High-power blue-violet laser diodes for next-generation optical disc systems
| Autor: | Masayuki Shono, Yasuhiko Nomura, Yasuyuki Bessho |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.562510 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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