Wave
Nov 1, 2005 — Although pulsed Raman lasers have been thoroughly investigated during the past two decades, only a few continuous-wave devices have been built. While such non-pulsed lasers would be useful in many applications, the drawback has been that the high...
Low-Temp Fabrication of Piezoelectric Microactuators Demonstrated
Nov 1, 2005 — Scientists at Pennsylvania State University in University Park have produced flextensional microactuators the width of a human hair using a low-temperature bonding process. The devices feature a precision micromachined silicon beam coupled to lead...
New Nonlinear Crystal for Infrared OPOs
Nov 1, 2005 — A collaboration of scientists in France, Russia and Germany has demonstrated an optical parametric oscillator (OPO) based on a new nonlinear crystal, lithium selenoindate (LiInSe2, abbreviated LISe). The investigators believe that their results are...
Parametric Amplifier Shows Potential for Telecom
Nov 1, 2005 — The erbium-doped fiber amplifier (EDFA) was one of the most important enabling technologies behind the fiber optic telecommunications boom of the 1990s. Because optical signals are attenuated as they travel through fiber, they must be periodically...
Probe Array Patterns and Images Nanoscale Features
Nov 1, 2005 — As reported in the October issue of Nano Letters, researchers at the cat Urbana-Champaign have designed and fabricated a multifunctional probe array for direct chemical pattern generation and imaging. The individually addressable, thermoelectrically...
Superlensing Demonstrated in the Mid-IR
Nov 1, 2005 — Researchers at the University of Texas at Austin and at Case Western Reserve University in Cleveland have created a functional superlens in the mid-infrared, achieving a resolution of better than λ/10 using an 11-µm source. Using optical...
Tungstate Laser Generates Raman Output
Nov 1, 2005 — The family of ytterbium-doped potassium tungstate lasers has been frequently investigated in recent years and has spawned at least four entries in the commercial market -- the Spectra-Physics Eclipse, the Amplitude Systemes t-pulse and s-pulse, and...
UCSD Dedicates Research Facility Friday
Oct 27, 2005 — SAN DIEGO, Oct. 27 -- The California Institute for Telecommunications and Information Technology's (Calit2) new research facility at the University of California, San Diego (UCSD) will be officially dedicated in a ceremony on Friday, Oct. 28. From...
UCSD to Dedicate Research Facility
Oct 27, 2005 — SAN DIEGO, Oct. 27 -- The California Institute for Telecommunications and Information Technology's (Calit2) new research facility at the University of California, San Diego (UCSD) will be officially dedicated in a ceremony on Friday, Oct. 28. From...
Bad Tunnel Diode Enables Good Millimeter-Wave Sensor
Oct 1, 2005 — By realizing that a bad tunnel diode could form the basis for a good sensor, researchers at Ohio State University in Columbus, the US Naval Research Laboratory in Washington and the University of Notre Dame in Indiana may have found a new technology...
Bragg Grating Reduces OPO Bandwidth by Factor of 20
Oct 1, 2005 — Because the wavelengths required for most spectroscopic, remote sensing and biophotonics measurements are rarely emitted by conventional lasers, nonlinear wavelength conversion is frequently employed in these applications. Stimulated Raman...
Brillouin Imaging Demonstrated
Oct 1, 2005 — Scientists at Arizona State University in Tempe have developed a confocal Brillouin imaging microscope that enables the rapid collection of information about the elastic properties of condensed matter systems. The system has potential applications...
Carbon Nanotubes Mode-Lock Fiber Laser
Oct 1, 2005 — Researchers at the University of Tokyo and at Alnair Laboratories Corp. of Kawaguchi, Japan, have demonstrated what they believe is the first 1300-nm laser mode-locked with carbon nanotubes. The accomplishment is an extension of their earlier work...
Double Duty for MEMS-Based Optical Switch
Oct 1, 2005 — Optical switches based on microelectromechanical systems (MEMS) are at the heart of next-generation “transparent” optical telecommunications networks. Nearly all of today’s networks are “opaque” in the sense that the optical signal is periodically...
Four-Wave Mixing Trumps Homogeneous Gain in Erbium Laser
Oct 1, 2005 — Although current wavelength-division multiplexing (WDM) systems require a different laser for each wavelength transmitted over an optical fiber, engineers envision more-efficient systems in which a single laser will emit all of the necessary...
Linear Optical Amplifier Generates Multiple Wavelengths Simultaneously
Oct 1, 2005 — The previous report describes a technique to finesse mode competition in a homogeneously broadened erbium-fiber laser. Researchers at Hong Kong Polytechnic University in Kowloon, China, have taken the opposite approach to obtaining multiple...
Novel Technique Monitors Carbonyl Sulfide
Oct 1, 2005 — Researchers at Universität Düsseldorf in Germany have developed a technique that they call cavity leak-out spectroscopy, a variation of cavity ringdown spectroscopy (see “Through the Looking Glass and What Cavity Ringdown Found There,” Photonics...
Photonics Goes Underground in Silicon
Oct 1, 2005 — A research group at the University of California, Los Angeles, has demonstrated the fabrication of optical devices — specifically, a microdisk resonator and coupling waveguides — beneath the surface of a silicon substrate, leaving the surface clear...
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