Patent ID: 8923354
Filing Date: 2014-12-30
Classification: B82Y,H01L,H01S

Abstract:
1. A nitride semiconductor laser comprising: a support base having conductivity, the support base including a primary surface, the primary surface comprising a gallium nitride based semiconductor; an active layer provided on the primary surface; and a p-type nitride semiconductor region provided on the primary surface, the primary surface being tilted with respect to a reference plane, the reference plane being perpendicular to a reference axis, the reference axis extending in a direction of a c-axis of the gallium nitride based semiconductor, the active layer being provided between the support base and the p-type nitride semiconductor region, the p-type nitride semiconductor region including a p-type cladding region, the p-type cladding region including a first p-type group III nitride semiconductor layer and a second p-type group III nitride semiconductor layer, the first p-type group III nitride semiconductor layer being provided between the second p-type group III nitride semiconductor layer and the active layer, the first p-type group III nitride semiconductor layer including an AlGaN layer, the second p-type group III nitride semiconductor layer comprising material different from material of the AlGaN layer of the first p-type group III nitride semiconductor layer, the AlGaN layer including anisotropic strain, the AlGaN layer of the first p-type group III nitride semiconductor layer having a largest band gap energy in the p-type cladding region, and the second p-type group III nitride semiconductor layer having a resistivity lower than a resistivity of a first p-type group III nitride semiconductor layer, wherein a thickness of the p-type cladding region ranges from 300 nm to 1000 nm, and the first and second p-type group III nitride semiconductor layers have thicknesses d the first p-type group III nitride semiconductor layer being in physical contact with the second p-type group III nitride semiconductor layer, the material of the first p-type group III nitride semiconductor layer is AlGaN, and the first p-type group III nitride semiconductor layer is made of AlGaN and does not include any other layer of material different from AlGaN.