Lasers ♦ news digest
other was lit by a standard incandescent bulb. The aesthetic quality of diode laser lighting (left bowl) compares favourably with standard incandescent lighting (right). (Photo by Randy Montoya).
The results probably won’t start a California gold rush of lighting fabricators into diode lasers, said Tsao, but they may open a formerly ignored line of research. Diode lasers are slightly more expensive to fabricate than LEDs because their substrates must have fewer defects than those used for LEDs. Still, he said, such substrates are likely to become more available in the future because they improve LED performance as well.
for the multibillion dollar lighting industry. The so- called ‘‘smart beams’’ can be adjusted on site for personalised colour renderings for health reasons and, because they are directional, also can provide illumination precisely where it’s wanted.
Colourimetric and experimental guidance was provided by the National Institute of Standards and Technology.
Further details of this research is available in the paper, “Four-color laser white illuminant demonstrating high color-rendering quality” by Neumann et al, Optics Express, 19, Issue S4, pp. A982-A990 (2011)
http://dx.doi.org/10.1364/OE.19.00A982.
This work was conducted as part of the Solid-State Lighting Science Energy Frontier Research Centre, funded by the U.S. DOE Office of Science.
Four laser beams — yellow, blue, green and red — converge to produce a pleasantly warm white light. Results suggest that diode-based lighting could be an attractive alternative to increasingly popular LED lighting, themselves an alternative to compact-florescent lights and incandescent bulbs. (Photo by Randy Montoya).
Also, while blue diode lasers have good enough performance that the automaker BMW is planning their use in its vehicles’ next-generation white headlights, performance of red diode lasers is not as good, and yellow and green have a ways to go before they are efficient enough for commercial lighting opportunities.
Still, says Tsao, a competition wouldn’t have to be all or nothing. Instead, he said, a cooperative approach might use blue and red diode lasers with yellow and green LEDs. Or blue diode lasers could be used to illuminate phosphors — the technique currently used by fluorescent lights and the current generation of LED-based white light — to create desirable shades of light.
The result makes possible still further efficiencies
Intel Senior Fellow to be Keynote Speaker at CS Europe Conference
Robert S. Chau, Intel Senior Fellow, Technology and Manufacturing Group Director, Transistor Research and Nanotechnology, Intel Corporation will act as Key Note Speaker at the CS Europe Conference, March 2012, Frankfurt.
Following the success of CS Europe 2011, next year’s conference is expanding to 2 days and offers a fantastic mix/quality of speakers making it the must attend industry event for 2012.
Please register at
www.cseurope.net and remember to book your delegate place now as numbers will be limited.
The conference will take place on 12th and 13th March 2012 at the Hilton Hotel, Frankfurt, Germany.
It will feature a mix of insightful market research presentations and cutting-edge research destined to shape tomorrow’s compound semiconductor industry.
November/December 2011
www.compoundsemiconductor.net 169
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