Patent ID: 7555026

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 cladding layer, said active layer, and said second cladding layer including 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 on a first end of said cavity and through which the laser beam is emitted and second facet being on a second end of said cavity; and a Ga-containing anodic oxide film on at least one of said first and second facets, said anodic oxide film being formed by anodizing at least one of said first cladding layer, said active layer, and said second cladding layer at at least one of said first and second facets.