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Research & Technology News
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 parametric oscillator (OPO) pumped with microsecond pulses from a wavelength-tunable, Q-switched solid-state laser. The laser will have important applications in precision spectroscopy and other applications. OPOs pumped by solid-state lasers in the 1-...
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 Taejon, 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...
Good Splices Make Good Lasers
Nov 1, 2003 — Intracavity losses of a fraction of a percent can cut the output power of a low-gain laser, such as an erbium-doped fiber laser, by a factor of two or more. A significant source of loss in an erbium-doped fiber laser is the splice between the...
Holey Fiber Supports Megawatt Pulses
Nov 1, 2003 — Scientists at Corning Inc. in Corning, N.Y., have developed a hollow-core photonic bandgap fiber that supports ultrashort pulses of infrared radiation with peak powers more than 100 times greater than those tolerated by conventional optical fiber....
Laser Fabricates Waveguides in LiNbO3
Nov 1, 2003 — The two most common approaches for fabricating waveguides in LiNbO3 -- high-temperature in-diffusion of titanium and proton exchange -- are complex, involving high temperatures or acid treatment and at least one photolithographic step. Recently,...
MEMS Enable Tunable Lasers for Telecom
Nov 1, 2003 — Dynamically reconfiguring next-generation fiber optic telecom systems will require wavelength-tunable lasers that can provide a signal into any wavelength division multiplexed channel and that can switch among channels on the fly. Researchers around...
Mode-Locked, Tunable Fiber Laser Is Alternative to Ti:Sapphire
Nov 1, 2003 — Fiber lasers are being developed in laboratories around the world as alternatives to traditional solid-state lasers. The Ti:sapphire laser, however, has remained largely unchallenged as a source of broadly tunable, ultrashort pulses. But now a...
Single-Stage YAG Amplifier Sets Power Record
Nov 1, 2003 — A research group in Japan has achieved 132 W of average green power at 1 kHz by frequency doubling an Nd:YAG master oscillator power amplifier system. Both this second-harmonic power level and the 362 W of average fundamental power at 1 kHz from the...
Nanotechnology Center Planned at Georgia Tech
Oct 30, 2003 — ATLANTA, Oct. 30 -- One of the nation’s most advanced facilities for nanotechnology research is slated for construction at the Georgia Institute of Technology (Georgia Tech), Georgia Gov. Sonny Perdue announced at a recent meeting of the Technology...
'Quantum Pointer' Improves Measurements
Oct 1, 2003 — An optical system called a "quantum laser pointer," developed by scientists at Australian National University in Canberra and at Université Pierre et Marie Curie in Paris, promises to improve measurements of the position of a laser beam. The system...
A New Tunable Optical Filter
Oct 1, 2003 — Tunable optical filters are versatile devices with a place in a host of photonic applications. They are essential in wavelength-flexible wavelength division multiplexing systems, and they also can play a key role in wavelength-tunable lasers for...
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