Patent ID: 7496124
Filing Date: 2009-02-24
Classification: B82Y,H01S

Abstract:
1. A nitride semiconductor laser device comprising: an n-type semiconductor layer; an active layer having a multi-quantum well (MQW) structure, including a plurality of well layers, each containing In, and a plurality of barrier layers, the active layer being provided on the n-type semiconductor layer; and a p-type semiconductor layer provided on the active layer; wherein the active layer comprises at least one three-layered structure, each said three-layered structure having one of the well layers, a middle layer having a band gap energy larger than that of one of the barrier layers, the middle layer being adjacent to said one of the well layers residing on the side of the p-type semiconductor layer, said one of the barrier layers being adjacent to the middle layer residing on the side of the p-type semiconductor layer.