Patent ID: 7792172

Claim:
A nitride semiconductor laser device having a multilayer structure formed by stacking a plurality of nitride semiconductor layers made of hexagonal nitride semiconductors, wherein said multilayer structure is provided with a waveguide structure for guiding a laser beam, said nitride semiconductor layers forming said multilayer structure are stacked in a direction substantially perpendicular to the c-axes of said hexagonal nitride semiconductors constituting said nitride semiconductor layers, a first cavity facet forming a side surface of said waveguide structure is a c-plane having Ga-polarity, a second cavity facet forming another side surface of said waveguide structure opposed to said first cavity facet is a c-plane having N-polarity, a crystalline nitrogen-containing film is formed on the surface of said first cavity facet, and the reflectance of said first cavity facet is smaller than the reflectance of said second cavity facet.