Patent ID: 7852892
Filing Date: 2010-12-14
Classification: H01S

Abstract:
1. A ridge stripe semiconductor laser device, comprising a first conductivity type cladding layer, an active layer, a second conductivity type first cladding layer, an etching stop layer, a second conductivity type second cladding layer formed as a stripe-shaped ridge, and a current blocking layer formed in a region except for at least a part on the ridge these layers being disposed on a compound semiconductor substrate, wherein an orientation of a surface of the semiconductor substrate on which these layers are disposed is tilted by a predetermined angle from a (100) plane, wherein in a cross-section perpendicular to a stripe direction of the ridge, each of both lateral surfaces of the ridge comprises the first surface and the second surface are connected via a third intermediate surface, the third intermediate surface is on each of both lateral surfaces of the ridge, a (111) plane of a semiconductor constituting the second cladding layer is exposed in the second surface, and wherein the (111) plane is exposed in at least 50% of an area of the second surface.