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To: Peter V who wrote (32074)	4/9/1998 11:13:00 PM
From: BillyG	Read Replies (3) \| Respond to of 50808

Lasers for recordable DVD. From blue to violet...... techweb.cmp.com <<High-power gallium-nitride laser diodes that emit light in the violet region of the spectrum have been developed by Nichia Chemical Industrial Co. Ltd. (Anan, Tokushima). By operating at a shorter wavelength than blue, the laser diodes could allow optical disks to store greater amounts of data, and may find application in other areas that require blue laser light, such as flat-panel displays. Nichia researchers described their work at the recent Spring Meeting of the Japan Society of Applied Physics and Related Societies. Writable power Researchers at Nichia observed single-mode stable emission of up to 80-mW output in the diodes. "DVD applications require 30- to 40-mW power; thus, our lasers can be used for DVDs," said Shuji Nakamura, senior researcher at Nichia. "We are targeting a laser with writable power from the beginning." Nichia has made the commercialization of a short-wavelength laser diode a high priority. "At present, the wavelength at around 400 nm shows the lowest threshold current," Nakamura said, "so a [violet] laser with around 400-nm wavelength will naturally come first." With plans to sample the parts this year, Nichia said its laser diodes promise record performance.>>