Patent ID: 8953656
Filing Date: 2015-02-10
Classification: B82Y,H01S

Abstract:
1. A Group III nitride semiconductor laser device comprising: a laser structure including a support substrate and a semiconductor region, the support substrate having a semipolar primary surface comprised of a hexagonal Group III nitride semiconductor, and the semiconductor region being provided on the semipolar primary surface of the support substrate; and an electrode extending in a direction of a waveguide axis indicative of a direction of a waveguide in the Group III nitride semiconductor laser device, the electrode being provided on the semiconductor region, the semiconductor region having a first gallium nitride based semiconductor layer, a second gallium nitride based semiconductor layer and an active layer, the active layer being provided along a normal axis to the semipolar primary surface, the first gallium nitride based semiconductor layer having a first conductivity type, the second gallium nitride based semiconductor layer having a second conductivity type, the c-axis of the hexagonal Group III nitride semiconductor of the support substrate being inclined at an angle ALPHA relative to the normal axis toward the direction of the waveguide axis, the laser structure including first and second fractured faces, the first and second fractured faces intersecting with the waveguide axis, a laser cavity of the Group III nitride semiconductor laser device including the first and second fractured faces, an end face of the support substrate and an end face of the semiconductor region being exposed in each of the first and second fractured faces, the laser structure including first and second faces, and the first face being a face opposite to the second face, each of the first and second fractured faces extending from an edge of the first face to an edge of the second face, the semiconductor region including an InGaN layer, the first fractured face including a step defined by an end face of the InGaN layer, wherein a normal axis of the step defined by the end face of the InGaN layer is not orthogonal to the normal axis of the semipolar primary surface, and the step defined by the end face of the InGaN layer extending in a direction from one side face to the other side face of the Group III nitride semiconductor laser device.