High-Power 660-nm-Band AlGaInP Laser Diodes with a Small Aspect Ratio for Beam Divergence

High-power 660-nm-band AlGaInP laser diodes with a small aspect ratio have been successfully fabricated with a window-mirror structure. The relationship between optical confinement in the perpendicular direction and internal loss was investigated, and a real index-guided structure with an AlInP current blocking layer was applied on the basis of this investigation. A high-power laser diode with a small aspect ratio of 1.65 for beam divergences of 16.5° and 10° in the perpendicular and parallel directions, respectively, has shown a high kink level of 160 mW and a high maximum light output power of 180 mW under pulsed condition. These laser diodes have operated stably for more than 1500 h with a light output power of 90 mW at 60°C under pulsed condition. Stable pulsed operation at 60°C with a high power of 90 mW and small aspect ratio of 1.65 have been simultaneously achieved for the first time.