Thursday, November 20, 2014
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
Intel To Release Chromecast-like Thumb-sized PCs
Google Contributor Lets You Pay And And See No Ads In Your Favorite Sites
Intel Gives Upbeat Outlook for 2015 Revenue
Hon Hai, Innolux Invest In New Flat-panel Plant In Taiwan
"NotCompatible" Malicious Software Spread on Android Phones
Kindle Owners get Access To Washington Post app
Microsoft Slashes Prices Of Xbox One, Surface 3 For Black Friday
Updated Billboard To Include Streams, Track Sales
Active Discussions
cdrw trouble
CDR for car Sat Nav
DVD/DL for Optiarc 7191S at 8X
Copied dvd's say blank in computer only
Made video, won't play back easily
New Features In Firefox 33
updated tests for dvd and cd burners
How to generate lots of different CDs quickly
 Home > News > Optical Storage > SEI ini...
Last 7 Days News : SU MO TU WE TH FR SA All News

Friday, April 18, 2003
SEI initiates mass-production of 2-inch low-dislocation GaN single crystal substrate for violet lasers


Sumitomo Electric Industries, (SEI) announced the mass-production of 2-inch gallium nitride (GaN) substrate. GaN substrate is essential to the stable manufacture of the high-power, high-quality violet lasers used in next generation high-capacity optical disc equipment that supports 'Blu-ray Disc' and 'Advanced Optical Disc (AOD)' optical disc formats. SEI anticipates that the market for GaN substrate will expand as the demand for next generation high-capacity optical disc equipment increases, and will foster GaN substrate production as the third element of its compound semiconductor business, beside gallium arsenide and indium phosphide. Monthly production capacity has started at 200, and will increase to 500 by October.

Conventional DVD players typically use red lasers, which depend on gallium arsenide (GaAs) as their light source for reading and writing data from and to optical discs. However, in order to record and playback digital terrestrial HDTV programs, it is necessary to use next generation high-capacity optical disc equipment, which has more than five times the capacity of conventional equipment.

A violet laser, which has a shorter wavelength than a red laser, is used in such equipment.A violet laser utilizes a laser emission from the GaN epitaxial layer. In the epitaxial growth of GaN, sapphire substrates are commonly used. Since the physical properties of sapphire substrates and GaN are different, sapphire substrates cause dislocation density to become extremely high; cleavage grows to an unsatisfactory level which reduces the output power and lifetime of the laser. As a result, there has been strong demand for high-quality (low-dislocation), large-diameter GaN substrate. Although there is an active development effort for GaN substrate throughout the world, fabrication of GaN substrate was said to be extremely difficult because nitrogen's decomposition pressure is large.

Using its experience in crystal growth and the processing of other compound semiconductors (GaAs and InP), SEI has developed a GaN substrate that has following features:

(1) Large diameter (2 inches)
(2) Low dislocation density (in the order of 100,000 or less per square centimeter)
(3) Better cleavage, which is vital to a high-performance laser.

SEI has extensive experience in the development and manufacture of GaAs and InP. GaAs is used in near infrared semiconductor lasers for CD players and in red semiconductor lasers for DVD players. InP is used in infrared semiconductor lasers for optical communication equipment. SEI is the world's leading manufacturer of GaAs and InP, supplying its compound semiconductor products to more than 100 companies in Japan, Europe, the U.S., and Asia.

Using its experience in the development and production of GaAs and InP, SEI started developing GaN substrate in 1995, and succeeded in developing 2-in GaN substrate in 2000. SEI gained proficiency in the production of 2-in GaN substrate through sample shipment to major Japanese laser device manufacturers, and initiated mass-production and sales this month.


Previous
Next
BenQ announces new portable DVD player        All News        BenQ announces new portable DVD player
BenQ announces new portable DVD player     Optical Storage News      BenQ announces new portable DVD player

Get RSS feed Easy Print E-Mail this Message

Related News
Pioneer Introduces New High-end Blu-ray Players At CEDIA
Blu-ray Discs For 4K Content And 4K Players Coming Next Year
New BD-DSD Blu-ray Disc Standard Allows Storing 200GB Of Data Per Disc
Optical Disc Sales Down
DVD And Blu-ray Discs Remain Popular in Britain
Blu-ray Disc Format Moving From Consumers To Professionals
Pioneer BDP-170 Blu-ray Disc Player Comes With Wi-Fi, Miracast And Youtube Connectivity
Sony And Panasonic Create New "Archival Disc" 300GB Optical Disc Standard
DVD And Blu-ray Discs Remain Preferred Sources of Video Content
TOSHIBA 2014 Symbio Streaming And Disc Players Coming in Q1
Samsung Says 4K Content Will Be Distributed In 125GB Blu-ray Disks
Blu-ray Closes Gap with DVD in Revenue Generation for Video Releases

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2014 - All rights reserved -
Privacy policy - Contact Us .