Patent ID: 7555025

Claim:
A gallium nitride semiconductor laser device comprising: a substrate, a first cladding layer, an active layer, and a second cladding layer, sequentially arranged, each of said first and second cladding layers and said active layer including at least Ga and N as principal constituents, and having opposed first and second facets defining a cavity extending in a propagation direction of a laser beam, said first facet being located at a first end of said cavity and through which the laser beam is emitted, and said second facet being located on a second end of said cavity; and an adhesive layer and a coating film sequentially disposed on at least one of said first and second facets, said adhesive layer being an anodic oxide film of a material selected from the group consisting of aluminum, titanium, niobium, tantalum, and hafnium, and in contact with at least one of said first and second facets.