Patent ID: 8477818

Claim:
A gallium nitride (GaN)-based semiconductor laser device comprising: an n-type cladding layer of an n-type GaN-based semiconductor; a first light guide layer of a GaN-based semiconductor provided on the n-type cladding layer; an active layer of a GaN-based semiconductor provided on the first light guide layer; a second light guide layer of a GaN-based semiconductor provided on the active layer; and a p-type cladding layer of a p-type GaN-based semiconductor provided on the second light guide layer, wherein a lasing wavelength of the active layer is not less than 400 nm and not more than 550 nm, wherein the first and second light guide layers both contain indium, wherein each of indium compositions of the first and second light guide layers is not less than 2% and not more than 6%, wherein a film thickness of the first light guide layer is in the range of not less than 65% and not more than 85% of a total of the film thickness of the first light guide layer and a film thickness of the second light guide layer, and wherein the first light guide layer and the second light guide layer are in contact with the active layer.