Patent ID: 8446927

Claim:
A semiconductor laser device, comprising: a p-type clad layer and an n-type clad layer; a p-side guide layer and an n-side guide layer interposed between the p-type clad layer and the n-type clad layer; and an active layer interposed between the p-side guide layer and the n-side guide layer, the active layer including at least two quantum well layers and a barrier layer interposed between the quantum well layers adjoining to each other, each of the p-type clad layer and the n-type clad layer being formed of a (Al x1 Ga (1-x1) ) 0.51 In 0.49 P layer (0≦x1≦1), each of the p-side guide layer, the n-side guide layer and the barrier layer being formed of a Al x2 Ga (1-x2) As layer (0≦x2≦1), each of the quantum well layers being formed of a GaAs (1-x3) P x3 layer (0≦x3≦1).