Comparison between tensile-strained AlGaInP SQWand MQWLDs emitting at 615 nm

Abstract
The optimum design for tensile-strained quantum-well structures, and the laser characteristics of AlGaInP LDs emitting at 615-635 nm are investigated. MQW structures are effective in reducing threshold currents at wavelengths shorter than 620 nm. The lowest threshold current of 95 mA at 20°C is attained in a quaternary MQW LD emitting at 615 nm.