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Hamamatsu Corp. - Creating a Better Future LB 1-25
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Research & Technology News

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 normal, single-mode fiber and the erbium-doped fiber, which results from the differing mode patterns in the two types of fiber. Now researchers at National Chiao Tung University in Hsinchu and Chunghwa Telecom Co. Ltd. in Taoyuan, both in Taiwan, have...
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...
Chalcogenide Fibers Show Promise as Raman Lasers
Oct 1, 2003 — Lasers in the 2- to 10-µm region are important for a number of spectroscopic, remote sensing and military applications. Raman fiber lasers offer one approach to such lasers, but the relatively low Raman gain of conventional silica fibers is an...
Crystal Offers High Fourth-Harmonic Conversion Efficiency
Oct 1, 2003 — Few nonlinear crystals are available whose transmission and nonlinearities are compatible with the efficient generation of the fourth harmonic of Nd:YAG at 266 nm. KBe2BO3F2 (KBBF) has many desirable parameters: It has a high damage threshold and...
Crystals Compensate for Birefringence in Polymer
Oct 1, 2003 — The processing of optical polymers in the production of liquid crystal displays (LCDs) and lenses tends to produce birefringence in the materials. Manufacturers may compensate for this phenomenon by using alternative fabrication techniques, such as...
Erbium-Doped Fiber Amplifier Displays Low Noise
Oct 1, 2003 — Most fiber optic systems operate in the 1530- to 1565-nm C-band because the gain of erbium-doped fiber amplifiers peaks in this spectral region. But as the demand for bandwidth grows, many telecom engineers look covetously at the 1565- to 1625-nm...
Fiber Laser Is Wavelength-Tunable for the S-Band
Oct 1, 2003 — A group at the National Chiao-Tung University in Hsinchu, Taiwan, has capitalized on recent successes with S-band erbium-doped fiber amplifiers to design and demonstrate a wavelength-tunable fiber laser for this telecommunications band. Wavelength-...
Grating Enables Tunable Fiber Laser for Telecom
Oct 1, 2003 — Today's fiber optic telecom systems use a different fixed-frequency semiconductor laser to transmit each channel into the optical fiber. If these individual lasers were tunable -- that is, capable of switching from one wavelength channel to another...
Hybrid Bragg Grating Enables Optical Current Sensor
Oct 1, 2003 — Engineers at City University of Hong Kong have demonstrated a compact, inexpensive optical sensor for alternating and direct currents. The sensor, based on a fiber Bragg grating, has a low susceptibility to temperature variations and offers an...
Minilaser Is Tunable, Single-Frequency Source at 1.5 µm
Oct 1, 2003 — A widely tunable, single-frequency laser operating in the 1.5-µm spectral region has application not only in testing and qualifying C-band telecom components, but also in Doppler-shifted velocity measurements and in spectroscopic studies. A group of...
Mode-Locked Ring Laser Produces 274-fs Pulses
Oct 1, 2003 — Scientists at the University of Central Florida in Orlando have developed a "breathing mode" semiconductor laser with mode-locked, externally compressed 274-fs pulses. The approach promises semiconductor lasers capable of producing even shorter...
New Holey Fiber Is Easy to Manufacture
Oct 1, 2003 — Scientists at Virginia Polytechnic Institute and State University in Blacksburg have developed a new form of holey fiber that is easier to fabricate than previous types. They call it "random-hole optical fiber" because the airholes are randomly...
New Semiconductor Lithography Makes a Splash
Oct 1, 2003 — Semiconductor manufacturers are about to be all wet. But that's a good thing. A new technique called immersion lithography could allow the industry to continue tracking Moore's law, which forecasts substantial annual decreases in state-of-the-art...
Quantum Dots Suitable for Computing
Oct 1, 2003 — Quantum computers promise to enable immense computing power in systems based on units of information called qubits, which are similar to the binary bits in today's classical computers but which also can simultaneously represent both a 0 and a 1....
Tunable Dispersion Compensator Uses Micromirrors
Oct 1, 2003 — At Sumitomo Electric Industries Ltd. in Yokoha-ma, Japan, engineers have developed a device based on microelectromechanical systems (MEMS) technology that provides tunable dispersion compensation across the spectrum of channels of a wavelength...
Bidirectional Multiplexer Features Six-Port Circulators
Sep 1, 2003 — Unidirectional optical add/ drop multiplexers are common elements in fiber optic networks, but bidirectional designs have been complex and generally lack flexibility. A team of engineers at the University of Melbourne in Australia recently designed...
Calibration Method Enables Alignment down to 1 µm
Sep 1, 2003 — Alignment of tiny objects is an important task in the photonics industry. Fibers, waveguides and microlenses must be adjusted to maximize light throughput or to prepare for gluing or welding. Unfortunately, imaging systems used for automated...
Diffractive Microlens Cuts Laser Costs
Sep 1, 2003 — Assembly and alignment are major cost drivers in the fabrication of photonic components. Nowhere is this more evident than in the packaging of laser modules for metropolitan optical networks, for which demand is growing rapidly. A team at Oki...

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