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Research & Technology News

Eliminating Beat Noise in Ring Lasers
Jul 1, 2003 — Single-frequency ring lasers utilizing erbium-doped fiber amplifiers as the gain medium are attractive in a number of applications, from optical sensors to telecommunications. A serious barrier to their adoption into these technologies, however, is the intensity noise that is generated when the lasing longitudinal mode beats against amplified spontaneous emission in suppressed longitudinal modes. Researchers at Princeton University in New Jersey have suppressed this noise by inserting a...
Fiber Laser Pumps Fiber Lasers for Telecommunications Applications
Jul 1, 2003 — A coalition of British and Russian telecom engineers has developed a fiber laser system that may boost performance and cut costs when substituted for the traditional diode laser transmitters in wavelength division multiplexing (WDM) networks. The...
Microscopy Probes Electron Behavior in Lasers
Jul 1, 2003 — Using variants of atomic force microscopy, a group of scientists from the University of Toronto and from Nortel Networks Optical Components in Ottawa has directly investigated the electronic characteristics of a semiconductor laser in operation. The...
Nd:BaYF Laser Produces 2.4 W
Jul 1, 2003 — Lasers based on BaY2F8 (BaYF) have the potential to compete with other neodymium-doped solid-state devices for moderate-power, near-IR applications, a team of scientists in Italy has reported. In recent experiments, the group, which included members...
Novel Chromatic Dispersion Compensation
Jul 1, 2003 — A collaboration between researchers at OFS and Bell labs of Murray Hill and Holmdel, N.J., respectively, has produced a novel system for tunable fiber optic dispersion compensation that is effective with any wavelength division multiplexing (WDM)...
Photonics Examines Brake Noise
Jul 1, 2003 — Most automotive brake noise is little more than an annoyance. But as advances in technology and design have made vehicles quieter, customers have a lower tolerance for these squeals, groans and moans, and the automotive industry is pressed all the...
Shocked Photonic Crystals Tune Light
Jul 1, 2003 — In a series of "numerical experiments," researchers at Massachusetts Institute of Technology in Cambridge have discovered novel frequency-shifting and bandwidth-narrowing phenomena that occur when light interacts with a shock wave in a photonic...
Spectrometer Uses Micromachined Grating
Jul 1, 2003 — In the pursuit of compact spectrometers for a variety of industrial applications, researchers at Fraunhofer Institut für Photonische Mikrosysteme in Dresden, Germany, have developed a device based on a micromechanical scanning grating. They suggest...
Systems Compensate for Polarization Mode Dispersion
Jul 1, 2003 — Dispersion, particularly polarization mode dispersion, becomes increasingly problematic at higher fiber optic data rates because the resulting signal distortion scales as the square of the data rate. Although there are several techniques to...
Blue Polymers Live Longer
Jun 1, 2003 — Unlike liquid crystal devices, light-emitting polymer displays require no backlight, which could ultimately lead to more efficient, thinner, lighter-weight displays. Images also are reportedly of higher quality, even at wide viewing angles. There...
Electron Beam Lithography Produces Microlenses in Hybrid Sol-Gel
Jun 1, 2003 — In the April 21 issue of Optics Express, scientists at Singapore's Nanyang Technological University discuss the use of a hybrid sol-gel glass to fabricate refractive microlenses with electron beam lithography. According to the researchers, this...
Embedded Mirrors Improve Fiber Pumping
Jun 1, 2003 — A new approach for injecting radiation into double-clad fiber promises significant advantages in the production and performance of fiber lasers and amplifiers. Developed at the Naval Research Laboratory in Washington and at Sandia National...
Far-IR Photoconductor Array to Go into Space
Jun 1, 2003 — Scientists from the Communications Research Laboratory in Tokyo have developed what they believe may be the first direct hybrid two-dimensional far-IR detector array. As reported in the April 20 issue of Applied Optics, the Ge:Ga array will be...
Fiber Laser Q-Switched by Stimulated Brillouin Scattering
Jun 1, 2003 — Fiber lasers increasingly are becoming attractive for commercial applications because of their compact and rugged packaging, efficient operation with passive cooling and high beam quality. Recently, a novel approach to passive Q-switching has...
Fiber Optic Sensor Measures Submicroampere Currents
Jun 1, 2003 — Wuu-Wen Lin of Yung Ta Institute of Technology & Commerce in Linluo, Taiwan, has developed a fiber optic sensor that can measure submicroampere currents. A report of the device appeared in the April issue of Optical Engineering. The current...
Laser Spike Welding Enables New Materials and Designs
Jun 1, 2003 — Researchers from Philips Electronics Neder-land BV in Eindhoven and the University of Groningen, both in the Netherlands, have developed a laser welding technique that promises lightweight components for aircraft manufacturers and a host of other...
Laser-Heated Diamond Cell Exposes Stability at Earth's Mantle
Jun 1, 2003 — Using a laser heating system, a team of scientists at Carnegie Institution of Washington and at the University of Chicago has determined that the rock salt structure of magnesiowüstite is stable at the pressures and temperatures of the Earth's lower...
Light Scattering Technique Detects Pathogenic Aerosols
Jun 1, 2003 — The threat of bioterrorism has inspired much research into optical techniques that can detect pathogenic aerosols in real time. Now a team of scientists from Yale University in New Haven, Conn., and the Naval Research Laboratory in Washington has...
Magnetometer Has Subfemtotesla Sensitivity
Jun 1, 2003 — Researchers at Princeton University in New Jersey, working with colleagues at the University of Washington in Seattle, have developed an all-optical atomic magnetometer more sensitive than superconducting quantum interference devices where...
Micromirror System Facilitates Dynamic 3-D Holographic Imaging
Jun 1, 2003 — Scientists at the University of Texas Southwestern Medical Center at Dallas have constructed a proof-of-concept system that projects true dynamic holographic images by computing the hologram of objects in a 3-D scene and then transcribing the 2-D...
Nanowire Combs Lase in UV
Jun 1, 2003 — Researchers at the University of California, Berkeley, have produced novel comblike arrays of zinc-oxide nanowires that produce ultraviolet laser radiation when optically stimulated. If they could be made to lase under electronic injection, the...
Negative Refraction Confirmed
Jun 1, 2003 — The latest salvo in the battle over negative refractive index materials has been fired, and it has proponents of their existence declaring a victory. Independent groups at the Massachusetts Institute of Technology's Media Labor-atory in Cambridge...
Polymer-Dispersed Liquid Crystal Forms Tunable Photonic Crystals
Jun 1, 2003 — Researchers from Brown University in Providence, R.I., have fabricated two- and three-dimensional tunable photonic crystals using polymer-dispersed liquid crystal. They presented the results of their study at the 2003 Optical Fiber Communication...
Prototype of MEMS-Based 320 x 240 Uncooled IR Detector Demonstrated
Jun 1, 2003 — Using an array of heat-sensitive microscopic cantilever elements on its surface, a new MEMS-based detector, developed by Sarcon Microsystems of Knoxville, Tenn., and Sarnoff Corp. of Princeton, N.J., captures images at 320 x 240 pixels. A prototype...
Quantum-Dot Composite LED Emits in IR
Jun 1, 2003 — An electroluminescent composite that features quantum dots suspended in a semiconducting polymer promises to ease the development of advanced optical sources for applications such as telecommunications. Developed at the University of Toronto, a...

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