Patent ID: 7221690
Filing Date: 2007-05-22
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser in which an n-type semiconductor layer, an active layer, and a p-type semiconductor layer are stacked in this order on a substrate; the semiconductor laser comprising an intermediate layer sandwiched between the active layer and the p-type semiconductor layer and composed of a gallium nitride-based compound semiconductor; the intermediate layer having a stacked structure comprising an undoped layer including no intentionally added impurities and a diffusion-blocking layer doped with an n-type impurity and substantially not doped with a p-type impurity; and the diffusion-blocking layer being located at a side adjacent to the p-type semiconductor layer; wherein the concentration of the n-type impurity in the diffusion-blocking layer is not lower than about 1E19 cm