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http://www.semiconductor-today.com/news_items/2009/FEB/ROHM_230209.htm
Non-polar InGaN lasers near green light
Scientists at Rohm Co Ltd’s R&D headquarters in Kyoto, Japan have extended the wavelength for continuous wave (CW) operation of indium gallium nitride (InGaN) laser diodes (LDs) [Okamoto et al, App. Phys. Lett., vol.94, p.071105, 2009]. The researchers claim that the 499.8nm (near-green) CW lasing wavelength is the longest reported for such devices. Previously, Rohm reported a 481nm blue-green laser last June followed by a 488nm laser in October, while Nichia had reported a 488nm blue-green laser in January 2008. Among the possible applications of laser diodes emitting at green wavelengths (i.e. 490–560nm), when commercialized, could be full-color displays and mobile projectors.
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The goal is 520nm, or thereabouts, and they're getting close over there at Rohm, it sounds like. I've seen the full article (I forgot what journal it was in, I think it was APL though), and their numbers look pretty good. And, the journal article with the 499.8 result was submitted a couple months ago, so who knows what their current devices are doing. Pretty interesting though, we'll see what happens in the next couple of months, it should be an exciting time. Green laser diodes look to be getting closer everyday.
Non-polar InGaN lasers near green light
Scientists at Rohm Co Ltd’s R&D headquarters in Kyoto, Japan have extended the wavelength for continuous wave (CW) operation of indium gallium nitride (InGaN) laser diodes (LDs) [Okamoto et al, App. Phys. Lett., vol.94, p.071105, 2009]. The researchers claim that the 499.8nm (near-green) CW lasing wavelength is the longest reported for such devices. Previously, Rohm reported a 481nm blue-green laser last June followed by a 488nm laser in October, while Nichia had reported a 488nm blue-green laser in January 2008. Among the possible applications of laser diodes emitting at green wavelengths (i.e. 490–560nm), when commercialized, could be full-color displays and mobile projectors.
------------------------------------
The goal is 520nm, or thereabouts, and they're getting close over there at Rohm, it sounds like. I've seen the full article (I forgot what journal it was in, I think it was APL though), and their numbers look pretty good. And, the journal article with the 499.8 result was submitted a couple months ago, so who knows what their current devices are doing. Pretty interesting though, we'll see what happens in the next couple of months, it should be an exciting time. Green laser diodes look to be getting closer everyday.