Improvement in operation lives of GaAlAs visible lasers by introducing GaAlAs buffer layers

It is shown that drastic reduction of the active-layer stress can be obtained by the introduction of a GaAlAs buffer layer in GaAlAs visible lasers. The life tests of the GaAlAs visible lasers with the optimally designed buffer layers were carried out at 50°C in a dry nitrogen ambient. The results indicate that the introduction of the optimal buffer layer leads to a reduction in the stress induced degradation of GaAlAs visible lasers.