Patent ID: 8194711

Claim:
A nitride semiconductor laser device comprising: a multilayer structure including a plurality of nitride semiconductor layers including a light emitting layer, the multilayer structure having cavity facets facing each other; and a plurality of protective films made of a dielectric material provided on one of the cavity facets, wherein the plurality of protective films include a first protective film, a second protective film and a third protective film, the first protective film contacts the cavity facet and is made of aluminum nitride, the second protective film is provided on a surface opposite to the cavity facet of the first protective film and is made of a material different from that of the first protective film, the third protective film is provided on a surface opposite to the first protective film of the second protective film and is made of the same material as that of the first protective film, the first and third protective films contain silicon, and the first protective film has a higher silicon concentration than that of the third protective film.