Patent ID: 7858992
Filing Date: 2010-12-28
Classification: B82Y,H01S

Abstract:
1. A nitride semiconductor laser device comprising a nitride semiconductor substrate and a plurality of nitride semiconductor layers laid on top thereof, wherein the nitride semiconductor layers include an active layer having a quantum well structure by being composed of one or more well layers and one or more barrier layers, and an acceptor doping layer, wherein a ridge-stripe portion is formed in a surface of the nitride semiconductor layers, wherein the nitride semiconductor substrate has a C plane region terminated with a Ga facet, and a c-plane region terminated with a N facet, which is a region excluding the C plane region terminated with the Ga facet, wherein a topmost surface of the nitride semiconductor substrate is inclined relative to a C axis of the nitride semiconductor substrate at an angle in a range of 0.2° to 2.0° in a direction perpendicular to the ridge-stripe portion, wherein an off-angle in a direction parallel to the ridge-stripe portion is equal to or less than an off-angle in the direction perpendicular to the ridge-stripe portion, and wherein the nitride semiconductor layers are formed right above the c-plane region terminated with the N facet and the C plane region terminated with the Ga facet, and have a depression right above the c-plane region terminated with the N facet.