Patent ID: 8526477

Claim:
A semiconductor laser diode comprising: a substrate; an n-type layer of an n-type nitride semiconductor on the substrate; an active layer of a nitride semiconductor on the n-type layer; a p-type layer of a p-type nitride semiconductor on the active layer, the p-type layer having a ridge stripe shape; and an end-face layer of a nitride semiconductor formed on an end face of the n-type layer, the active layer, and the p-type layer, the end face being perpendicular to an extension direction of the ridge stripe shape, the end-face layer having a band gap wider than the active layer, the end-face layer having Mg (Magnesium) concentration in the range of 5×10 16 atoms/cm 3 to 5×10 17 atoms/cm 3 at a region adjacent to the p-type layer, wherein a thickness of the end-face layer in the extension direction of the ridge stripe shape is 10 μm or larger.