Patent ID: 9444225
Filing Date: 2016-09-13
CPC Classification: B82Y,H01S

Claim Text:
1. A semiconductor laser device for generating blue-violet light with an emission wavelength of 400 nm to 410 nm, comprising: an n-type group III nitride semiconductor layer including an active layer laminated on the n-type group III nitride semiconductor layer and having an InGaN quantum well layer; a p-type group III nitride semiconductor layer laminated on the active layer, the p-type group III nitride semiconductor layer including a transparent electrode in contact with the p-type group III nitride semiconductor layer, the transparent electrode serving as a clad; and an insulating film disposed between the p-type guide layer and the transparent electrode, the insulating film having a flat surface and an opening penetrating through the insulating film so as to expose the flat surface of the p-type guide layer through the opening, wherein the p-type guide layer is disposed between the active layer and the transparent electrode, the p-type contact layer is disposed between the p-type guide layer and the transparent electrode, the p-type contact layer being in contact with the transparent electrode on one surface thereof within the opening of the insulating film and in contact with the flat surface of the p-type guide layer on the other surface thereof within the opening of the insulating film, the n-type guide layer is disposed between the n-type clad layer and the active layer, the superlattice layer, in which an InGaN layer and an Al the In composition of the InGaN layer is lower than the In composition of the InGaN quantum well layer, and the transparent electrode includes