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To: DiViT who wrote (41886)	6/10/1999 4:07:00 PM
From: BillyG	Respond to of 50808

Sony laser for Playstation emits two wavelengths eetimes.com By Yoshiko Hara EE Times (06/10/99, 3:20 p.m. EDT) TOKYO — Sony Corp. and its wholly owned subsidiary Sony Computer Entertainment Inc. have codeveloped a laser module that emits 650- and 780-nanometer laser beams from a single device. Intended for use in DVD and CD players, the laser will allow the companies to use a single device across different types of optical-disk systems to cope with the need for compatibility across different product lines. The target of the device development is the next generation of Sony's Playstation, but the technology will eventually be applied to other optical-disk systems, including rewritable systems, a Sony spokesman said. The device contains two emitting layers in one chip, a technological first, the companies said. Researchers used proprietary metal-organic chemical-vapor deposition (MOCVD) technology to develop the distinct emitting lasers in parallel on one substrate. Sony's semiconductor lasers are based on a "gain guide" structure, a simple design but one in which it is generally considered difficult to control the doping during fabrication. Sony overcame this hurdle, and hence was able to use the simpler structure to its advantage by putting two lasers on one chip. Each laser beam has 5 milliwatts of output power. Sony Computer Entertainment expects that the new device — which is the same size as a conventional 780-nm laser — will reduce the number of components in the next spin of Playstation, lower the cost and increase reliability, since the emitting position of the device is precisely fixed.