News Article
Violet Laser For High-density Storage
Taiwans National Central University (NCU) has reported successful operation of electrically pumped violet laser diodes, developed on their Aixtron AIX 200/4 RF deposition system.
Taiwans National Central University (NCU) has reported successful operation of electrically pumped violet laser diodes, developed on their Aixtron AIX 200/4 RF deposition system.
Violet laser diodes in next generation DVD drives could enable a boost in capacity to 27GBytes (13 hours of video) from today's 4.7Gbytes based on 640nm laser diodes.
NCU's laser diode emits at 410nm and shows lasing above threshold currents of 10kA/cm2. The device consists of a 5x1000micron index guided ridge wave-guide laser structure, which is grown directly on a sapphire substrate. The buffer layer consists of 2micron GaN and 1.5micron AlGaN (xAl~8%).
NCU is the second R&D group in Taiwan to develop a GaN blue laser, after OES who achieved 415nm/7.2kA/cm2 also on an AIXTRON Planetary System (AIX 2000 HT).
