Patent ID: 9312659
Filing Date: 2016-04-12
CPC Classification: B82Y,H01S

Claim Text:
1. A nitride semiconductor laser element comprising: a semiconductor laminate made of a group III nitride semiconductor and including a light-emitting end surface; and a protection film formed of a dielectric multilayer film formed to cover the light-emitting end surface of the semiconductor laminate, wherein the protection film includes an end surface protection layer and an oxygen diffusion suppressing layer, and the end surface protection layer and the oxygen diffusion suppressing layer are disposed in order of the end surface protection layer and the oxygen diffusion suppressing layer from a side of the light-emitting end surface; the end surface protection layer is a layer including a crystalline aluminum nitride film; the oxygen diffusion suppressing layer includes at least a single layer of a metal oxide film and at least a single layer of a silicon oxide film, and the silicon oxide film and the metal oxide film are disposed in this order from a side of the end surface protection layer; and the metal oxide film is crystallized by laser light emitted from the light-emitting end surface, and the metal oxide film is aluminum oxide film.