STRIPE-GEOMETRY DOUBLE HETEROSTRUCTURE JUNCTION LASERS: MODE STRUCTURE AND cw OPERATION ABOVE ROOM TEMPERATURE

Double heterostructure GaAs junction lasers have been operated continuously at temperatures up to 355°K by use of the advantageous thermal properties of the stripe-geometry configuration. Spatial and spectral characteristics of the modes of these lasers are reported. For the direction perpendicular to the junction plane, these observations show that the field distributions are more symmetrical, the focusing is stronger, and operation in high-order modes is more easily achieved than in homostructure (diffused) junction lasers. For the direction along the junction plane, no significant differences are found between double heterostructure and homostructure lasers.