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Research & Technology News

Compact, Efficient Blue Laser Utilizes Periodically Poled KTP
Jan 1, 2004 — Yet another nail in the coffin of blue gas lasers has been delivered by an international team's demonstration of what it believes is the highest wall-plug efficiency recorded in the blue spectral region from a second-harmonic laser source. By placing a periodically poled KTP crystal inside the resonator of a vertical-extended-cavity surface-emitting laser (VECSEL), the group generated more than 42 mW of 489-nm blue light from 3.25 W of electrical power, for an overall efficiency of...
Laser Strums Silicon 'Nanoguitar'
Jan 1, 2004 — A team of scientists at Cornell University in Ithaca, N.Y., has employed a laser to pluck the strings on a microscopic guitar. The demonstration illustrates the potential of optically driven actuation and detection schemes for future...
Machine Vision System Scans Baked Goods
Jan 1, 2004 — Engineers at Georgia Institute of Technology in Atlanta are working on a way to give everyone perfect buns -- sandwich buns, that is. In collaboration with researchers at Baking Technology Systems Inc. (Bake-Tech) of Tucker, Ga., they are developing...
Photonic Crystal Enables Flat-Lens Imaging
Jan 1, 2004 — A team of scientists at Northeastern University in Boston has demonstrated that it is possible to image using a flat photonic crystal lens that displays negative refraction. The work illustrates the potential of "left-handed materials" for...
Q-Switched CO2 Laser Intended for Heterodyne-Detection Lidar
Jan 1, 2004 — Waveguide CO2 lasers excited by radio-frequency discharges have found broad application as the sources for laser radar systems. In particular, pulsed heterodyne-detection lidar requires a pair of frequency-offset, pulsed lasers. Q-switched,...
Researchers Around the World Obtain Vanadate Improvements
Jan 1, 2004 — Neodymium-doped vanadate has become the crystal of choice for many diode-pumped lasers, primarily because the absorption cross section for 808-nm laser-diode pumping to the neodymium upper laser level is nearly eight times greater than the...
Short Pulses Generated in Mode-Locked Tm-Ho:BaY2F8 Laser
Jan 1, 2004 — Ultrashort mode-locked pulse trains in the 2-µm spectral region are of interest for applications such as time-resolved spectroscopy and optical communications. Moreover, the short pulses enable highly efficient nonlinear conversion into the mid- and...
Solution to the 'Green Problem' Demonstrated
Jan 1, 2004 — Intracavity frequency-doubled solid-state lasers are one of the photonics industry's all-time best sellers because they provide an efficient, compact and rugged source of coherent visible light for applications from surgery to spectroscopy to green...
Spatial Light Modulator Enables Optical Processor
Jan 1, 2004 — Lenslet Ltd. of Herzliyya, Israel, has developed a commercial optical digital signal processor that can perform 8 trillion multiply-and-accumulate operations per second, orders of magnitude faster than current processors. Applications of the...
Tunable Source Produces Microsecond Pulses in the Mid-IR
Jan 1, 2004 — A collaboration among scientists at Nederlands Centrum voor Laser Research bv and the University of Twente, both in Enschede, the Netherlands, and at Laser Zentrum Hannover eV in Germany has resulted in what they believe is the first optical...
Fiber Laser Interrogates Fiber Bragg Grating Sensors
Dec 1, 2003 — Researchers at Texas A&M University in College Station have designed and built a wavelength-scanned, Q-switched, erbium-doped fiber laser that is uniquely suitable for interrogating a series of multiplexed fiber Bragg grating (FBG) sensors even...
Fiber Optic Array Scans the Ocean for Submarines and Oil Wells
Dec 1, 2003 — A group of researchers from the US Naval Research Laboratory in Washington and from QinetiQ in Dorchester, UK, has designed and demonstrated an array of fiber optic sensors that can detect weak underwater acoustic signals across a spectrum of...
Intracavity Pumping of Ho:YAG Laser Boosts Efficiency
Dec 1, 2003 — Both thulium and holmium ions make good infrared lasers when doped into solid-state hosts, thulium lasing at ~1.9 µm and holmium at ~2.1 µm. Thulium has absorption bands corresponding to the wavelengths of commercial diode lasers at 792 nm, but...
Lidar Satellite Resumes Data Collection
Dec 1, 2003 — NASA's Ice, Cloud and land Elevation Satellite is again collecting information on the topography of the Earth's ice sheets; the heights, thicknesses and other properties of cloud and aerosol layers; and the topography of the planet's surface. The...
Multidye Polymer Composite Developed for Data Storage
Dec 1, 2003 — A multidye material developed by researchers from the University of Toronto and Princess Margaret Hospital in Toronto promises applications in ultradense optical data storage and document security as well as in the development of tunable lasers,...
Parametric Oscillator Produces 9- to 10-µm Output
Dec 1, 2003 — Researchers at the University of Southampton in the UK have produced what they believe are the longest wavelengths ever generated in a synchronously pumped optical parametric oscillator (OPO). Based on their success to date, they believe that the...
Periodically Poled KTP Waveguide Crystal Generates Blue Light
Dec 1, 2003 — A collaboration of researchers at the University of St. Andrews in the UK, the University of Sofia in Bulgaria and AdvR Inc. in Bozeman, Mont., has demonstrated a frequency-doubled laser capable of producing ultrashort pulses of 424-nm light with an...
Photonic Crystal Enables Surface-Emitting Quantum-Cascade Laser
Dec 1, 2003 — By incorporating a photonic crystal resonator into the design of a quantum-cascade laser, researchers in the US have developed compact, surface-emitting devices with potential applications in chemical sensing, spectroscopy and imaging. Produced by a...
Silicon-on-Insulator Switch Exhibits Fast Response
Dec 1, 2003 — Planar waveguide devices based on silicon-on-insulator architecture offer the enticing possibility of miniaturization because of the high difference in refractive index between silicon and air (Δn = 2.45) or between silicon and silicon dioxide...
Soft Lithography Reproduces Integrated Optical Devices
Dec 1, 2003 — As more attention is paid to the use of polymeric materials for optical elements, researchers have been investigating soft lithography as a means to reduce fabrication costs by replicating many devices from a single master. Now a team at California...
Three-Dimensional MEMS Device Switches 100 Channels
Dec 1, 2003 — A compact, 100-channel, microelectromechanical systems (MEMS) optical cross connect has been designed and built by a team of NTT Corp. engineers in Kanagawa, Japan. The device utilizes a pair of 10 X 10 MEMS micromirror arrays and can switch the...
'One and the Same' Atom Laser Displays Unique Behavior
Nov 1, 2003 — Scientists investigating one-atom at California Institute of Technology in Pasadena lasers have developed a device that displays no threshold for lasing and uniquely regular emissions. Unlike previous one-atom lasers and masers, which operate by...
Amps Can Provide Flat Gain Across C-, L-Bands
Nov 1, 2003 — A research group at the Electronics and Telecommunications Research Institute in Taejon, South Korea, has shown that it is mathematically possible to obtain relatively flat gain across the C- and L-bands by combining the gain from erbium ions'...
Bookham Agrees to Acquire New Focus
Nov 1, 2003 — Following the acquisition of California companies Cierra Photonics of Santa Rosa and Ignis Optics Inc. of San Jose, Bookham Technology plc has signaled its intent to extend its acquisition strategy outside the telecom arena. The Abingdon, UK-based...
Double-Pass Amplifier Delivers High Gain and Low Noise
Nov 1, 2003 — Researchers at Universiti Putra Malaysia in Serdang have conceived and implemented a double-pass amplifier that incorporates a narrow-bandpass filter between the first and second passes to filter out amplified spontaneous emission. The amplifier has...

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