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Toshiba blue-violet laser targets optical disc systems

Posted: 07 Oct 2003 ?? ?Print Version ?Bookmark and Share

Keywords:Toshiba? blue-violet laser?

Toshiba Corp. has announced development of gallium-nitride based blue-violet lasers that offer an optical output of 200mW, while achieving a noise level of -132dB/Hz. The laser performance meets the requirements for blue violet laser based optical disc systems that will emerge, including the ability to support dual layer and high-speed recording systems requiring a powerful laser.

Laser wavelength is 409nm, threshold current is 35mA, and operation current is 164mA. With a beam angle (parallel) of 12.4C and beam angle (perpendicular) of 25.8, the product has an operational case temperature of 100C.

The product's high quantum efficiency is achieved by precision optimization of the density of impurities used to dope the laser and maximize optical output. This achieves a lower operating current at higher optical power output.

The blue-violet semiconductor laser is an essential component for next-generation optical disc players and drives after current red laser based DVDs. The lasers must achieve high optical output power, low noise performance and a stable beam profile if they are to read and write the highly dense data packed unto next-generation optical discs.

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