Patent ID: 7329894
Filing Date: 2008-02-12
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser device comprising: a semiconductor substrate; and a semiconductor multilayer structure formed on the semiconductor substrate, wherein the multilayer structure has at least one set of semiconductor layers including a first semiconductor layer, a second semiconductor layer, and a third semiconductor layer positioned midway between both the first and second layers; and wherein, in said at least one set of the semiconductor layers, said third semiconductor layer is a Type II superlattice layer that includes first and second kinds of semiconductor layers stacked alternately, the first kind of semiconductor layers having a gradually decreased thickness, and the second of semiconductor layers having an identical thickness; when an energy position of a conduction band is viewed as energy barrier for electrons, an energy position of a conduction band of the first semiconductor layer (E when an energy position of a valence band is viewed as energy barrier for holes, an energy position of a valence band of the first semiconductor layer (E