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Bill Miller, Ph.D., Senior Vice President, General Manager of Veeco’s MOCVD Operations commented “The K465i gives GPI the technology to surpass their LED brightness roadmap objectives, and also provides the industry’s lowest cost of ownership, high productivity and best-in-class yields.”
With superior wavelength uniformity and excellent run-to-run repeatability, the production-proven K465i extends Veeco’s lead in capital efficiency -- the number of good wafers per day for each capital dollar -- for high volume LED manufacturers. The K465i provides ease-of-tuning for fast process optimization on wafer sizes up to 8 inches and fast tool recovery time after maintenance.
Blue-violet Laser Diode Capable Of 8x BD Writing Speeds
Renesas Electronics Corporation announced the company’s first blue-violet semiconductor laser diode
Renesas Electronics Corporation, announced the company’s first blue-violet semiconductor laser diode with a wavelength of 405 nm and a new structure incorporating an optical waveguide into the semiconductor device, which enables high power output and excellent suitability for mass production.
The new blue-violet semiconductor laser diode, part number NV4A61MF, is ideal for Blu-ray disc recording and playback, and features a new inner-stripe structure in which the optical waveguide that substantially influences the quality of the laser diode is incorporated into the semiconductor. In this new structure, the optical waveguide is fabricated on a gallium nitride (GaN) substrate with approximately ten times improved accuracy and 20 percent increased heat dissipation compared to the conventional devices, in which the optical waveguide is formed on the surface of the laser chip. With this innovative structure, the new device provides the following features. (1) It offers high optical power output of 350 milliwatts (mW) suitable for 8x Blu-ray disc recording even at temperatures of up to 85°C; (2) The current and optical output characteristics provide excellent linearity from the low-output range through the high- temperature, high-output range. (3) It reduces laser noise (output fluctuation) that occurs during playback to less than one third of the company’s existing devices, realizing 5 decibel per hertz (dB/Hz) improvement.
The Blu-ray disc drive market has been expanding rapidly as Blu-ray recorders achieved widespread adoption and increasing numbers of Blu-ray disc drives being incorporated in flat-screen TVs and PCs. The market is expected to grow continuously, with sales of 100 million units in fiscal 2011, growing by 150 percent from the previous year. Of these, the number of recorders, which require high output lasers, is expected to amount to 30 million units.
Majority of the existing blue-violet semiconductor laser diodes adopts a ridge- waveguide structure in which dry etching process is used on the semiconductor surface to fabricate an optical waveguide, a path that guides laser light, and current confinement to the light emitting layer, in a ridge formation. In a laser device, the thickness of the cladding layer formed immediately above the light- emission layer directly determines the device
June
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