The owner of a patent relating to doping processes in wide bandgap semiconductors has asked the ITC to exclude products that use LEDs and lasers that infringe the patent.
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The U.S. International Trade Commission (ITC) has agreed to investigate a complaint that seeks to block the importation of a wide array of LEDs, lasers and consumer electronics products into the USA.
The action alleges that 30 major electronics manufacturers in Asia and Europe have violated a patent for producing GaN-based LEDs and laser diodes; such components are used in products such as Sony Blu-ray players, Motorola Razr phones and Hitachi camcorders.
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Lord Rayleigh wrote about the two-dimensional whispering gallery mode (WGM) in 1910 after a visit to the dome of St. Paul’s Cathedral in London.
The whispering cave mode (WCM) is a three-dimensional (3-D) effect - a toroid with circular helix symmetry which recent studies have shown can be used to create photonic-quantum-ring (PQR) lasers that emit in the blue-violet part of the spectrum.
A research team at Pohang University of Science and Technology (POSTECH, Pohang, Korea) first created 3-D WCM lasers that emit in the infrared and red part of the spectrum.
To achieve this, Professor O’Dae Kwon and his group stacked mesas of vertically reflecting distributed-Bragg-reflector (DBR) structures above and below a few active 80 Å gallium arsenide and gallium indium phosphide quantum wells.
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By Chris Lee | Published: January 28, 2008
I spend a lot of my time writing about optics, but I usually focus on visible light or the infrared. This isn’t because I am not interested in ultraviolet light or even shorter wavelength light sources; rather, that really good light sources in this wavelength range are hard to find. It is really hard to perform extreme ultraviolet light experiments when you have no light source.
At present, the only good sources in this spectral range come from synchrotrons, which make them expensive—resulting in a very conservative approach to experiments. Now, some exciting new developments in generating extreme ultraviolet (EUV) and soft X-ray light offer the possibility of escaping the tyranny of the synchrotron.
There are two general methods for developing light sources in this color region: build a new laser or use a nonlinear medium to progressively change the color of an existing laser. Excitingly, new research indicates that combining the two approaches may be the best solution.
First, we’ll take a look at how an EUV laser is constructed, then how nonlinear optics for EUV generation works, and finish off by combining the two.
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Laser TV is a proposed new video display technology using laser optoelectronics. Although proposed as long ago as 1966, laser illumination remained too costly and too poor in performance to viably replace lamps except in some rare ultra-high-end projectors.
At the Las Vegas Consumer Electronics Show in 2006, Novalux Inc., developer of Necsel™ semiconductor laser technology, demonstrated their laser illumination source for projection displays and a prototype rear-projection “laser” TV.
First reports on the development of a commercial Laser TV were published as early as 2006-02-16 with a decision on the large-scale availability of laser televisions expected by early 2008.
On January 7, 2008, at an event associated with the Consumer Electronics Show 2008, Mitsubishi Digital Electronics America, a key player in the LED laser market, unveiled their first commercial Laser TV, a 65″ Full HD model.
A Laser TV requires lasers in three distinct wavelengths: Red, Green and Blue. While red laser diodes are commercially available, there are no commercially available green and blue laser diodes which can provide the required power at room temperature with an adequate life time. Instead frequency doubling can be used to provide the blue and green wavelengths.
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Photonic Products, the UK optoelectronics device manufacturer and laser diode specialist, is pleased to announce that Sanyo’s tiny blue-violet laser diodes are now available in industrial strength and power: three new 405nm laser diodes which offer 20mW, 45mW or a massive 85mW optical output power, the highest power available in a single mode laser diode with an internal monitor photodiode.
This internal monitor photodiode, which can be used to accurately stabilise and control the optical output power, plus their stable beam structure, lower noise and lower current consumption, enables these new Sanyo blue-violet laser diodes to offer the performance required for critically demanding industrial and medical applications such as biomedical instrumentation, medical imaging, fluorescence, high-resolution printing, advanced DVD and industrial alignment.
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Applications requiring low-power lasers are expected to drive growth in the laser projection market, according to the latest report from Insight Media.
The first application to use laser projectors is expected to be rear-projection television (RPTV), driven primarily by the price and availability of lasers. That’s according to market analyst Insight Media, who also predicts that the largest single market will be pico-projectors – with sales projected to reach millions by 2012.
The report, entitled “2007 Laser Projection Systems: A study of the use of lasers as an illumination source for projection systems’, predicts that applications requiring the lowest power lasers will drive growth in the laser projection market.
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Blogger, Kipkay, the Top Producer on the video website www.Metacafe.com, explains how to turn a Star Trek Phaser into a Blu-Ray Laser Phaser! Captain Kirk would have loved to have one of these in his arsenal of goodies and now he can.
Typical blu-ray lasers are very expensive but he found an inexpensive source for obtaining one. The Playstation 3 games system from Sony has a blu-ray laser diode in it. Rather than spend $400 for a Playstation 3 only to destroy it which made no sense, he found a replacement laser assembly (KEM-400AAA) on a popular auction site for $45. Then, he picked up the Star Trek Classic Phaser, also on that auction site, for $30. Now it’s time to “boldly go where no man has gone before.”
You will need to have some electronics experience to build this as well as some tools. You will need: a Soldering Iron & Solder, small screwdrivers, X-Acto Knife, hot glue or epoxy, a Dremel tool, wire, wire snips and pliers or vice-grips.
In addition to the blu-ray diode and the Star Trek Phaser, you will also need a diode housing. Kipkay picked one up from Aixiz International, a 9 volt battery, a 150 ohm resistor and a momentary switch. He used a part # 275-1556 from Radio Shack.
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Photonic Products, the UK opto-electronics device manufacturer and laser diode specialist, has introduced 405nm (blue-violet) laser diode modules with TTL modulation which have been designed as a complete OEM laser diode system.
The modules are extremely stable and reliable, ideal for use in medical applications such as biomedical instrumentation, imaging, spectroscopy, fluorescence sensing, microscopy and many other emerging technologies.
They produce either an elliptical output beam of 4 x 1.5mm with output power of 4mW, or a 2mm circular output beam with output power of 0.9mW.
The TTL modulation will accept signals from DC up to 1 kHz minimum and can be used to enable, inhibit or modulate the laser.
The glass AR coated optical lens may be adjusted to produce either a collimated beam or focused spot. The standard lens may be replaced by other optical systems such as line generators.
Operating voltage is from 8V to 12V DC at an operating current of 90mA, or 100mA. Beam divergence is <0.6mrad for the circular output beam and <0.6 x 0.3mrad for the elliptical output beam. Operating temperature range is -10°C to +50°C.
The modules are cylindrical with an optional 25mm mounting flange and consist of an aluminium housing, laser diode, drive circuit and collimating lens. Mechanical dimensions are a compact 12 mm diameter x 43mm length. Electrical connections are made via external flying leads.
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