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Proceedings Paper

High-power blue-violet laser diodes for next-generation optical disc systems
Author(s): Masayuki Shono; Yasuhiko Nomura; Yasuyuki Bessho
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Paper Abstract

High-power and low-noise characteristics are strongly required for blue-violet laser diodes in practical application to next generation optical disc systems. We have successfully fabricated blue-violet laser diodes meeting these requirements. These laser diodes have a ridge waveguide structure with a dielectric current blocking layer. Improving the crystal quality of the grown materials on a GaN substrate and optimizing the optical confinement in the emission layer have achieved a kink level as high as 250 mW. Optimized optical confinement is also assumed to result in a good beam profile with no fringe. In addition to this, since the threading dislocation density at the emission layer below the ridge portion is reduced to less than 10 5cm-2, these laser diodes have been operating reliably for more than 1000 h with a light output power of 100 mW at 60 °C under pulsed operation. This light output power makes it possible to realize dual layer recording systems. We have also confirmed that these laser diodes have a noise level as low as -130 dB/Hz for a light output power of 5 mW.

Paper Details

Date Published: 9 September 2004
PDF: 6 pages
Proc. SPIE 5380, Optical Data Storage 2004, (9 September 2004); doi: 10.1117/12.562510
Show Author Affiliations
Masayuki Shono, SANYO Electric Co., Ltd. (Japan)
Yasuhiko Nomura, SANYO Electric Co., Ltd. (Japan)
Yasuyuki Bessho, SANYO Electric Co., Ltd. (Japan)


Published in SPIE Proceedings Vol. 5380:
Optical Data Storage 2004
B. V. K. Vijaya Kumar; Hiromichi Kobori, Editor(s)

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