A new sulfur diffused stripe-geometry DH laser

A new type of internally striped planar (ISP) DH lasers is developed with using a new Sulfur selective diffusion technique. The increase of the threshold ratio with the narrowing of the stripe width is more gentle for stripe width range near 10 µm in the laser than in both Zn-diffused planar and proton-bombardment stripe-geometry lasers. Single transverse mode operation with nearly constant width is confirmed up to 100 °C and up to three times of a threshold. Room-temperature CW lasers stably operate over more than 3000 hours. Any deterioration of laser characteristics caused by S atom and its diffusion process is not observed. Sulfur selective diffusion is one of most promising technique for long life lasers and other devices.