Patent ID: 10305257

Abstract:
A semiconductor laser device includes an n-type nitride semiconductor layer; a first layer disposed above the n-type nitride semiconductor and composed of InaGa1-aN (0≤a<1); a second layer disposed above the first layer and composed of InbGa1-bN (0<b<1, a<b), the second layer having a thickness smaller than that of the first layer and containing an n-type impurity; a third layer composed of IncGa1-cN (0≤c<1, c<b) and having a thickness smaller than that of the second layer, the third layer being disposed on (i) a surface of the second layer on the active layer side and/or (ii) a surface of the second layer on the first layer side; an active layer disposed above the second layer and the third layer, and having a single quantum well structure or a multiple quantum well structure; and a p-type nitride semiconductor layer disposed above the active layer.