InAsP/InGaP all ternary strain-compensated multiple quantum wells and its application to long wavelength lasers

By newly introducing InGaP tensile strained layer as barriers of InAsP compressively strained multiple quantum wells, a high crystalline quality of InAsP/InGaP strain-compensated multiple quantum wells was obtained using metalorganic chemical vapor deposition on (100) InP substrate. Strain compensation was clearly confirmed by the surface morphology, double crystal X-ray measurement and photoluminescence spectrum. A first laser consisting of an all ternary quantum well active layer was successfully fabricated. The threshold current density of 1 kA/cm² was obtained, cavity length of 600 μm, without the use of a separate confinement heterostructure layer. A very low threshold current density of 300 A/cm² was achieved in an improved structure emitting at 1.3 μm